{"title":"Taps, Dies \u0026 Die Nuts","description":"\u003cp\u003eLooking for high-quality taps, dies \u0026amp; die nuts? At Duchy Fasteners, we understand the importance of reliable components for your projects. That's why we offer a carefully selected range of taps, dies \u0026amp; die nuts designed to meet the demands of trade professionals and DIY enthusiasts across the UK.\u003c\/p\u003e\u003cp\u003eThese versatile taps, dies \u0026amp; die nuts are essential for a wide array of tasks, from construction and engineering to general maintenance and specialized fabrication. Whether you're securing structures, assembling components, or undertaking repairs, our taps, dies \u0026amp; die nuts provide the strength and durability you need.\u003c\/p\u003e\u003cp\u003eOur selection includes various types, such as 1\"bsw (2\") Rh HSS Split Die, 7\/8\"bsw (2\") Rh HSS Split Die, 3\/4\"bsw (1 1\/2\") Rh HSS Split Die. You'll find options in robust steel, corrosion-resistant stainless steel, and other specialized materials, ensuring optimal performance for every application.\u003c\/p\u003e\u003cp\u003eChoosing Duchy Fasteners means opting for quality, reliability, and exceptional service. We pride ourselves on supplying taps, dies \u0026amp; die nuts that stand the test of time, backed by fast UK delivery and competitive trade prices. Our expert team is always on hand to help you find the perfect taps, dies \u0026amp; die nuts for your specific needs.\u003c\/p\u003e","products":[{"product_id":"1-die-stock-handle-ds2","title":"1\" Die Stock Handle DS2","description":"\u003cp\u003e1\" DIE STOCK HANDLE DS2 is designed for reliable performance in various tasks. Whether you're cutting, drilling, or securing, 1\" DIE STOCK HANDLE DS2 ensures superior results. Manufactured with top-quality materials, 1\" DIE STOCK HANDLE DS2 guarantees durability, strength, and precision, making it the ideal choice for professionals and DIY enthusiasts alike.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":50425675350334,"sku":"LTDS025","price":16.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dr24525_png_11787f80-d3b1-4a35-be2a-2c228d0b6a48.png?v=1781532282"},{"product_id":"1-5-16-die-stock-handle-ds3","title":"1 5\/16\" Die Stock Handle DS3","description":"\u003cp\u003e1 5\/16\" DIE STOCK HANDLE DS3 is designed for reliable performance in various tasks. Whether you're cutting, drilling, or securing, 1 5\/16\" DIE STOCK HANDLE DS3 ensures superior results. Manufactured with top-quality materials, 1 5\/16\" DIE STOCK HANDLE DS3 guarantees durability, strength, and precision, making it the ideal choice for professionals and DIY enthusiasts alike.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":50425675546942,"sku":"LTDS035","price":23.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dr24525_png_bda7b900-c180-4017-89af-f1f6e5b51e7f.png?v=1780405872"},{"product_id":"2-die-stock-handle-ds5","title":"2\" Die Stock Handle DS5","description":"\u003cp\u003e2\" DIE STOCK HANDLE DS5 is designed for reliable performance in various tasks. Whether you're cutting, drilling, or securing, 2\" DIE STOCK HANDLE DS5 ensures superior results. Manufactured with top-quality materials, 2\" DIE STOCK HANDLE DS5 guarantees durability, strength, and precision, making it the ideal choice for professionals and DIY enthusiasts alike.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":50425675841854,"sku":"LTDS050","price":45.71,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dr24525_png_7d699d2e-9b6f-4ede-8056-ead4771a0469.png?v=1781532293"},{"product_id":"3-die-stock-handle","title":"3\" Die Stock Handle","description":"\u003cp\u003e3\" DIE STOCK HANDLE is designed for reliable performance in various tasks. Whether you're cutting, drilling, or securing, 3\" DIE STOCK HANDLE ensures superior results. Manufactured with top-quality materials, 3\" DIE STOCK HANDLE guarantees durability, strength, and precision, making it the ideal choice for professionals and DIY enthusiasts alike.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":50425676005694,"sku":"LTDS075","price":128.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dr24525_png_f1ce9a57-fdf3-497f-b432-a0dccdb0b7e8.png?v=1781532307"},{"product_id":"3mm-x-0-5mm-13-16-rh-hss-split-die","title":"3MM x 0.5MM (13\/16) Rh HSS Split Die","description":"\u003cp\u003e3mm x 0.5mm (13\/16) RH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256330715454,"sku":"DIE03","price":24.07,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/product_11786214900030_sq.png?v=1779114200"},{"product_id":"3-5mm-x-0-6-13-16-rh-hss-split-die","title":"3.5MM x 0.6 (13\/16) Rh HSS Split Die","description":"\u003cp\u003e3.5mm X 0.6 (13\/16) RH HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256331698494,"sku":"DIE03.5","price":30.28,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/masonary-nail_png_d91532b2-1a9f-4e03-b851-1a8bbf61496d.png?v=1780406334"},{"product_id":"3mm-1-rh-hss-split-die","title":"3MM (1\") Rh HSS Split Die","description":"\u003cp\u003eThis is a 3 mm right‑hand HSS split die designed for cutting or re‑cutting external metric threads (M3 x 0.50) on bar, rod or stud. Its primary use is producing accurate external threads in manual or light machine operations, and the split design gives a small degree of adjustment so the user can tighten or relax the profile to suit the workpiece or to clean up damaged threads.\u003c\/p\u003e\n\n\u003cp\u003eThe die is ground from M2 high speed steel (HSS) to retain cutting edge hardness and heat resistance. It is supplied with a bright, ground finish and a light protective oil coating to limit corrosion during storage. The tooling conforms to the ISO metric thread form (ISO 68‑1) and is compatible with the ISO 261\/262 standard pitch series; manufacture and tolerances follow recognised metric thread practice such as DIN 13 and ISO 965 where applicable. This is a right‑hand (RH) thread tool intended for external threads and incorporates the standard circular split die form with an adjustment\/locking screw so it can be used in a compatible die holder or stock. For machine use a suitable die head or holder should be used, while hand work is normally performed with a T‑handle die stock.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include small component manufacture, electrical and electronics assembly, instrument making, maintenance and repair work, model engineering and general mechanical workshops. The die cuts conventional M3 coarse metric threads commonly found on fasteners, small assemblies and prototypes.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the wear resistance and edge stability of M2 HSS, the practical adjustability offered by the split design for improved thread fit, and the protective finish which reduces surface corrosion in transit or storage. The die is suitable for use on ferrous and non‑ferrous materials such as mild steel, brass and aluminium; when working stainless steels or harder alloys use appropriate cutting fluid and reduced speed for best tool life.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks split dies across a broad metric range and supplies individual sizes and multi‑packs, plus matching die holders and T‑stocks. If you need alternative sizes, imperial equivalents or full sets, contact our sales team for availability and pack options.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256331862334,"sku":"DIE030100","price":33.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/product_11786214900030_sq_7250002a-d045-44b9-a090-6766d3d33f38.png?v=1781533051"},{"product_id":"4mm-x-0-7-13-16-rh-hss-split-die","title":"4MM x 0.7 (13\/16) Rh HSS Split Die","description":"\u003cp\u003e4mm X 0.7 (13\/16) RH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256332091710,"sku":"DIE04","price":24.07,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_cfe99c25-b7c6-4a18-9aff-613219177e5f.png?v=1781533063"},{"product_id":"4mm-1-rh-hss-split-die","title":"4MM (1\") Rh HSS Split Die","description":"\u003cp\u003eThis is a 4 mm right‑hand (RH) split die manufactured from high speed steel, designed for cutting or restoring external metric threads — typically M4 × 0.7. The split design gives a slight radial adjustment so you can tighten or relax the die in a standard die stock to obtain a close or loose thread fit and to compensate for wear or material differences. Its primary use is on bar, rod or stud material where a clean, accurate external thread is required during fabrication or repair.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from M2 grade high speed steel (HSS), precision ground and heat treated to provide the hardness and toughness needed for repeated cutting operations in mild steel, brass, aluminium and certain plastics when used with appropriate lubrication. The thread form conforms to the ISO metric 60° profile (compatible with DIN 13 \/ ISO 68‑1 nominal forms) and is supplied as a right‑hand thread. The unit is unmounted and intended for use with a standard T‑type or adjustable die stock; the split cut allows controlled adjustment of the effective thread size.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include machine shop maintenance, prototyping, general engineering, instrument making and small‑batch production where restoring or forming external threads is required. It is commonly used in automotive repair, electrical enclosures, bracket manufacture and any situation where M4 fastenings are needed but tapped components are not available.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of an M2 HSS split die are dimensional stability and wear resistance under repeated cutting, with the split feature giving fine control of thread fit. While HSS is not stainless, it offers better corrosion resistance than untreated carbon tool steels; routine oiling after use will prolong life. The die’s compatibility with standard die holders and the ISO metric thread form makes it straightforward to integrate into existing tooling and assembly processes.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners carries a wide range of split dies and matching die stocks in common metric sizes. Items are available individually or in multi‑packs to suit workshop or production requirements; please contact us for specific size and pack availability.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256332583230,"sku":"DIE040100","price":33.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_86ca9d1f-d2f6-4cc2-89ee-acacaee0518c.png?v=1781533075"},{"product_id":"5mm-x-0-8-13-16-rh-hss-split-die","title":"5MM x 0.8 (13\/16) Rh HSS Split Die","description":"\u003cp\u003e5mm x 0.8 (13\/16) RH HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256333762878,"sku":"DIE05","price":24.07,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_5b7e4208-73ce-4930-9bf8-7bb1d31bbea7.png?v=1781533086"},{"product_id":"6mm-x-1-rh-hss-split-die-13-16-dia","title":"6MM x 1 Rh HSS Split Die 13\/16 Dia.","description":"\u003cp\u003eThis product is a 6 mm x 1.0 right‑hand split die manufactured from high speed steel (HSS) and supplied in a 13\/16\" diameter die body. It is used to cut or restore external metric threads (M6 x 1.0) on round bar, studs and shafts, and is intended for use in a compatible die stock or holder that accepts a 13\/16\" die body. The split design allows fine adjustment of the cutting diameter for chasing damaged threads or producing a controlled fit.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from HSS (commonly M2 grade) that has been heat treated and ground to provide a durable cutting edge and good hot hardness for hand and light machine use. The thread form produced is ISO metric (fundamental profile as per ISO 68‑1) with standard M6 pitch. The product is manufactured to metric thread tolerances consistent with ISO 261 \/ ISO 965 and DIN 13 practice for external threads. As a split die it is normally used in a round die holder and secured with the holder’s set screws; no hex head or drive feature is required on the die itself.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include on‑site maintenance and repair, engineering workshops, automotive and motorcycle thread repairs, fabrication shops and general machine shop use where threads must be cut or reconditioned quickly. The HSS construction allows cutting of mild steel, alloy steel, brass, aluminium and other common engineering materials; stainless steels can be chased but require appropriate cutting oils and slower feed.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of this split HSS die are the adjustability of the split body for minor size correction and reconditioning, the wear and heat resistance of HSS (M2) that retains a sharp cutting edge, and broad compatibility with standard metric thread standards and common die holders. Note that HSS is not stainless; the die should be oiled after use and stored dry to minimise corrosion.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks this split die in individual pieces and in multi‑pack options where available, and we carry a full range of metric and imperial dies and die holders to suit most workshop requirements. Please contact us for specific size availability and pack quantities. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256334319934,"sku":"DIE06","price":26.33,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dowel_pin-sc_png_bbe72355-3b99-4361-a25e-4d1664bec0f3.png?v=1780406338"},{"product_id":"6mm-x-0-75-13-16-fine-hss-split-die","title":"6MM x 0.75 (13\/16) Fine HSS Split Die","description":"\u003cp\u003eEngineered for accuracy and strength, 6mm x 0.75 (13\/16) FINE HSS SPLIT DIE delivers outstanding results in various applications. Its robust construction guarantees resistance to wear, making it a great addition to any toolkit. Designed for ease of use, it enhances productivity across multiple tasks.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256334680382,"sku":"DIE06075","price":33.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_550674f0-cd54-4676-a54b-c80559693e75.png?v=1781533098"},{"product_id":"7mm-x-1-1-rh-hss-split-die","title":"7MM x 1 (1\") Rh HSS Split Die","description":"\u003cp\u003e7mm x 1 (1\") RH HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256335073598,"sku":"DIE070100","price":37.56,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_99552ed5-d0c8-4bdc-ab00-877ee9e81874.png?v=1781533110"},{"product_id":"8mm-x-1-25-1-rh-hss-split-die","title":"8MM x 1.25 (1\") Rh HSS Split Die","description":"\u003cp\u003eThis product is an 8 mm × 1.25 right‑hand split die manufactured from high speed steel (HSS), designed for cutting, repairing and restoring external metric threads on bars, rods and studs. Its primary use is producing M8 × 1.25 threads to the ISO metric thread form for general engineering and maintenance work, and it is intended for use in a compatible round die stock (T‑handle or lever die holder).\u003c\/p\u003e\n\n\u003cp\u003eThe die is made from M2 grade high speed steel, ground to a sharp cutting profile and supplied in the common round split‑die format with a circumferential split and an adjustment screw to permit slight size correction or thread chasing. Thread form and pitch conform to ISO metric thread standards (ISO 68‑1 \/ ISO 965) and are compatible with DIN 13 and BS 3643 metric tolerances; the tool produces a right‑hand M8 thread with 1.25 mm pitch. As a cutting tool rather than a coated fastener, the finish is a bright ground HSS surface; cutting lubricant is recommended when machining tougher materials.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include machine shop production, maintenance and repair, automotive and cycle workshop work, agricultural machinery overhaul and general fabrication where external metric threads need to be cut or refreshed. The HSS construction gives the die high hot‑hardness and wear resistance compared with carbon tool steels, making it suitable for frequent use on mild steel, brass, aluminium and some stainless steels when used with appropriate coolant. It is not a stainless product itself, so for corrosive environments a specialist coated or stainless option should be considered.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of this HSS split die are its wear resistance and ability to be adjusted to chase damaged threads, its compatibility with standard die stocks and holders, and its conformance to recognised metric thread standards for interchangeability. Because the split design permits incremental tightening, it is especially useful for restoring threads without oversize cutting. For high corrosion resistance or specific tolerance classes, alternative finishes and tolerance grades are available.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners holds a broad range of metric split dies and related tools. We stock common sizes and pitches in single pieces and multi‑packs and can supply compatible die stocks and cutting fluids to suit workshop requirements. If you need different sizes or tighter tolerances, please contact us for availability. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256335532350,"sku":"DIE08","price":26.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/greasenip-str_png_9f682a91-160b-4f9a-9a7d-022cddc2c899.png?v=1780406341"},{"product_id":"8mm-x-0-75-1-fine-hss-split-die","title":"8MM x 0.75 (1\") Fine HSS Split Die","description":"\u003cp\u003e8mm x 0.75 (1\") FINE HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256335761726,"sku":"DIE08075","price":45.65,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_f77eb79e-5801-4b4b-b4d2-3cd59afe2bc4.png?v=1781533123"},{"product_id":"8mm-x-1-1-fine-hss-split-die","title":"8MM x 1 (1\") Fine HSS Split Die","description":"\u003cp\u003eThis product is an M8 × 1.0 fine-pitch external split die made from high speed steel (HSS), intended for cutting or repairing M8 threads with a 1.0 mm pitch on round bars, rods and shafts. The split design allows the die to be slightly adjusted in the die holder to produce a closer or freer fit, making it ideal for finishing or restoring threads where control over fit is required.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 grade high-speed steel, hardened and tempered and supplied with a precision-ground finish for crisp thread form. It cuts ISO metric threads to the ISO metric thread form (ISO 68‑1) and is produced to general ISO\/DIN\/BS dimensional practice for metric external dies. The thread type is external (M8 × 1.0 fine), the tool is a round split die with an axial split and clamping screw groove so it is used in a standard split-die holder rather than having a head or drive feature of its own.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair work on machinery, fabrication of precision assemblies in automotive and instrumentation, and engineering workshops where fine pitch is required for better clamping and vibration resistance. The die performs well on mild steel, alloy steels, brass, bronze and aluminium; stainless steels should be cut with slower speeds and appropriate lubricant. It is commonly used in mechanical engineering, plant maintenance, motor vehicle repair and prototyping.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the wear resistance and edge retention of M2 HSS, which sustains cutting performance over longer runs than carbon tool steel dies, and the split feature which allows slight size adjustment to achieve the correct thread clearance. While HSS itself offers limited corrosion resistance, dies may be supplied with a protective black-oxide finish or used with corrosion-inhibiting lubricants to improve durability in humid environments. The die is compatible with standard split-die holders and works alongside standard taps for matched internal\/external thread assemblies.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks this M8 × 1 split die across common sizes and in single and multi-pack options; complementary die holders and cutting oils are also available to complete the threading set.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256337531198,"sku":"DIE081","price":39.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/product-8mm-x-1-15209-90dg-grease-nipple_59c5da86-9741-40e8-8a76-3293f9811361.webp?v=1780406345"},{"product_id":"9mm-x-1-25-1-rh-hss-split-die","title":"9MM x 1.25 (1\") Rh HSS Split Die","description":"\u003cp\u003eThis product is a 9 mm x 1.25 right‑hand split die manufactured from high speed steel (HSS) and intended for cutting or repairing external metric threads on bars, studs and bolts. Its primary use is to form or restore M9 × 1.25 threads (1.25 mm pitch), commonly found where a finer-than-coarse metric thread is required, using a standard die stock holder.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from M2 grade high speed steel, providing the hardness and hot‑work resistance required for cutting operations. The thread form conforms to the ISO metric 60° profile and is compatible with the common ISO\/DIN thread standards (ISO 261 \/ ISO 965 and DIN 13). The part is right‑hand cut and supplied as a split circular die with an approximately 1\" outside diameter to suit standard round die stocks; the split design allows slight adjustment of the finished thread by tightening or loosening the clamp screw. A black oxide finish reduces surface friction and offers limited corrosion protection and improved chip flow during cutting.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include threading and re‑threading external threads in engineering workshops, vehicle maintenance, agricultural and industrial machinery repair, prototyping and small‑batch manufacture. The HSS material makes this die suitable for cutting threads in mild steel, alloy steels, non‑ferrous metals such as aluminium and brass, and plastics; when cutting stainless steels it is recommended to use appropriate lubricant and reduced cutting speeds to avoid work hardening.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of this HSS split die include sustained cutting hardness at elevated temperatures, good wear resistance compared with carbon steel dies, and the adjustable split that allows finer control of thread fit for repair work. Compatibility with standard die stocks and adherence to ISO\/DIN metric thread forms simplifies use across workshop and maintenance environments.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of metric HSS split dies in common sizes and pack quantities. Please contact us for available sizes, single units or multi‑pack options and to confirm compatibility with your die stock.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256337924414,"sku":"DIE09","price":33.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_7daa301b-c99b-45b5-849e-19da23efb4d0.png?v=1781533135"},{"product_id":"10mm-x-1-5-1-rh-hss-split-die","title":"10MM x 1.5 (1\") Rh HSS Split Die","description":"\u003cp\u003eThis is an M10 x 1.5 right‑hand split die manufactured in high speed steel (HSS) for cutting or restoring external ISO metric threads on round bar and rod. The primary use is to form or clean M10 coarse threads with a 1.5 mm pitch using a compatible die stock; the split design allows fine adjustment of the effective cutting diameter for repair or tolerance correction.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from M2 HSS (high speed steel) and is precision ground for accurate flank form and pitch. The tool is supplied with a protective coating to resist light corrosion in storage; as with all HSS tools it should be kept oiled when not in use. The thread conforms to ISO metric thread form and is suitable for components made to ISO\/DIN\/BS metric standards (ISO 68‑1 \/ ISO 261 \/ ISO 965 and DIN 13 \/ BS 3643 thread forms). Thread type is M10 × 1.5 mm, right‑hand. As a round split die it is intended for use in a 1\" die stock holder (round die holder) with conventional two‑handled die stock tools rather than a screwdriver drive.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include cutting new external threads on mild steel, aluminium, brass and many stainless alloys, repairing damaged or corroded threads on maintenance tasks, and sizing one‑off components in engineering workshops. Common industries using this product are mechanical engineering, plant maintenance, automotive repair, fabrication and general workshop fitting. For tougher or hardened materials use appropriate lubrication and take light cuts; HSS is wear‑resistant but not intended for hardened steel above typical tempering limits.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the HSS split die are durability and edge retention from the M2 steel, the ability to adjust the cut via the split to correct minor runout or produce a slightly tighter or freer fit, and compatibility with standard metric thread gauges and die holders. The rust‑protective finish gives some corrosion resistance in storage and handling, while the precision ground form ensures consistent thread geometry when used with correct tooling and technique.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of metric split dies, in single sizes and sets, along with compatible die stocks and accessories. Sizes and pack quantities vary; please contact us for available diameters, pitches and pack options. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256338022718,"sku":"DIE10","price":26.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/product-10mm-x-1-5-90deg-grease-nipple_37c4fc41-00dc-44f1-b114-91880f29a0c0.webp?v=1780406349"},{"product_id":"10mm-x-1-1-fine-hss-split-die","title":"10MM x 1 (1\") Fine HSS Split Die","description":"\u003cp\u003eThis is a 10 mm x 1.0 metric fine split die manufactured from high speed steel (HSS) and intended for cutting, cleaning or repairing external M10 × 1.0 threads. The split design allows slight size adjustment and improved thread run‑in compared with solid dies, making it suitable for restoring damaged threads or producing fine pitch metric threads by hand or in a die holder on light machinery.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from M2 high speed steel, hardened and precision ground to deliver a long tool life and consistent cutting geometry. The nominal thread form is ISO metric fine (M10 × 1.0) conforming to ISO metric thread profiles (referenced to ISO 965\/DIN 13 and BS 3643 conventions), and it is supplied as a round split die with an axial slot and locking screw for controlled adjustment. The finish is a ground bright surface; the HSS substrate gives excellent wear and heat resistance (typical hardness after heat treatment is approximately 60–62 HRC), making it effective in alloy steels and other tougher materials.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include producing or repairing fine metric threads on studs, shafts and cylindrical components in automotive, instrumentation, aerospace maintenance, toolroom work and general engineering workshops. It is suitable for use on mild steel, alloy steel, stainless steel (with care and correct lubricant), aluminium and non‑ferrous metals when using appropriate cutting fluid and correct feed. The die is intended for use in a standard hand die stock for manual work or in a compatible automatic die holder for light machine work; it is not intended for heavy industrial high‑speed threading without appropriate holders and lubrication.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the wear and heat resistance of M2 HSS for extended cutting life, the adjustability of the split design to fine‑tune fit or repair oversize threads, and compatibility with ISO\/DIN\/BS metric fine thread standards to ensure interchangeability with mating nuts and bolts. For environments where corrosion resistance is essential, consider black oxide or TiN coated variants or stainless‑steel die options; routine maintenance will reduce surface rust on bright HSS tools.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of dies and tap \u0026amp; die accessories, including metric and imperial sizes, available individually or in multipacks. For availability of other sizes, holders and repair kits please contact Duchy Fasteners or view our current stock list.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256338153790,"sku":"DIE101","price":38.44,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_99f8e44f-d51e-4923-b9b8-d12d1054bd4a.png?v=1781616665"},{"product_id":"10mm-x-1-25-1-fine-hss-split-die","title":"10MM x 1.25 (1\") Fine HSS Split Die","description":"\u003cp\u003e10mm x 1.25 (1\") FINE HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256339464510,"sku":"DIE10125","price":35.59,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_4f108a1c-b965-4690-ac7a-7d2ee6057906.png?v=1781616658"},{"product_id":"11mm-x-1-5-1-5-16-rh-hss-split-die","title":"11MM x 1.5 (1 5\/16) Rh HSS Split Die","description":"\u003cp\u003eThis product is an M11 x 1.5 right-hand split die, a hand and machine threading tool used to cut or restore external metric threads with an 11 mm nominal diameter and a 1.5 mm pitch. The split design allows a small axial adjustment of the cutting diameter by tightening or loosening the split screw, making it suitable for cleaning damaged threads or producing accurate external threads on bar stock and studs.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS), offering good hot hardness and wear resistance compared with carbon tool steels. It is supplied with a precision ground cutting face and a bright finish; variants with a black oxide coating are often available to provide additional corrosion resistance and reduced light reflection during use. The thread form conforms to common metric standards (ISO 261 general-purpose metric thread form and ISO 965-1 for tolerance classes) and is compatible with DIN 13 thread profiles for metric coarse threads. This is a right-hand (RH) thread die suitable for standard M11 × 1.5 threads.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair of machinery, automotive stud and bolt restoration, fabrication of bespoke fasteners, and on-site threading in engineering workshops. Industries that commonly use M11 × 1.5 split dies include plant maintenance, rail and transport workshops, mechanical engineering, and general metal fabrication where non-standard or worn fasteners need renewing without replacing the parent component.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the HSS split die include sustained cutting performance at elevated temperatures, long tool life on common engineering materials (steel, stainless steel in lighter sections, brass, aluminium), and the ability to fine-tune thread fit via the split adjustment. The die is compatible with standard round die stocks \/ holders and can be used with light machine equipment where appropriate. For best results use appropriate cutting lubricant and advance the die with controlled pressure to preserve thread form and tool life.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a comprehensive range of hand and machine dies. This M11 × 1.5 split die is available as a single item and we hold a broad selection of metric sizes for repair and production work; please contact us for pack sizes and availability.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256339759422,"sku":"DIE11","price":51.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_d9468616-12db-4045-8740-ba2b9da8af92.png?v=1781533147"},{"product_id":"12mm-x-1-75-1-5-16-rh-hss-split-die","title":"12MM x 1.75 (1.5\/16\") Rh HSS Split Die","description":"\u003cp\u003e12MM X 1.75 (1.5\/16\") RH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256339923262,"sku":"DIE12","price":45.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_ce039db5-b9d5-44dc-8c4f-b3de2ed2dcc1.png?v=1781616651"},{"product_id":"12mm-x-1-75-1-o-d-rh-hss-split-die","title":"12MM x 1.75 ( 1\" Outer Diameter ) Rh HSS Split Die","description":"\u003cp\u003eThis is a 12 mm x 1.75 right‑hand (RH) split die manufactured from high speed steel (HSS) for cutting and repairing external metric threads. It is designed to produce standard ISO metric threads (M12 × 1.75) on round bar, studs and shafts, and is suitable for hand use in a die stock or light machine work in a die holder. The die has an approximately 1\" outer diameter to suit common die holders and chucks.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from M2 grade high speed steel with a ground cutting profile, the split construction allows the two halves to be adjusted slightly to alter thread fit or to compensate for wear. The die cuts the ISO metric thread form in accordance with ISO 261\/965 and the commonly used DIN 13 profile, producing a right‑hand, coarse‑pitch M12 thread. The tool is supplied in a bright\/ground finish; some variants are supplied with a light protective coating such as black oxide to reduce surface corrosion during storage.\u003c\/p\u003e\n\n\u003cp\u003eThe HSS material and heat treatment give the die greater hot hardness and toughness than carbon steel dies, making it appropriate for cutting mild and alloy steels, stainless steels, brass, bronze and aluminium. It is an excellent choice for workshop maintenance, engineering fabrication, agricultural and automotive repairs where occasional or intermittent external threading is required. For best results use an appropriate cutting lubricant, a die stock or holder that centres the die, and advance in small increments with periodic backing off to break chips.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the split HSS die include improved corrosion resistance when coated, higher wear resistance and cutting life from the M2 HSS grade, and adjustable thread fit through the split design allowing fine tuning between a looser or tighter fit. It is compatible with standard die holders and the metric fastener system, making it straightforward to integrate into existing tooling sets.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks split dies across the metric range, available as individual pieces and in boxed sets. Sizes typically cover the common metric series (for example M3 to M24) and are supplied in single units or multi‑pack sets to suit workshops and maintenance teams.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256340480318,"sku":"DIE120100","price":23.54,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_3641f129-f700-467d-8d77-bb5b6c33e981.png?v=1781616644"},{"product_id":"12mm-x-1-75-1-5-16-lh-hss-split-die","title":"12MM x 1.75 (1 5\/16) Lh HSS Split Die","description":"\u003cp\u003e12MM X 1.75 (1 5\/16) LH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256342348094,"sku":"DIE120150L","price":71.93,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_4d334280-25ed-4d0c-ae3a-9fc7308f60b6.png?v=1781616636"},{"product_id":"12mm-x-1-25-1-5-16-fine-hss-split-die","title":"12MM x 1.25 (1 5\/16) Fine HSS Split Die","description":"\u003cp\u003eThis 12 mm x 1.25 (1 5\/16) Fine HSS Split Die is a hand and machine threading tool designed to cut or restore external ISO metric fine-pitch threads on rods, studs and shafts. Its primary use is to form M12 × 1.25 external threads where a finer pitch is required than the coarse M12 × 1.75 option, and the split design allows adjustment of thread engagement for accurate fit and easy release from the workpiece.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from M2 high speed steel (HSS) and through-hardened, the die features ground cutting faces for consistent thread profile and a corrosion-resistant black oxide finish to reduce surface rust. The thread profile conforms to the ISO metric thread form and is compatible with ISO 261\/965 and BS 3643 specifications; it is also consistent with the DIN 13 metric thread series. The die produces a standard ISO external thread (metric fine pitch), suitable for mating with standard nuts or tapped holes. The split configuration permits slight tightening or easing of the cut by compressing or separating the die in a standard round die stock (outer diameter approximately 1 5\/16\" to suit common stocks).\u003c\/p\u003e\n\n\u003cp\u003eUse this die in general engineering, automotive repair, agricultural machinery maintenance, plant and equipment refurbishment, and fabrication shops where controlled fine-pitch threads are required. It can be used for hand threading with a die stock or in low-speed machine applications when securely clamped and properly lubricated. The HSS material offers good hot hardness and toughness, allowing re-sharpening when worn and reliable performance when cutting mild steel, alloy steel and stainless steels (with appropriate cutting fluid).\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include precise metric fine-pitch thread form, the adjustability of the split die for achieving the desired fit and clearing minor damage, material strength and re-sharpenability of M2 HSS, and the protective black oxide finish for extended tool life. The die is compatible with standard M12 threaded components manufactured to ISO\/BS\/DIN metric standards.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a broad range of taps and dies in metric and imperial sizes, available as individual dies and in sets, and supplied in various pack quantities to suit workshop and production requirements. Contact us for specific size availability and pack options. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256342511934,"sku":"DIE12125","price":56.73,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_9abea165-959f-45b3-8a96-fd48628a97dd.png?v=1781616628"},{"product_id":"14mm-x-2-1-5-16-rh-hss-split-die","title":"14MM x 2 (1 5\/16) Rh HSS Split Die","description":"\u003cp\u003e14mm x 2 (1 5\/16) RH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256343036222,"sku":"DIE14","price":51.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/stp-scol_png_6ef47e99-c90f-477b-8485-af2a7cbe5a6b.png?v=1780406377"},{"product_id":"14mm-x-1-75-1-1-2-rh-hss-split-die","title":"14MM x 1.75(1 1\/2) Rh * HSS Split Die","description":"\u003cp\u003eThis 14 mm x 1.75 RH HSS split die is an external threading tool designed to cut or repair M14 x 1.75 metric threads on shafts, studs and rods. Its primary use is forming ISO metric threads (right-hand) for general purpose fastening and repair work where accurate, repeatable external threads are required.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS), hardened and ground for long tool life and consistent cutting performance. The split design features an axial slot and an adjustment screw that allows fine control of thread fit, making it easier to correct minor oversize\/undersize conditions or to clean corroded threads. The tool is finished with a dark oxide coating to improve corrosion resistance and reduce built-up material; it is intended for use with cutting fluid when working on ferrous materials.\u003c\/p\u003e\n\n\u003cp\u003eThread geometry conforms to the ISO metric thread form (ISO 68-1) and is intended to produce threads compatible with ISO and BS metric fasteners, including those to BS 3643. For general workshop use the die will typically produce threads within ISO 965 tolerance ranges suitable for mating with standard 6g\/6H metric fasteners when used with the correct die holder and technique.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair engineering, automotive and agricultural machinery workshops, fabrication and metalworking shops, and general plant maintenance where studding or shaft repair is required. The M2 HSS construction makes this die suitable for cutting steels, alloy steels and stainless steels (with appropriate lubricant), and also works well on softer metals such as brass and aluminium.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the split HSS die include adjustable thread fit for precision mating, improved chip clearance compared with solid dies, and the wear resistance and edge retention of M2 high speed steel. The oxide finish gives added protection against corrosion during storage and intermittent use. The die is compatible with standard round die stocks (holders) sized for metric split dies.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of split dies and die sets in metric sizes, available individually or in kits and in a variety of pack quantities to suit one-off repairs through to workshop spares.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256344019262,"sku":"DIE140175","price":59.23,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_26aa7e64-00d7-4332-909e-032bfc4638c7.png?v=1781616621"},{"product_id":"14mm-x1-00-1-5-16-hss-split-die-fine","title":"14MM X1.00 (1 5\/16) HSS Split Die Fine","description":"\u003cp\u003eEngineered for accuracy and strength, 14mm x1.00 (1 5\/16) HSS SPLIT DIE FINE delivers outstanding results in various applications. Its robust construction guarantees resistance to wear, making it a great addition to any toolkit. Designed for ease of use, it enhances productivity across multiple tasks.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256344740158,"sku":"DIE141","price":52.42,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_3fcb870e-39cd-4a1d-bf6d-896351153d10.png?v=1781533159"},{"product_id":"m14-x-1-5-1-5-16-o-d-fine-split-die","title":"M14 x 1.5MM (1.5\/16\" Outer Diameter) Fine Split Die","description":"\u003cp\u003eEngineered for accuracy and strength, M14 X 1.5 (1.5\/16\" O\/D) FINE SPLIT DIE delivers outstanding results in various applications. Its robust construction guarantees resistance to wear, making it a great addition to any toolkit. Designed for ease of use, it enhances productivity across multiple tasks.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256345395518,"sku":"DIE1415","price":55.16,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_58c1382d-bbe8-4c44-b4c3-1f2a3f8db25c.png?v=1753886965"},{"product_id":"16mm-x-2-1-1-2-rh-hss-split-die","title":"16MM x 2 (1 1\/2) Rh HSS Split Die","description":"\u003cp\u003eThis is a 16 mm x 2 (1 1\/2) right‑hand split die manufactured from M2 high‑speed steel (HSS) for cutting or repairing external metric threads. The primary use is to form or restore M16 × 2.0 (ISO metric) threads on shafts, studs and bar stock, either by hand using a die stock or in light machine applications where a controlled, adjustable cut is required.\u003c\/p\u003e\n\n\u003cp\u003eThe die conforms to the ISO metric thread form (ISO 68‑1) and the preferred metric sizes described in ISO 261\/BS 3643; it is compatible with the tolerances and fits commonly specified under ISO 965 and DIN 13. Material grade M2 HSS provides superior hardness and wear resistance versus carbon tool steels, and the die is supplied with a bright ground finish for sharp cutting edges and accurate thread geometry. As a round, split type die the component features a longitudinal slit that allows the cutting diameter to be slightly adjusted via the die holder clamping screw, improving fit for repair work or compensating for tool wear. The product is a right‑hand thread; drive is by standard round die stock (die holder) rather than a spanner or power drive, and it is suitable for manual or light powered use as advised by the holder manufacturer.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair in automotive, agricultural machinery, plant engineering, fabrication and general engineering workshops where metric M16 threads are required. The split die is particularly useful for re‑threading damaged shafts, producing threads on turned components and making minor size corrections without changing chamfers or mating parts.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the long tool life and edge retention of M2 HSS (strength grade and wear resistance), the adjustability and chip clearance afforded by the split design, and broad compatibility with standard die stocks and ISO metric fasteners. Note that plain HSS is not stainless; for enhanced corrosion resistance consider dies with black oxide or TiN coatings or store the tool dry and lightly oiled.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of metric split dies and die holders across common sizes; items are available individually or in multi‑pack options—please contact us for size availability and pack quantities. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256345657662,"sku":"DIE16","price":57.47,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/dowel_pin-sc_png_59ace59d-7e8e-4c4f-8f14-44b7bd572e26.png?v=1780406385"},{"product_id":"16mm-x-1-1-1-2-hss-split-die-fine","title":"16MM x 1 (1 1\/2) HSS Split Die Fine","description":"\u003cp\u003eThis is a 16 mm x 1 mm HSS split die designed for cutting external M16 × 1 metric fine threads by hand or in suitable die-holders on light machines. Its primary use is to restore damaged threads or to cut precise external fine threads on bar, rod and tubular components where the 1 mm pitch is required instead of the coarser M16 × 2 series.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS), precision ground to a true thread form and supplied as a split (adjustable) round die to allow for minor size correction and improved chip clearance. It produces ISO metric fine thread form compliant with ISO thread geometry (ISO 68-1) and is compatible with ISO\/BS metric thread series (ISO 261 \/ BS 3643). The product is presented in the common round die format to fit standard die stocks and holders; the split feature is secured and adjusted by the set screw on the die body.\u003c\/p\u003e\n\n\u003cp\u003eM2 HSS gives the die good red hardness and wear resistance compared with carbon steels, making it suitable for cutting mild steel, alloy steels, free-cutting steels, brass, copper and aluminium. The precision ground finish ensures accurate mating with standard nuts and tapped holes. For improved corrosion resistance a black oxide finish is often applied to HSS dies; please check the specific product listing for finish details.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair workshops, automotive thread repair, plant and machinery refurbishment, fabrication and mechanical engineering where fine-pitch M16 thread is required. The split design helps when cutting in poor access or when slight size adjustment is necessary to achieve a correct fit with existing components.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the strength and hot hardness of M2 HSS for extended tool life, the ability to adjust the cut via the split to control thread fit, and compatibility with ISO\/BS metric thread standards for interchangeability. Duchy Fasteners stocks this M16 × 1 HSS split die alongside a broad range of metric HSS split dies in common sizes, available singly or in sets; please refer to our catalogue for available sizes and pack options.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256346018110,"sku":"DIE161","price":66.21,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_778f2076-f94d-4d34-a160-b75847184374.png?v=1781616613"},{"product_id":"16mm-x-1-5-1-1-2-hss-split-die-fine","title":"16MM x 1.5 (1 1\/2) HSS Split Die Fine","description":"\u003cp\u003eThis 16 mm x 1.5 HSS split die is a hand and machine cutting tool designed to cut, restore and size M16 fine‑pitch (1.5 mm) ISO metric threads on round bar, rod and tubular components. Its primary use is the production or repair of right‑hand M16×1.5 threads where a finer pitch is required for improved clamping control, vibration resistance and increased thread engagement compared with the M16 coarse pitch.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from high speed steel (HSS), commonly M2 or an equivalent grade, heat‑treated and precision ground to retain cutting hardness and wear resistance. The tool carries a black oxide finish to help reduce corrosion and minimise galling during cutting. It is a round, split die with a through‑split and clamping screw, giving a small adjustment range for cutting clearance and for fine tuning thread fit. The cutter geometry includes chamfered lead‑in faces for reliable start and chip control. This product is intended for use with standard die stocks (T‑handle holders or ratchet die holders) rather than direct machine spindle mounting.\u003c\/p\u003e\n\n\u003cp\u003eThe 16×1.5 split die produces ISO metric thread form compatible with ISO 68‑1 and ISO 965 series tolerances; the format and construction conform to recognised round split die practice such as DIN 223 where applicable. It cuts right‑hand threads and is suitable for use in low to medium production or maintenance environments.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include automotive and steering components, hydraulic and pneumatic fittings, precision engineering, plant maintenance and fabrication work where fine‑pitch M16 threads are specified. The HSS material and the split design make the die suitable for use on mild and alloy steels, stainless steels (with appropriate lubrication and chip control), aluminium and non‑ferrous materials.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include improved wear resistance and heat tolerance from the HSS material, corrosion protection from the black oxide finish, and adjustable thread fit courtesy of the split design. The die is compatible with standard M16 nuts and bolts cut to ISO metric thread standards and is useful for both production and on‑site repair.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners holds a wide range of HSS split dies and matching die stocks in metric sizes; this item is available as a single unit and we also supply multi‑pack options and complementary tooling—please contact us for specific sizes and pack quantities.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256346739006,"sku":"DIE1615","price":69.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_615fcaad-d54d-40bc-9953-6807c6844077.png?v=1781616606"},{"product_id":"18mm-x-2-5-2-hss-split-die-rh","title":"18MM x 2.5 (2\") HSS Split Die Rh","description":"\u003cp\u003eThis product is an 18 mm x 2.5 mm right‑hand split die manufactured from HSS for cutting or restoring external ISO metric threads on round bar and studs. Its primary use is cutting M18 × 2.5 external threads and chasing damaged threads where a controlled fit is required; the split design allows a slight adjustment of cut to suit the workpiece or to compensate for wear.\u003c\/p\u003e\n\n\u003cp\u003eThe die body is manufactured from M2 high‑speed steel (HSS), heat treated for cutting durability and finished with a black oxide coating to reduce light surface corrosion and help chip evacuation. It produces ISO metric thread form (ISO 68‑1) with a standard pitch of 2.5 mm and is compatible with ISO 261\/ISO 965 and BS 3643 thread specifications; typical external tolerance class produced is 6g when set in a standard die stock. This is a right‑hand thread die intended for use in hand die stocks or compatible machine die heads; the split aperture and adjusting screw permit fine setting of thread engagement. Suitable cutting fluids should be used, particularly when machining stainless steels or hardened materials.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include on‑site maintenance and repair of bolts, studs and shafts, small‑batch production of external threads, and recovery of damaged threads in automotive, plant maintenance, fabrication and mechanical engineering workshops. The die is also used in rail, marine and oil‑and‑gas maintenance where reinstating a reliable threaded connection is required. It is suitable for use on mild and alloy steels, stainless steels (with appropriate lubricant), brass, aluminium and many technical plastics.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the split HSS die are its adjustability to tailor thread fit, the wear resistance and edge retention of M2 HSS for extended service life, and compliance with international metric thread standards for interchangeability. The black oxide finish aids corrosion resistance compared with untreated tool steel, though it is not a stainless product so storage and lubrication are recommended for long life.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a comprehensive range of metric HSS split dies in popular sizes and supplies them as single pieces or in multi‑pack quantities to suit workshop and production requirements. If you need other sizes or matching die stocks, please contact our sales team. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256346935614,"sku":"DIE18","price":72.36,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_8ad31975-7d05-410e-8660-20d5ba85f8bb.png?v=1781533171"},{"product_id":"18mm-x-1-0-1-1-2-hss-split-die","title":"18MM x 1.0(1 1\/2) HSS Split Die","description":"\u003cp\u003eThis is an 18 mm × 1.0 HSS split die, a circular external thread-cutting tool intended for producing or repairing M18 × 1.0 metric fine threads on shafts and studs. The split die is used in a hand-operated die stock or compatible machine die holder to cut new threads, chase damaged threads, or restore thread form to worn components where a fine-pitch M18 is required.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS) and is precision ground to size. It is heat-treated and tempered to provide a durable cutting edge and long tool life. The product conforms to ISO metric thread form standards (ISO 68‑1 for thread profile and ISO 965‑1 for tolerances) and is suitable for threads made to DIN 13 and BS 3643 specifications. The 18 mm diameter with 1.0 mm pitch is a fine-pitch metric external thread (M18 × 1.0). The split configuration allows controlled adjustment of the thread depth when clamped in a standard die stock, enabling light trimming or tighter fitment. The die has a bright ground finish; it is a tool steel product and should be stored oiled to minimise surface corrosion.\u003c\/p\u003e\n\n\u003cp\u003eBecause it is made from M2 HSS, this split die is suitable for cutting threads in mild steel, medium alloy steels, stainless steels (work-hardened grades may need slow feeds and cutting fluid), aluminium, brass and many engineering plastics. It is commonly used in engineering and maintenance workshops, automotive and hydraulic fitting repairs, precision instrument manufacture, and general mechanical fabrication where fine-pitch M18 fastenings are required.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the wear resistance and edge retention of M2 HSS, the fine-pitch accuracy compatible with ISO\/DIN\/BS thread standards, and the adjustability of the split design which aids reconditioning and on-site repair work. The die will not provide corrosion protection itself, so use appropriate lubricants during cutting and protect the tool in storage.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks split dies across the metric range; this item is available individually and in multi-packs, and we also supply compatible die stocks and cutting fluids. Contact us for availability of other sizes, alternative pitches or bulk requirements.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256347033918,"sku":"DIE181","price":158.55,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_bbbc1d7c-c5e2-48bb-8e95-642d806b6c97.png?v=1781533183"},{"product_id":"18mm-x-1-5-1-1-2-hss-split-die","title":"18MM x 1.5 (1 1\/2) HSS Split Die","description":"\u003cp\u003eThis is an 18 mm x 1.5 HSS split die designed for cutting and restoring external ISO metric threads (M18 × 1.5). Its primary use is to form or repair M18 external threads on studs, bolts and bar stock where a hand or machine-held split die is required to provide a controlled, adjustable cut.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS), hardened and ground to maintain cutting edge durability and heat resistance. The die is split to allow a small amount of radial adjustment for fine tuning thread fit and for compensating minor wear or repair work. The thread form complies with ISO metric thread geometry (ISO 68-1) and standard pitches (ISO 261 \/ DIN 13 \/ BS 3643), producing the commonly-used M18 × 1.5 metric coarse thread. The die typically has a ground face finish with an oxidised (blackened) outer surface to reduce friction and offer modest corrosion protection during storage and use.\u003c\/p\u003e\n\n\u003cp\u003eThe die is intended for use in a compatible die stock holder (hand die stock) or a suitable machine die holder, and it requires cutting lubricant for best results. Because it is HSS, it will hold form and cutting ability better than carbon steel dies when working with mild steel, stainless steels, aluminium and non-ferrous alloys; however, correct lubricant and cutting speed should be chosen for tougher materials.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair of machinery, fabrication and installation of plant equipment, automotive and agricultural repairs, and on-site thread reinstatement in engineering workshops and construction. The adjustable split design makes it particularly useful where a close fit is required or where threads need slight resizing during refurbishment.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the wear resistance and temperature tolerance of M2 HSS for extended life, the adjustability of the split design to control fit and compensate for wear, and compatibility with standard M18 fasteners and die stocks. Duchy Fasteners holds a wide stock range of HSS split dies and die sets in metric sizes including M18 × 1.5, available as single dies or in multi-size packs, along with matching die holders and accessories.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256347164990,"sku":"DIE1815","price":64.38,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_eab308c4-c3be-4ee2-b048-29fe45c10116.png?v=1781533194"},{"product_id":"20mm-x-2-5-1-1-2-hss-split-die","title":"20MM x 2.5 (1 1\/2) HSS Split Die","description":"\u003cp\u003e20mm x 2.5 (1 1\/2) HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256347296062,"sku":"DIE20","price":61.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/tubeinsert-sq_png_44db6f12-6518-4e05-a369-65bf1089749e.png?v=1780406396"},{"product_id":"m20-x-2-0-hss-split-die-fine-1-1-2","title":"M20 x 2.0MM HSS Split Die Fine (1.1\/2\")","description":"\u003cp\u003eThe M20 x 2.0mm HSS Split Die Fine (1 1\/2\") is a round, adjustable cutting die for producing or restoring external M20 fine-pitch metric threads (20mm diameter, 2.0mm pitch). It is intended for use in a compatible round die stock and is primarily used to cut or repair threads on shafts, studs and rods where an ISO metric fine thread form is required.\u003c\/p\u003e\n\n\u003cp\u003eThis die is manufactured from high speed steel (HSS, typically M2 grade) and is heat-treated then ground to produce an accurate thread profile. The tool has a split-body configuration with an adjustment screw that permits slight size alteration and controlled thread fit, allowing users to open the split for a looser fit or close it for a tighter tolerance. The finish is a ground, bright\/ polished surface to aid chip flow and ensure consistent thread geometry. The thread form conforms to ISO metric thread dimensions (ISO 261\/965) and is compatible with BS 3643; the product design follows round split die profile conventions (DIN 223) for hand dies.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include on-site repair of damaged external threads, cutting new threads on turned bar or studs, and finishing threads where fine pitch is specified. Industries that commonly use this die include engineering workshops, plant maintenance, heavy fabrication, automotive service, rail and marine maintenance, and general industrial assembly. For best results use with an appropriate cutting oil and a matched die stock; the split design also facilitates thread-cleaning and minor re-sizing without full re-machining.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of this HSS split die are wear resistance and edge retention from the HSS material, the ability to adjust thread fit via the split body and screw, and full compatibility with ISO metric M20 x 2.0 thread standards. While HSS itself offers good cutting life, corrosion resistance is limited compared with stainless options, so storage and use with suitable lubricants is advised.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of split and solid metric dies from small to large diameters. The M20 x 2.0mm split die is available as a single item and we supply related die stocks, spare adjustment screws and multi-size sets; contact us for specific pack sizes and availability. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256347656510,"sku":"DIE202","price":54.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_29301e3b-4ded-477d-81b9-33cfa5e97893.png?v=1753886959"},{"product_id":"m30-x-3-5-3-hss-split-die","title":"M30 x 3.5MM (3\") HSS Split Die","description":"\u003cp\u003eThis M30 x 3.5mm (3\") HSS split die is a round cutting die designed to cut or restore external metric threads of size M30 with a 3.5mm pitch. It is intended for use in a hand die stock or compatible machine die holder to form or repair threads on bars, studs and shafts where an accurate ISO metric thread is required. The “split” feature allows the die to be slightly adjusted for tighter or looser fit and to compensate for wear.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from High Speed Steel (commonly M2 HSS) and is ground to a precision thread profile. It is supplied with a dark oxide finish to give basic corrosion protection and reduce friction during cutting. The thread form conforms to ISO metric thread geometry and is suitable for parts made to ISO 261 \/ ISO 965-1 tolerances; it is also compatible with DIN 13 and BS 3643 metric thread systems. The die produces a standard right-hand M30 x 3.5 thread and is sized to suit a 3\" (approx. 75 mm) round die holder or machine die adapter.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include mechanical engineering, plant maintenance, fabrication, automotive and agricultural repair where large-diameter metric threads are required or where damaged threads must be restored on-site. The tool is effective on mild and medium carbon steels, alloy steels, stainless steels (with correct cutting practice), aluminium and other non-ferrous materials. For harder or stainless materials, use cutting oil and reduced feed to extend tool life and achieve clean threads.\u003c\/p\u003e\n\n\u003cp\u003eThe key benefits of this HSS split die are its wear resistance and maintained cutting edge at elevated temperatures thanks to the M2 HSS material, and the split design which allows controlled thread fit adjustment and simplified re-threading of damaged studs. The black oxide finish offers limited corrosion resistance and reduces galling; the die is compatible with standard 3\" die stocks and machine holders so it integrates easily into workshop tooling sets.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a comprehensive range of taps and dies including metric and Whitworth sizes; this M30 x 3.5mm split die is available individually or in multi-packs and is held in a variety of size options to suit both hand and machine use. Contact us for current stock levels and pack quantities. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256348737854,"sku":"DIE30","price":221.9,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_a9fe15ef-76af-4950-8956-0086f8e1763d.png?v=1753886954"},{"product_id":"1-4-20unc-13-16-rh-hss-split-die","title":"1\/4-20unc (13\/16) Rh HSS Split Die","description":"\u003cp\u003eThis product is a 1\/4-20 UNC (13\/16in) right-hand split die manufactured from high speed steel (HSS) and designed to cut or restore external Unified National Coarse (UNC) threads on bolts, studs and shafts. The die produces 1\/4 inch major diameter threads at 20 threads per inch, with the split construction allowing a small adjustment to fine-tune fit or to chase damaged threads.\u003c\/p\u003e\n\n\u003cp\u003eManufactured from M2 grade HSS and supplied with a bright ground finish, the die conforms to the Unified thread form as specified in the Unified Thread Standard (ASME B1.1). It is a round split die with an axial slot and clamping screw arrangement so it can be tightened or relaxed in a standard 13\/16in die stock. The right-hand (RH) thread orientation is for conventional right-hand fastening applications.\u003c\/p\u003e\n\n\u003cp\u003eTypical uses include on-site maintenance, machine repair, plant engineering, automotive restoration and fabrication work where imperial fasteners are present. This die is suitable for cutting and re-cutting threads in a wide range of materials including mild and alloy steels, non-ferrous metals and many stainless steels when used with the appropriate cutting lubricant. It is commonly used by engineers, maintenance technicians, vehicle workshops and marine engineers who need to restore damaged threads or create new external threads to UNC specification.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of the HSS split die include wear resistance and elevated hot hardness compared with carbon steel dies, the ability to adjust thread tolerance via the split adjustment, and straightforward compatibility with standard die stocks and handles. While HSS is not stainless, the bright ground finish offers good dimensional stability; use of cutting oil and suitable storage will protect the tool against corrosion.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks this 1\/4-20 UNC split die individually and as part of imperial die sets. Sizes and pack formats cover common UN series threads; please contact us for availability of single dies, refill packs or full die \u0026amp; stock sets. Our part code for this item is DIEC0025. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256349163838,"sku":"DIEC0025","price":33.51,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_07725d96-f769-4332-b448-8bc156dcb3ec.png?v=1780406400"},{"product_id":"5-16-18unc-1-rh-hss-split-die","title":"5\/16-18unc (1\") Rh HSS Split Die","description":"\u003cp\u003eThis is a 5\/16-18 UNC right‑hand split round die, 1\" diameter, designed for cutting or restoring external Unified Coarse (UNC) threads on rods, studs and shafts. Its primary use is to produce or refurbish 5\/16\" diameter, 18 threads‑per‑inch external threads where a standard UNC profile is required, and the split design allows fine adjustment of the finished thread form for either free‑running or tighter fits.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from high‑speed steel (HSS), typically M2 grade, giving good hot‑hardness and edge retention for general workshop use. The body is supplied in a bright, ground finish and is supplied as a single‑split die with an adjustment screw to change the effective cutting diameter. Thread form and pitch conform to the Unified thread specification (5\/16‑18 UNC, 18 tpi) as defined in ANSI\/ASME B1.1, producing a standard right‑hand, external thread to mate with corresponding UNC bolts and nuts. The die requires a compatible 1\" round die stock (holder) for safe, controlled cutting and drive; it is not intended for use in powered die stocks unless specifically rated for such use by the holder manufacturer.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include general engineering workshops, maintenance and repair operations, automotive and agricultural machinery repair, fabrication and plant maintenance where imperial UNC fasteners are used. The tool is suitable for machining mild steel, free‑cutting steels, brass, aluminium and plastics; it is not recommended for hardened steels without specialist grades or coatings.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the wear resistance and thermal stability of M2 HSS for reliable cutting performance, the adjustability of the split design to correct minor thread distortion or to achieve specific fit classes, and compatibility with standard UNC fasteners. Note that bright HSS is not inherently corrosion‑resistant; light oiling after use and dry storage will reduce rusting. For improved corrosion protection, black oxide or other coated versions may be used where available.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of hand and machine dies, including split and solid types in common imperial and metric sizes, die stocks and holders. This item is sold under code DIEC0031 and is available individually or in assorted packs to suit workshop and maintenance requirements. Contact Duchy Fasteners for available sizes and pack quantities. \u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256349491518,"sku":"DIEC0031","price":39.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_a1622c53-513e-441c-b430-4ad472cf6554.png?v=1780406404"},{"product_id":"3-8-16-unc-1-o-d-rh-hss-split-die","title":"3\/8\"-16 UNC (1\" Outer Diameter) Rh HSS Split Die","description":"\u003cp\u003e3\/8\"-16 UNC (1\" O\/D) RH HSS SPLIT DIE is a high-quality addition to any toolkit, providing excellent durability and functionality. Whether in engineering, carpentry, or maintenance work, it guarantees ease of use and reliability. Suitable for various demanding tasks, ensuring professional-grade results.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256349884734,"sku":"DIEC0037","price":39.62,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/Nut-bzp_png_e42d17a5-723e-462f-b680-cdf1af22c58a.png?v=1780406408"},{"product_id":"7-16-14unc-1-5-16-rh-hss-split-die","title":"7\/16-14unc (1 5\/16) Rh HSS Split Die","description":"\u003cp\u003e7\/16-14UNC (1 5\/16) RH HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256350277950,"sku":"DIEC0043","price":57.79,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_ad2e788e-cf4f-4d07-8c00-41eddc81aa38.png?v=1780406412"},{"product_id":"7-16unc-1-5-16-lefthand-hss-split-die","title":"7\/16\"unc (1 5\/16) Lefthand HSS Split Die","description":"\u003cp\u003eEngineered for accuracy and strength, 7\/16\"UNC (1 5\/16) LEFTHAND HSS SPLIT DIE delivers outstanding results in various applications. Its robust construction guarantees resistance to wear, making it a great addition to any toolkit. Designed for ease of use, it enhances productivity across multiple tasks.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256350900542,"sku":"DIEC0043L","price":75.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_c1f27220-6e5e-4cd2-83b4-d04602e343bb.png?v=1780406416"},{"product_id":"9-16unc-1-5-16-rh-hss-split-die","title":"9\/16\"unc (1 5\/16) Rh HSS Split Die","description":"\u003cp\u003eThis product is a 9\/16\" UNC right‑hand split die designed for cutting and restoring Unified National Coarse (UNC) threads on shafts, studs and bolts. The die provides a convenient, adjustable thread‑cutting solution: the split design allows a small amount of radial adjustment so you can tighten or loosen the fit to suit repair or new‑cut threads, and it is intended for use with a compatible die stock.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from high speed steel (HSS), typically M2 grade, which gives the cutting edges good hot hardness and wear resistance compared with carbon tool steels. The cutting faces are ground to the UNC profile to meet the Unified thread form and supplied with a dark oxide finish that offers modest corrosion protection and reduces glare when machining. The thread form is UNC (Unified National Coarse) to ANSI\/ASME B1.1; it will match UN coarse fasteners and is compatible in assemblies that specify UNC thread form under BS\/ISO\/ANSI common practice. The item is a right‑hand (RH) die in the nominal 9\/16\" size; the die body is produced in a 1 5\/16\" body form to fit standard die stocks with the corresponding across‑flats size.\u003c\/p\u003e\n\n\u003cp\u003eThese HSS split dies are used widely in maintenance, engineering and fabrication environments where on‑site thread repair or one‑off production of UNC threads is required. Typical industries include automotive and vehicle repair, industrial plant maintenance, oil and gas, agricultural machinery and general mechanical engineering. The HSS material and ground cutting form make it suitable for cutting in mild and alloy steels, free‑cutting stainless steels (with suitable lubricant), and non‑ferrous materials, though lubrication and correct cutting speed are important for stainless applications.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the ability to adjust thread fit via the split clamp screw, long tool life from M2 HSS, and direct compatibility with existing UNC fasteners and standard die stocks. The black oxide finish helps resist corrosion in workshop environments while the ground profile ensures consistent thread geometry. Duchy Fasteners stocks these split dies in common imperial sizes, supplied individually and in boxed packs for trade and workshop use; contact us for available sizes and pack quantities.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256351818046,"sku":"DIEC0056","price":78.3,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_fb9a4562-9355-4f39-b355-981ade9fd081.png?v=1781533206"},{"product_id":"5-8-11unc-1-1-2-rh-hss-split-die","title":"5\/8-11unc (1 1\/2) Rh HSS Split Die","description":"\u003cp\u003eThis is a 5\/8-11 UNC right‑hand split die manufactured from High Speed Steel (commonly M2), designed for cutting and restoring external unified coarse threads on shafts, studs and rods. Its primary use is to cut new external threads or to chase and repair damaged threads on imperial (inch) components, using a compatible die stock or machine die holder.\u003c\/p\u003e\n\n\u003cp\u003eThe die produces 5\/8‑11 UNC threads in the Unified Thread Standard (per ASME\/ANSI B1.1), typically yielding a standard Class 2A external fit. The body is a round split‑ring die 1½\" in diameter overall length, with a machined chamfer to aid start and a through‑cutting geometry to evacuate swarf. The split design includes an adjustment screw to close or open the cutting face slightly, allowing fine‑tuning of thread engagement and easier correction of undersize or damaged threads.\u003c\/p\u003e\n\n\u003cp\u003eMade from M2 HSS, the material retains hardness at elevated cutting temperatures and gives good wear resistance compared with carbon tool steels, making it suitable for hand and light machine use. The die is supplied in a bright ground finish which aids cutting accuracy and visual inspection of the thread form. As an imperial UNC die, it is compatible with standard die stocks and holders and will match mating internal threads machined to the Unified standard.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include general engineering, maintenance and repair, automotive and agricultural maintenance, fabrication shops, and plant maintenance where imperial threaded repair or prototyping is required. The split die is particularly useful for on‑site repair work where returning components to service quickly is important, and for batch production where small adjustments to thread size are needed without changing tooling.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the HSS material’s wear and heat resistance for longer tool life, the split\/adjustable design for restoring or fine‑adjusting threads, and conformity to the UNC\/ASME B1.1 thread form for broad compatibility with imperial fasteners. Duchy Fasteners stocks this 5\/8‑11 UNC split die in single items and multi‑pack options, and carries a full range of alternative sizes and accessories including die stocks and holders.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256352538942,"sku":"DIEC0062","price":67.85,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_3d1fce4b-47cd-4484-8cb4-7be3b6541d20.png?v=1780406420"},{"product_id":"3-4-10-unc-hss-split-die-rh-1-1-2","title":"3\/4-10 UNC HSS Split Die Rh (1 1\/2\")","description":"\u003cp\u003eThis is a 3\/4\"-10 UNC right-hand split die manufactured from high-speed steel (HSS M2) and intended for cutting and repairing external Unified Coarse (UNC) threads on studs, bar and bolts. Its primary use is to create or restore 3\/4\" diameter, 10 threads-per-inch external threads where a robust imperial coarse thread form is required; it is designed for hand use in a die stock and can also be used in compatible machine die holders where appropriate speeds and feeds are observed.\u003c\/p\u003e\n\n\u003cp\u003eThe tool is supplied as a 1½\" round split die body with an adjustable split and clamp screw to allow slight size correction and easy removal of the die from the workpiece. Thread form is 3\/4\"-10 UNC (Unified National Coarse), right hand, 10 TPI, conforming to the UNC profile as defined by ANSI\/ASME B1.1; the die body follows common DIN\/ISO dimensional conventions for round split dies. Material grade is M2 high-speed steel for good hardness retention and wear resistance, with a black oxide finish to reduce friction and give additional mild corrosion protection. Cutters are ground to the correct thread profile and supplied with a centre chamfer to aid starting. For stainless and tougher alloys use appropriate cutting fluid and reduced feed to prolong tool life.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include general engineering, plant maintenance, heavy fabrication, agricultural and construction machinery repairs, automotive restoration and site re-threading where UNC fasteners are used. The split design makes this die especially useful for repairing damaged external threads, sizing slightly out-of-tolerance studs and finishing threads on turned bar where a small adjustment to the cut is required.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits are the durability and heat resistance of M2 HSS, the adjustability of the split die for precise sizing and repair work, and direct compatibility with standard 3\/4\"-10 UNC bolts and studs (ANSI\/ASME B1.1). The black oxide finish reduces corrosion and improves chip flow compared with untreated tooling.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners holds a comprehensive range of HSS split dies and die stocks in imperial sizes; this item is available individually or in multi-packs—please contact us for current stock sizes and pack quantities. Product code DIEC0075.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256352702782,"sku":"DIEC0075","price":67.85,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/boltimp-zp_png_bbb3fddf-a176-4240-92f8-3eae8843deb9.png?v=1780406424"},{"product_id":"7-8unc-2-rh-hss-split-die","title":"7\/8\"unc (2\") Rh HSS Split Die","description":"\u003cp\u003e7\/8\"UNC (2\") RH HSS SPLIT DIE is designed for precision and durability, ideal for professional and home use. Crafted from high-quality materials, it ensures long-lasting performance in demanding environments. Perfect for mechanics, engineers, and DIY enthusiasts looking for reliability and efficiency.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256353063230,"sku":"DIEC0087","price":100.78,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/setimp-sc_png_bef68d5e-2373-4725-a524-f32693c034db.png?v=1780406428"},{"product_id":"no4-unc-13-16-rh-hss-split-die","title":"No4-unc (13\/16) Rh HSS Split Die","description":"\u003cp\u003eThis is a No.4‑UNC (13\/16) right‑hand split die manufactured from high speed steel (HSS) for cutting or restoring external Unified coarse (UNC) threads. Its primary use is forming or repairing external threads on bolts, studs and bar stock, either by hand in a die stock or fitted in a machine die holder for light production or maintenance work.\u003c\/p\u003e\n\n\u003cp\u003eThe die is produced from M2 high speed steel with a precision ground cutting face and a protective black oxide finish to reduce flash corrosion and improve chip evacuation. It is a split (adjustable) round die, sized and marked No.4‑UNC (13\/16) RH, and conforms to the Unified Thread Standard (UNC) tolerances as defined in ANSI\/ASME B1.1, making it compatible with standard UNC fasteners. The split design permits slight size adjustment for cutting or cleaning up worn threads and allows for easier removal. The die is intended for use in a standard round die stock or compatible machine holder; there is no separate head or drive — the tool is clamped in the holder and rotated to form the thread.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include workshop maintenance, assembly and repair of electrical enclosures, instrumentation, light engineering components, timber and furniture fasteners, and where imperial UNC fasteners are used. Industries that commonly use split dies include mechanical engineering, automotive maintenance, marine repair, HVAC installation and general fabrication, particularly where occasional thread repair or mixed material work is required.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits of this M2 HSS split die are its hardness retention and wear resistance at elevated cutting temperatures, the ability to adjust the cut for reconditioning threads, and broad material compatibility: it will cut or clean threads in mild steels, alloy steels, brass, bronze, aluminium and many plastics (avoid hardened steels above approximately HRC 60). The black oxide finish gives modest corrosion protection and helps reduce galling during use; always use appropriate cutting fluid for best results.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a comprehensive range of HSS split dies and die stocks across imperial and metric sizes. This item is available in single pieces and small multi‑packs — please contact us for current sizes, pack quantities and availability.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256353227070,"sku":"DIEC04","price":42.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_0c09aa77-fea0-4114-8819-c2345446b8c7.png?v=1753886946"},{"product_id":"no6-unc-13-16-rh-hss-split-die","title":"No6-unc (13\/16) Rh HSS Split Die","description":"\u003cp\u003eThis No.6–UNC (13\/16) RH HSS split die is an adjustable external thread cutting tool intended for forming or repairing 1\/4\" class UNC fine\/coarse (No.6) right‑hand threads on rods, studs and bolts. The split design allows a controlled closure or opening of the die to obtain a close or free running fit, making it suitable for thread restoration, workshop maintenance and small‑batch production where precise thread fit is required.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from M2 high speed steel (HSS) and is supplied with a machined working face and a protective black oxide finish to reduce surface corrosion and ease chip evacuation. The thread form is Unified National Coarse (UNC) in accordance with ANSI\/ASME B1.1 and the tool is produced to typical industry tolerances for interchangeability with standard imperial fasteners. This is a right‑hand external thread die (RH) intended for use in a split die holder or appropriate machine die stock; there is no head or drive profile as found on powered taps, the die is secured by the holder’s clamping screws.\u003c\/p\u003e\n\n\u003cp\u003eThe split die is designed with entry chamfers to start threads cleanly and with full cutting flutes for chip clearance. M2 HSS gives significant wear resistance and hot hardness compared with carbon steel dies, allowing reliable cutting of mild and medium carbon steels, aluminium, brass and many stainless steels in typical repair and workshop situations. For hardened materials beyond recommended limits consider ground HSS or carbide tooling.\u003c\/p\u003e\n\n\u003cp\u003eTypical applications include maintenance and repair engineering, automotive and motorcycle rethreading, electrical and instrumentation assembly, marine refit where imperial threads are retained, and general engineering where UNC threaded components are used. Key benefits are the adjustability of the split die for achieving a desired running fit, the durability and temperature resistance of M2 HSS, and compatibility with standard UNC fasteners for interchangeability.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks a wide range of imperial and metric dies and taps including individual split dies and complete sets. This No.6–UNC split die is available as a single item and in boxed options; please contact us for pack quantities and complementary die holders.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256353554750,"sku":"DIEC06","price":42.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_05d2e556-c6fb-478a-ad9f-d5200b18775a.png?v=1753886945"},{"product_id":"no8-unc-13-16-rh-hss-split-die","title":"No8-unc (13\/16) Rh HSS Split Die","description":"\u003cp\u003eThis product is a No.8‑UNC (8‑32) right‑hand split die designed for cutting and repairing external UNC threads on rod, bar and bolt stock. The die body measures 13\/16\" across and is a round split die intended for use in hand die stocks or machine die holders where controlled, external thread formation or restoration is required.\u003c\/p\u003e\n\n\u003cp\u003eThe die is manufactured from high speed steel (HSS), typically M2 grade, heat‑treated and ground to a precise thread form to retain hardness and cutting edge integrity under heavy use. The thread form is UNC (Unified Coarse), compliant with the Unified thread form as defined by ANSI\/ASME B1.1; the nominal thread is No.8 (8‑32 UNC), right‑hand. The split construction gives a small adjustment range to ease setting for repair work and to compensate for minor wear. A light protective finish (black oxide) is applied to resist corrosion during storage and service; note HSS is a tool steel and not stainless, so use light oil or rust inhibitor for long term protection if required.\u003c\/p\u003e\n\n\u003cp\u003eThis split die is suited to workshop and on‑site use in maintenance, fabrication and repair environments. Typical applications include repairing damaged threads on bolts and studs, cutting threads on new shaft stock for prototypes, and producing replacement fasteners in engineering, automotive, marine and plant maintenance. HSS material provides the toughness and red hardness required for cutting mild steel, low alloy steels and some stainless steels (use appropriate cutting fluid), as well as softer materials such as brass and aluminium.\u003c\/p\u003e\n\n\u003cp\u003eKey benefits include the wear resistance and heat tolerance of M2 HSS for extended tool life, the adjustability of the split design for precise fit and repair, and compatibility with standard UNC fasteners and die stocks. The die’s 13\/16\" body diameter matches common round die holders, making substitution and tooling straightforward in mixed imperial workshops.\u003c\/p\u003e\n\n\u003cp\u003eDuchy Fasteners stocks this No.8‑UNC split die individually and as part of imperial die sets. We carry a broad range of HSS split dies in common imperial sizes and pack quantities suitable for trade and workshop use—please contact us for specific size availability and pack options.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"Default Title","offer_id":51256354177342,"sku":"DIEC08","price":42.15,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/files\/splitdie_png_26899a67-8c47-49e1-ac13-b7b8f9387241.png?v=1753886944"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/3183\/5198\/collections\/dies_die_nuts.jpg?v=1779451515","url":"https:\/\/duchyfasteners.co.uk\/collections\/dies-dienuts.oembed?page=5","provider":"DuchyFasteners","version":"1.0","type":"link"}