{"title":"A4 316 Cup \u0026 Square Bolts | Marine-Grade Fasteners","description":"\u003cp\u003eDuchy Fasteners offers a comprehensive selection of A4 316 Cup \u0026amp; Square Bolts | Marine-Grade Fasteners. These high-quality fasteners, including A4 316 stainless steel, Cup head, Square head, are engineered for durability and reliability. They are essential for a variety of applications, catering to the needs of trade professionals, construction workers, engineers, and dedicated DIY enthusiasts across the UK. Our products are ideal for secure and lasting fixings in diverse environments, from timber construction to marine applications. We provide a wide range of metric sizes and grades to meet every project requirement. Each item is manufactured to exacting standards, guaranteeing superior performance and corrosion resistance. For all your fastening needs, trust Duchy Fasteners to deliver quality and service. Explore our selection today and benefit from easy buy online UK with free delivery on eligible orders.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCup Square Bolts Carriage Stainless Steel DIN 603 A4\u003c\/li\u003e\n\u003cli\u003eM6 X 25 - CUP SQUARE DIN 603 316 SS X2 A4\u003c\/li\u003e\n\u003cli\u003eM6 X 30 - CUP SQUARE DIN 603 316 STAINLESS STEEL X5 A4\u003c\/li\u003e\n\u003cli\u003eM6 X 20 - CUP SQUARE DIN 603 316 SS X5 A4\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"a4-stainless-steel-cup-square-bolts-din-603","title":"Cup Square Bolts Carriage Stainless Steel DIN 603 A4","description":"\u003cp\u003eThese premium \u003cstrong\u003eA4 (316) Stainless Steel Cup Square Bolts\u003c\/strong\u003e are engineered for high-performance applications where durability and maximum corrosion resistance are essential. Often referred to as carriage bolts, these fasteners feature the classic domed head and square neck design, preventing the bolt from turning once tightened into wood or metal.\u003c\/p\u003e\n\n\u003cp\u003eManufactured to \u003cstrong\u003eDIN 603\u003c\/strong\u003e standards, our cup square bolts are crafted from high-grade 316 stainless steel, making them the ideal choice for marine, coastal, and industrial environments. This material ensures exceptional longevity even when exposed to harsh chemicals, saltwater, and extreme weather conditions.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuperior Corrosion Resistance:\u003c\/strong\u003e The A4-grade stainless steel construction provides ultimate protection against rust and oxidation, outperforming standard steel and A2 stainless alternatives.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecure Fixing:\u003c\/strong\u003e The square shoulder under the cup head grips into the material, allowing for easy tightening from a single side with a nut and washer.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCertified Quality:\u003c\/strong\u003e Produced in accordance with \u003cstrong\u003eDIN 603\u003c\/strong\u003e specifications to ensure consistent dimensions, high tensile strength, and reliable stability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Perfect for structural timber work, fencing, marine construction, and heavy-duty industrial projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhether you are working on a professional construction site or a specialized marine installation, these fasteners provide a secure, aesthetically pleasing finish. Their high-strength properties and resistance to rust make them a dependable solution for projects requiring long-lasting reliability and structural integrity.\u003c\/p\u003e\n\n\u003cp\u003eAvailable in a comprehensive range of diameters and lengths to suit any technical requirement, these bolts ensure a precise fit and superior performance for every application.\u003c\/p\u003e","brand":"Duchy Fasteners","offers":[{"title":"M6 \/ 20mm \/ Full Thread","offer_id":52934623527230,"sku":"A4CUP060020","price":0.21,"currency_code":"GBP","in_stock":true},{"title":"M6 \/ 25mm \/ Full Thread","offer_id":52934623559998,"sku":"A4CUP060025","price":0.36,"currency_code":"GBP","in_stock":true},{"title":"M6 \/ 30mm \/ Full Thread","offer_id":52934623592766,"sku":"A4CUP060030","price":0.27,"currency_code":"GBP","in_stock":true},{"title":"M6 \/ 40mm \/ Full Thread","offer_id":52934623625534,"sku":"A4CUP060040","price":0.45,"currency_code":"GBP","in_stock":true},{"title":"M6 \/ 50mm \/ Full 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