This Tap Set (Taper & Plug) 3mm is a two-piece metric tapping set designed to create M3 × 0.50 internal threads in pre-drilled holes. The set contains a taper (starter) tap with a lead-in chamfer to locate and start the thread cleanly, and a plug (second) tap to continue the thread to full depth and size. It is intended for manual hand-tapping using a tap wrench or T‑handle and for light machine work where hand control is preferred.

The taps are manufactured from M2 high speed steel (HSS) with a bright ground finish for accurate flute form and chip evacuation. The cutting profile and dimensions conform to ISO metric thread form standards (ISO 261/ISO 724) and the individual tap types correspond to recognised DIN designations for taper and plug taps (taper tap to DIN 371 form and plug tap in the DIN 352 family). The thread type is metric coarse M3 with 0.50 mm pitch. Each tap has a square drive shank to suit standard tap wrenches and T‑handles for positive engagement and torque transfer.

Typical applications include producing new internal threads in components and maintenance work on machinery, fabrications and enclosures, small‑parts assembly, electronics housings, model engineering and general workshop repairs. The set is suitable for use in mild steel, aluminium, brass, copper alloys and many engineering plastics; it is not recommended for hardened steels without appropriate specialist tooling.

Key benefits of this set are the use of M2 HSS, which provides good edge toughness and wear resistance for general‑purpose tapping, and the two‑stage approach (taper then plug) that reduces the chance of misalignment and breakage when starting threads. The bright finish allows easy inspection of chip formation; users should apply cutting fluid for improved tool life and swarf control. The taps are compatible with standard British and international tap wrenches and follow ISO/DIN thread form for interchangeability with metric fasteners.

Duchy Fasteners stocks a comprehensive range of metric taps and tap sets, including single taps and multi‑pack options in a variety of sizes. If you need alternative sizes or bulk quantities, please contact us for availability and pack options.