Hertel K008973AS Tap Set 1/4-20 Unc 4 Flute Hss 3 Piece

Product Description

The HERTEL K008973AS is a 3-piece tap set designed for cutting 1/4-20 UNC internal threads in metal workpieces. Built from high speed steel (HSS) with a bright finish, this set delivers clean thread formation across a range of ferrous and non-ferrous materials. The 4-flute geometry provides strong chip evacuation and consistent thread quality. At 2.5 inches overall length, the taps are sized for standard hand or machine tapping applications. The H1 thread limit holds tight tolerances suitable for 2B and 3B class of fit requirements. Machinists, maintenance technicians, and HVAC or plumbing professionals performing equipment repairs will find this set well-suited for field and shop use.

This tap set is used wherever 1/4-20 UNC threaded holes need to be cut or chased — including equipment enclosures, mounting hardware, conduit fittings, and mechanical assemblies. It is appropriate for both bench work and light machine tapping. The 2B and 3B class of fit coverage makes it a practical choice for general-purpose threading tasks in maintenance and repair environments, including residential and light commercial trade work.

Key Features

• High speed steel construction for durability across common metals
• 4-flute design promotes efficient chip removal during thread cutting
• Bright finish provides a clean surface and visual wear indication
• H1 thread limit supports precise 2B and 3B class of fit tolerances
• 2.5 inches overall length suits standard tapping handles and machines
• 3-piece set covers taper, plug, and bottoming configurations for complete thread jobs

Compatibility

Designed for cutting 1/4-20 UNC internal threads with a 2B or 3B class of fit in standard hand and machine tapping applications.

Installation Notes

Use appropriate cutting fluid when tapping to reduce friction and extend tap life. Always power down and de-energize equipment before tapping into any component on live electrical or mechanical systems. Secure the workpiece firmly before threading to prevent tap breakage. Follow applicable workplace safety standards when operating tapping equipment.