Hertel K007261AS Sti Tap M8x1.25 Metric Coarse 4 Flute Hss

Product Description

The HERTEL K007261AS is a hand STI tap designed for cutting M8 x 1.25 metric coarse threads in through-hole and blind-hole applications. STI taps produce oversized threads that accept Heli-Coil or equivalent helical wire thread inserts, restoring damaged threads or reinforcing threads in soft base materials. This tap is ground to a D2 thread limit, carries a 4-flute design with a plug chamfer, and measures 2-15/16 inches overall length. It is manufactured from high-speed steel with a bright uncoated finish. Machinists and maintenance technicians install this tap by hand or with a tap wrench in production and repair environments.

This tap is suited for thread insert work on ferrous and non-ferrous metals, plastics, and composites where an M8 x 1.25 insert seat is required. Typical applications include repair of stripped threads in aluminum castings, engine components, and structural assemblies across automotive, industrial, and general fabrication settings. The plug chamfer makes it appropriate for through-holes and for starting threads in blind holes where some depth is available.

Key Features

• M8 x 1.25 metric coarse thread form sized for STI helical wire insert installation
• D2 thread limit for controlled oversize fit with standard thread inserts
• 4-flute geometry provides balanced cutting and chip clearance
• Plug chamfer allows use in through-holes and deeper blind holes
• High-speed steel construction handles a broad range of workpiece materials
• Bright uncoated finish — 2-15/16 inches overall length for standard tap wrench use

Compatibility

Designed for use with M8 x 1.25 STI helical wire thread inserts in hand-tapping operations. Confirm insert manufacturer specifications for required tap drill size before use.

Installation Notes

This tap is installed by a machinist or maintenance technician using a calibrated tap wrench. Secure the workpiece firmly, use appropriate cutting fluid for the base material, and maintain axial alignment throughout the cut to avoid tap breakage. Clear chips frequently, especially in blind holes. Always confirm the correct tap drill diameter per the insert manufacturer's specification before beginning.