Guhring 9010100080000 Spiral Point Sti Tap M8x1.25

Product Description

The GUHRING 9010100080000 is a spiral point STI tap designed for through-hole threading operations in demanding metalworking applications. Built from cobalt high-speed steel and finished with a titanium nitride (TiN) coating, this tap delivers elevated heat and wear resistance compared to standard HSS tooling. It cuts an M8 x 1.25 metric coarse thread to a 6H class of fit with a D4 thread limit, making it suitable for work where dimensional accuracy and thread quality are critical. The plug chamfer style makes it the standard choice for through-hole applications where the tap can run completely through the workpiece.

This tap is suited for threading stainless steel and general steel workpieces in production and maintenance machining environments. The STI (Screw Thread Insert) thread form produces an oversized internal thread intended to accept a helical wire insert, restoring or reinforcing threaded holes. With 3 flutes and a spiral point geometry, chips are pushed ahead of the cutting edge and clear through the exit side of the hole, supporting continuous feed in through-hole setups. Typical users include machinists, toolroom technicians, and maintenance professionals working on precision metal components.

Key Features

• Cobalt HSS construction provides increased hardness and heat resistance for cutting stainless steel and alloy steels
• TiN coating reduces friction and extends tool life in abrasive materials
• Spiral point geometry drives chips forward and out of through-holes for cleaner cuts
• Plug chamfer style optimized for through-hole threading applications
• M8 x 1.25 metric coarse STI thread form produces oversized internal threads for helical wire inserts
• 6H class of fit and D4 thread limit ensure precise dimensional control

Compatibility

Designed as an STI metric coarse tap for use with standard M8 x 1.25 helical wire thread insert systems in through-hole threading applications on stainless steel and steel workpieces.

Installation Notes

This tap should be installed in a rigid tap holder or CNC tapping chuck appropriate for the shank diameter. Power down and secure the workpiece fully before beginning the tapping operation. Use cutting fluid rated for the workpiece material, particularly when tapping stainless steel, to reduce heat buildup and prevent galling. Follow the tap manufacturer and machine tool guidelines for speed and feed — do not force the tap if resistance increases unexpectedly.