Hertel K007290AS Spiral Point Sti Tap M10x1.5 3-flute Hss

Product Description

The HERTEL K007290AS is a spiral point STI tap designed for threading M10 x 1.5 metric coarse threads in pre-drilled Screw Thread Insert (STI) oversized holes. Built from high-speed steel (HSS) with a bright, uncoated finish, this plug-chamfer tap is suited for through-hole tapping operations where the spiral point pushes chips forward ahead of the cutting action. It features 3 flutes and a D3 thread limit, with an overall length of 3.375 inches. Machinists, tool and die makers, and maintenance technicians use this tap for creating STI threads that accept thread-repair inserts in ferrous and non-ferrous materials.

This tap is used in machine shop, maintenance, repair, and overhaul (MRO) environments where thread repair via helical coil inserts or similar STI-compatible inserts is required. The plug chamfer (3-5 thread lead) makes it appropriate for through-hole applications. It is suitable for use in machine tapping operations on lathes, mills, and CNC equipment, as well as hand tapping with a tap handle in field repair scenarios.

Key Features

• M10 x 1.5 metric coarse STI thread form for use with thread-repair insert systems
• Spiral point geometry pushes chips ahead of the tap, reducing clogging in through-hole applications
• High-speed steel construction provides durability across a range of workpiece materials
• D3 thread limit for controlled fit tolerance in tapped holes
• Plug chamfer with 3 flutes balances cutting speed and chip clearance
• Bright, uncoated finish suitable for use with standard cutting fluids

Compatibility

Designed as an STI metric coarse tap for use with M10 x 1.5 thread-repair insert systems in through-hole applications. Compatible with standard tap handles, tapping heads, and machine tapping chucks that accept the shank dimensions of this tool.

Installation Notes

This tap should be installed by a qualified machinist or skilled tradesperson familiar with thread-cutting procedures. Always use the correct STI oversized drill before tapping, and apply an appropriate cutting fluid for the workpiece material to extend tap life and improve thread quality. Secure the workpiece firmly before tapping and back the tap out periodically to clear chips when hand tapping. Never force a tap against resistance, as HSS taps are brittle and can snap if torque is excessive.