Hertel K007257AS Hand Sti Tap M5x0.8 Metric Coarse Plug Chamfer

Product Description

The HERTEL K007257AS is a hand STI tap designed for cutting M5 x 0.8 metric coarse threads in thread repair applications. STI taps cut oversized threads sized to accept Heli-Coil style wire thread inserts, restoring stripped or damaged threads to full load-bearing strength. This tap features a plug chamfer with 3 to 5 leading threads, which eases starting and works well in through-holes or holes with adequate clearance below the thread depth. Manufactured from high-speed steel with a bright uncoated finish, it delivers consistent cutting performance in a range of workpiece materials. Overall length is 2.5 inches. It is used by machinists, maintenance technicians, and trade professionals performing thread repair in the field or at a bench.

This tap is suited for thread repair and insert installation in maintenance, repair, and overhaul work across mechanical, HVAC, plumbing, and general industrial applications. The M5 x 0.8 metric coarse thread form is one of the most common fastener sizes in equipment encountered in trade work. The plug chamfer style makes this tap appropriate for production and repair use where the hole has sufficient depth for the chamfer to clear. It is intended for hand tapping operations and should be used with a proper tap wrench and appropriate cutting fluid for the workpiece material.

Key Features

• STI thread form sized for Heli-Coil style wire thread inserts in M5 x 0.8 metric coarse
• Plug chamfer provides 3 to 5 thread lead-in for easy starting in through-holes and deep blind holes
• 3-flute design balances chip clearance and cutting edge support for hand tapping
• High-speed steel construction provides durability across a range of workpiece materials
• Bright uncoated finish allows direct visual inspection of the cutting edges before and after use
• 2.5-inch overall length fits standard tap wrenches used in field repair work

Compatibility

Designed for use with M5 x 0.8 metric coarse STI thread inserts in standard Heli-Coil style thread repair systems. Suitable for hand tapping operations where a plug chamfer entry is appropriate for the hole configuration.

Installation Notes

Thread repair work should be performed by a qualified machinist or trained maintenance technician following the insert manufacturer's installation procedure. Before tapping, verify the correct STI drill size for M5 x 0.8 has been used to prepare the hole. Use a calibrated tap wrench and apply cutting fluid appropriate for the workpiece material to extend tap life and improve thread finish. Back the tap off periodically to break chips and prevent tap breakage, particularly in blind holes.