Heli-coil 2087-8 Hand Sti Tap M8 X 1.25 Metric Coarse

Product Description

The HELI-COIL 2087-8 is a hand STI tap designed to cut threads for Heli-Coil wire thread insert installation in M8 x 1.25 metric coarse applications. Manufactured from high speed steel with a bright finish, it features 4 flutes and a plug chamfer for controlled thread engagement from the start. The D3 thread limit and 5H class of fit maintain the oversized thread geometry required for proper insert seating. Thread length is 31.75 mm and overall length is 74.61 mm. Licensed machinists, maintenance technicians, and field service professionals use this tap when restoring damaged threads or creating new insert-ready threads in metal components.

This tap is suited for use in aluminum, magnesium, mild steel, and stainless steel workpieces. It is applied in thread repair operations where a Heli-Coil or compatible wire thread insert will be installed after tapping. Common applications include restoring stripped bolt holes in engine components, machinery housings, and structural assemblies across industrial, automotive, and mechanical maintenance trades. The plug chamfer style makes it appropriate for through-hole tapping as well as deeper blind-hole applications where there is sufficient clearance.

Key Features

• M8 x 1.25 metric coarse thread form with D3 thread limit for insert-ready oversized fit
• 5H class of fit ensures correct geometry for wire thread insert installation
• 4-flute design provides chip clearance and cutting stability across material types
• Plug chamfer allows use in both through-hole and blind-hole configurations
• High speed steel construction handles aluminum, magnesium, mild steel, and stainless steel
• Bright finish with no coating buildup for dimensional consistency

Compatibility

Designed for use with Heli-Coil STI wire thread insert systems in M8 x 1.25 metric coarse thread applications. Compatible material applications include aluminum, magnesium, mild steel, and stainless steel as stated by the manufacturer.

Installation Notes

A licensed machinist or qualified maintenance technician should perform STI tapping operations. Secure the workpiece firmly before tapping and apply appropriate cutting fluid for the base material being threaded. Ensure the tap is aligned perpendicular to the workpiece surface to avoid cross-threading. Follow the insert manufacturer's instructions for drill size, tap depth, and insert installation sequence after tapping is complete.