Heli-coil 4763-2.2 Spiral Point Sti Tap M2.2x0.45

Product Description

The HELI-COIL 4763-2.2 is a spiral point STI tap designed to cut threads for Heli-Coil insert installation in M2.2 x 0.45 metric coarse applications. Made from high-speed steel with a bright, uncoated finish, this plug-chamfer tap drives chips forward during cutting, making it suited for through-hole tapping operations. It measures 1.875 inches overall length with a 0.5625-inch thread length, a D2 thread limit, and a 5H class of fit. Licensed machinists, toolroom technicians, and precision assembly professionals use this tap when preparing threaded inserts in small-diameter metric fastener applications.

This tap is used to prepare holes for Heli-Coil wire thread inserts in M2.2 x 0.45 metric coarse threads. It is appropriate for light-duty precision work in metals where insert-reinforced threads are required, such as aerospace components, electronics housings, and small engine or instrument assemblies. The plug chamfer makes it well-suited for through-hole applications where chip evacuation in the cutting direction is acceptable. With 2 flutes and an STI metric coarse thread standard, it fits tightly defined insert-prep workflows.

Key Features

• STI metric coarse thread form sized for Heli-Coil insert preparation
• Spiral point geometry drives chips forward, ideal for through-hole tapping
• High-speed steel construction provides durability across a range of metals
• Plug chamfer for progressive thread engagement at entry
• D2 thread limit and 5H class of fit for precise insert compatibility
• Bright, uncoated finish - no coating buildup to affect close tolerances

Compatibility

Designed for use with Heli-Coil wire thread insert systems requiring an M2.2 x 0.45 metric coarse STI-tapped hole prior to insert installation.

Installation Notes

This tap is installed by a machinist or toolroom technician using a standard tap wrench or machine tapping setup. The workpiece should be secured and the appropriate STI tap drill size used before tapping to achieve correct minor diameter. Use cutting fluid suitable for the workpiece material to extend tap life and improve thread quality. Inspect the tapped hole for correct thread form before installing the Heli-Coil insert.