Heli-coil 4937-125 Metric Thread Repair Kit 48 Inserts

Product Description

The HELI-COIL 4937-125 is a metric thread repair kit designed to restore damaged or stripped internal threads in metal components. The kit covers four common metric thread sizes ranging from M5 x 0.80 up to M10 x 1.25, making it a practical solution for shops and field technicians working across a range of fastener sizes. Each kit ships with 48 stainless steel helical inserts along with the drill, tap, and installation tool required to complete the repair without sourcing additional tooling. This kit is used by mechanics, machinists, and trade professionals performing thread restoration on engine components, housings, brackets, and other threaded assemblies. Total kit weight is 4 pounds.

This thread repair kit is suited for automotive, HVAC, plumbing, and general mechanical applications where metric fastener threads have been cross-threaded, pulled out, or otherwise compromised. The four included thread sizes cover a wide range of common metric hardware: M5 x 0.80, M6 x 1.00, M8 x 1.25, and M10 x 1.25. Technicians working on equipment with metric fastener standards will find this kit applicable across residential and light commercial service environments. It is a bench-ready solution requiring no additional insert tooling for the sizes included.

Key Features

• Covers four metric thread sizes: M5 x 0.80, M6 x 1.00, M8 x 1.25, and M10 x 1.25
• Includes 48 threaded inserts total across all four sizes
• Kit includes drill, tap, and installation tool - no separate tooling required
• Metric thread standard for compatibility with metric fastener systems
• Helical insert design restores threads to original holding strength
• Self-contained kit format suited for shop or field use

Compatibility

Designed for metric thread repair applications requiring internal thread sizes from M5 x 0.80 through M10 x 1.25. Suitable for use in any metal component that accepts metric fasteners within the included size range.

Installation Notes

Thread repair should be performed by a qualified mechanic or machinist familiar with drill sizing, tapping procedure, and insert installation technique. Always de-energize or lock out the equipment being serviced before beginning thread repair work. Use the included drill and tap in the correct sequence before driving inserts with the provided installation tool. Tang removal tool is not included with this kit; confirm whether the insert style used requires tang removal before beginning the job.