Heli-coil 5403-6 M6x1 Thread Repair Kit 18 Inserts

Product Description

The HELI-COIL 5403-6 is a complete threaded insert thread repair kit designed to restore damaged or stripped M6x1 metric coarse threads in metal components. The kit targets M6x1 thread profiles and includes everything needed to complete the repair in a single package: a drill bit, a tap, an installation tool, a tang removal tool, and 18 wire thread inserts ranging from 6 mm to 12 mm insert length. The primary insert length is 9 mm. Licensed HVAC technicians, plumbers, machinists, and general maintenance professionals use this kit to bring stripped fastener holes back to OEM specification without replacing the host part.

This kit is suited for field and shop repair work on residential and commercial mechanical equipment where M6x1 metric coarse threaded holes have been damaged by overtorquing, cross-threading, or corrosion. Typical applications include repairing threaded bosses in aluminum or steel housings, brackets, manifolds, and mounting flanges found in HVAC equipment, plumbing assemblies, and general mechanical systems. The 18-insert count supports multiple repairs from a single kit. The tang removal tool included is sized 3/16 for clean post-installation break-off.

Key Features

• Complete kit: includes drill bit, tap (part number 2087-6), installation tool (part number 3747-6), tang removal tool, and inserts
• 18 wire thread inserts total: 6 inserts each at three length sizes, ranging from 6 mm to 12 mm
• Primary insert length of 9 mm for standard M6x1 metric coarse repairs
• Metric coarse thread standard for broad compatibility with metric-fastened equipment
• Tang removal tool sized 3/16 for clean insert finishing after installation
• Insert package part number R1084-6 for refill ordering without purchasing full kit

Compatibility

Designed for repairing M6x1 metric coarse threaded holes in metal components across HVAC, plumbing, and general mechanical applications. Inserts are compatible with the HELI-COIL installation tool part number 3747-6 and tap part number 2087-6 included in this kit.

Installation Notes

Thread repair inserts are typically installed by experienced mechanics, HVAC technicians, or maintenance professionals. Before beginning, de-energize and lock out any equipment on which the repair is being performed. Use the included drill bit to true up the damaged hole to the correct diameter, then use the included tap to cut new threads before driving the insert with the installation tool. Follow the insert manufacturer sequence precisely and use the tang removal tool to break off the drive tang flush after the insert is seated.