Heli-coil 5403-4 Thread Repair Kit M4 X 0.70 18 Inserts

Product Description

The HELI-COIL 5403-4 is a complete threaded insert repair kit designed to restore damaged or stripped M4 x 0.70 metric coarse threads to full load-bearing strength. The kit includes 18 stainless steel wire inserts in three length variants, along with all tooling required to complete the repair without sourcing additional components. Insert lengths range from 4 mm to 8 mm, with a nominal insert length of 6 mm. This kit is used by machinists, maintenance technicians, and field service professionals working on metal components where thread integrity has been compromised.

This kit is suited for thread repair in a wide range of industrial, mechanical, and equipment maintenance applications involving M4 x 0.70 metric coarse threaded holes. The included drill, tap, installation tool, and tang removal tool allow a technician to complete the full repair sequence in one operation. Six inserts are provided for each of the three length options, giving flexibility across different material thicknesses and fastener engagement requirements.

Key Features

• Complete kit includes drill, tap, installation tool (part number 3747-4), and tang removal tool
• 18 total inserts - 6 each at three length sizes ranging from 4 mm to 8 mm
• Nominal insert length of 6 mm for standard-depth M4 thread repairs
• Metric coarse thread standard (M4 x 0.70) for broad compatibility with metric fastener systems
• Tang removal tool sized at 1/8 inch for clean post-installation breakoff
• Insert package part number R1084-4; tap part number 2087-4 for individual reorder reference

Compatibility

Designed for use in any metal component with a damaged or stripped M4 x 0.70 metric coarse threaded hole where a helical wire insert repair is the specified or preferred remediation method.

Installation Notes

Thread repair kits of this type are installed by machinists or maintenance technicians following a drill, tap, and insert sequence. Power down or de-energize any equipment before beginning thread repair on installed assemblies. Use the included drill and tap to prepare the hole to the correct oversize diameter before driving the insert with the installation tool. After seating the insert, use the tang removal tool to break off the drive tang per standard helical insert installation practice.