Heli-coil 5401-6 Thread Repair Kit 3/8-16 Unc 18 Inserts

Product Description

The HELI-COIL 5401-6 is a complete threaded insert repair kit designed to restore damaged or stripped internal threads to their original specification. The kit targets 3/8-16 UNC thread sizes and includes everything needed to complete a full repair: a drill, a tap, an installation tool, a tang removal tool, and 18 stainless coil inserts ranging from 0.375 inches to 0.750 inches in length. The nominal insert length is 0.562 inches. This kit is used by machinists, field service technicians, and maintenance professionals working on equipment where thread integrity is critical.

This kit is suited for both shop and field repair applications where 3/8-16 UNC threads have been stripped, cross-threaded, or otherwise damaged. Common applications include equipment maintenance in industrial, HVAC, and mechanical service environments. With 18 inserts split across three length sizes at 6 inserts each, the kit supports multiple repairs per job. The included installation tool is part number 2288-6, the tap is part number 6CPB, and the insert package is part number R1185-6, allowing individual component reorder if needed.

Key Features

• Complete kit includes drill, tap, installation tool, tang removal tool, and 18 wire thread inserts
• Repairs 3/8-16 UNC internal threads to original specification
• Insert lengths range from 0.375 inches to 0.750 inches with 6 inserts per length
• Nominal insert length of 0.562 inches for standard depth repairs
• Tang removal tool size: 9/32 inches
• Component part numbers enable individual reorder of inserts, tap, or installation tool

Compatibility

Designed for use in any application requiring repair of 3/8-16 UNC threaded holes where the parent material threads have been damaged or stripped.

Installation Notes

Thread repair inserts of this type are typically installed by machinists or maintenance technicians following the drill, tap, and insert sequence included with the kit. Always de-energize and lock out any equipment before beginning thread repair work. Follow the tap manufacturer sequence to avoid oversizing the repair hole. Remove the tang after installation using the included tang removal tool to ensure full thread clearance.