Heli-coil 5401-12 Thread Repair Kit 3/4-10 Unc

Product Description

The HELI-COIL 5401-12 is a complete threaded insert thread repair kit designed to restore damaged or stripped internal threads to their original specification. The kit targets 3/4-10 UNC thread size with an insert length of 1.125 inches and includes every component needed to complete a full repair without sourcing additional tooling. It is used across mechanical, industrial, and heavy-equipment applications where thread integrity is critical. Installation is performed by licensed mechanics, millwrights, and maintenance technicians working on threaded fastener repairs in metal components.

This kit is suited for repairing stripped 3/4-10 UNC threads in ferrous and non-ferrous base materials encountered in general manufacturing, equipment maintenance, and industrial repair environments. The package includes four inserts, making it practical for multiple repairs from a single kit. The included drill size is 25/32 inch, and the kit pairs directly with tap part number 8187-12, installation tool part number 2288-12, and insert package part number R1185-12 for a fully integrated repair process.

Key Features

• Repairs 3/4-10 UNC internal threads to original specification
• Insert length of 1.125 inches for deep thread engagement
• Includes drill, tap, installation tool, and tang removal tool - no additional tooling required
• Four inserts included per kit for multiple repairs
• 25/32 inch drill size matched to the required tap and insert
• UNC thread standard for compatibility with standard inch-series fasteners

Compatibility

Designed for repairing 3/4-10 UNC threaded holes in metal components across industrial, mechanical, and maintenance applications. Works with installation tool 2288-12, tap 8187-12, and insert package R1185-12 as noted in the kit documentation.

Installation Notes

Installation is performed by mechanics or maintenance technicians using the included drill, tap, and installation tool in sequence. The damaged hole must be drilled to the specified 25/32 inch diameter before tapping and insert installation. Power down or de-energize any associated equipment before beginning thread repair work. Follow standard thread repair procedures and manufacturer instructions included with the kit.