Heli-coil 5401-9 Thread Repair Kit 9/16-12 Unc 6 Inserts

Product Description

The HELI-COIL 5401-9 is a threaded insert thread repair kit designed to restore damaged or stripped internal threads to their original specification. The kit covers 9/16-12 UNC thread size with an insert length of 0.844 inches, making it suitable for restoring fastener engagement in metal components where thread failure has occurred. All necessary tooling is included in the package, so the job can be completed without sourcing additional components. This kit is used by mechanics, maintenance technicians, and industrial tradespeople working on equipment requiring UNC-standard threaded connections.

This kit is applicable across general mechanical maintenance, industrial repair, and equipment overhaul work wherever 9/16-12 UNC threads have been stripped or damaged. The included drill, tap, and installation tool make it a self-contained solution for field or shop use. The tang removal tool is included for finishing the insert installation. Six inserts are provided per kit, each at 0.844 inches in length, allowing for multiple repairs from a single package.

Key Features

• 9/16-12 UNC thread size for standard unified coarse thread repair
• Insert length of 0.844 inches for full thread engagement
• Includes drill, tap, installation tool, and tang removal tool - complete kit, no additional tooling required
• Six inserts per kit for multiple repairs
• Installation tool part number 2288-9, tap part number 187-9, insert package part number R1185-9 for individual component reorder

Compatibility

Designed as an OEM-style thread repair solution for metal components with 9/16-12 UNC internal threads that have been stripped or damaged.

Installation Notes

Installation is typically performed by a machinist, mechanic, or maintenance technician using the included drill, tap, and installation tool. The damaged thread must be drilled out and re-tapped to the correct insert diameter before the helical insert is driven in. Always ensure the workpiece is secured and power to any associated equipment is removed before beginning thread repair work. Follow the tool manufacturer's procedure sequence - drill, tap, insert, then remove the tang - to achieve proper thread form and depth.