Heli-coil 5402-9 Thread Repair Kit 9/16-18 Unf Threaded Insert

Product Description

The HELI-COIL 5402-9 is a complete thread repair kit designed to restore stripped or damaged 9/16-18 UNF internal threads to original tolerance. The kit uses a threaded insert method, where a coiled-wire insert is driven into a re-tapped hole to create a new, durable thread form. Insert length is 0.844 inches. This kit is used by maintenance technicians, mechanics, and trade professionals working on equipment where thread integrity is critical and replacement of the parent component is not practical.

This kit suits repair work on ferrous and non-ferrous base materials where a 9/16-18 UNF thread has failed due to stripping, cross-threading, or corrosion damage. It is appropriate for automotive, industrial, and mechanical maintenance applications. The complete tooling included allows the job to be performed in the field or shop without sourcing components separately. Six inserts are included per kit, making it suitable for single-job use or small-batch repairs.

Key Features

• Thread size: 9/16-18 UNF - fine-pitch internal thread repair
• Insert length: 0.844 inches for full thread engagement depth
• Includes drill bit, tap, installation tool, and tang removal tool - no additional tooling required
• Six inserts included per kit
• Thread standard: UNF (Unified National Fine)
• Component part numbers: tap 38193-9, installation tool 2299-9, insert package R1191-9

Compatibility

Designed as an OEM-style thread repair solution for any application requiring a 9/16-18 UNF threaded insert repair in compatible base materials.

Installation Notes

Installation should be performed by a qualified mechanic or maintenance technician familiar with thread repair procedures. The parent material must be drilled to the specified insert drill size, then tapped using the included tap before driving the insert. Power down or de-energize any associated equipment before beginning thread repair work. Follow the sequence of drill, tap, and install in order - skipping steps will result in improper thread engagement.