Heli-coil 4936 Thread Repair Kit 1/2-20 Unf 60 Inserts

Product Description

The HELI-COIL 4936 is a threaded insert thread repair kit designed to restore damaged or stripped UNF internal threads across six common inch sizes. The kit covers a range from No. 10-32 up to 1/2-20, providing 60 stainless wire inserts total along with the drill, tap, and installation tool needed to complete the repair. Mechanics, maintenance technicians, and field service pros use this kit to bring stripped fastener holes back to full thread strength without replacing the base component. It is a self-contained kit that eliminates the need to source tools separately.

This kit is suited for automotive, industrial, and general maintenance applications where UNF fine-thread repairs are required. The six included thread sizes cover the most common fine-thread fastener dimensions encountered in engine work, equipment repair, and precision assemblies. Each size uses a coiled wire insert that installs into an oversized tapped hole and restores the original thread profile. The kit is appropriate for use in aluminum, cast iron, steel, and other base materials where thread damage has occurred.

Key Features

• Covers six UNF thread sizes: No. 10-32, 1/4-28, 5/16-24, 3/8-24, 7/16-20, and 1/2-20
• Includes 60 threaded wire inserts across all six sizes
• Includes drill, tap, and installation tool for each size - no additional tooling required
• Thread standard is UNF (Unified National Fine)
• Restores stripped or damaged internal threads to original thread profile
• Self-contained kit format supports field and shop use

Compatibility

Designed as an OEM-style thread repair solution for any application requiring UNF internal thread restoration across sizes No. 10-32 through 1/2-20.

Installation Notes

Thread repair inserts are typically installed by mechanics or maintenance technicians using the included drill, tap, and installation tool in sequence. Before beginning, secure the workpiece and ensure the damaged hole is clean and free of debris. Drill and tap to the specified oversize dimension for each insert size using only the included tooling to maintain correct thread geometry. Tang removal is not required for this kit as a tang removal tool is not included, so select inserts accordingly for blind-hole applications.