Heli-coil 5402-10 Thread Repair Kit 5/8-18 Unf Threaded Insert

Product Description

The HELI-COIL 5402-10 is a complete thread repair kit designed to restore stripped or damaged 5/8-18 UNF internal threads to original spec. The kit uses a coiled wire threaded insert that installs into a re-drilled and re-tapped hole, creating a durable helical thread form that meets or exceeds the strength of the original material. Each kit includes a drill bit, a 5/8-18 UNF tap, an installation tool, and a tang removal tool, along with 6 inserts at 0.938 inches in length. Licensed trades, machinists, and field service technicians use this kit to salvage damaged tapped holes without replacing the entire component.

This kit is suited for repair work on aluminum, cast iron, steel, and other base materials where thread stripping is common from overtorque or corrosion. Typical applications include engine components, hydraulic manifolds, industrial equipment housings, and structural fastener locations requiring a 5/8-18 UNF thread form. The 0.938-inch insert length provides solid thread engagement for high-load fastener situations. The included tooling makes this a self-contained solution for both shop and field repairs without sourcing separate components.

Key Features

• Repairs 5/8-18 UNF threaded holes using a coiled wire insert design
• Insert length of 0.938 inches for strong thread engagement
• Includes drill bit, UNF tap (part number 8193-10), installation tool (part number 2299-10), and tang removal tool
• Comes with 6 inserts (insert package part number R1191-10)
• Thread standard is UNF - fine-thread series for vibration-prone and precision applications
• Self-contained kit requires no additional tooling to complete the repair

Compatibility

Designed as a thread repair solution for any application requiring a 5/8-18 UNF threaded insert. Compatible with base materials commonly encountered in industrial, automotive, and mechanical service work where stripped or damaged fine-thread holes need restoration.

Installation Notes

Thread repair should be performed by a machinist or qualified technician familiar with tapping procedures. Always isolate or de-energize the equipment before beginning any thread repair on structural or mechanical components. Drill to the specified oversize diameter, tap the new hole with the included tap, then drive the insert using the installation tool. After seating the insert, remove the drive tang with the included tang removal tool per standard HELI-COIL procedure.