Heli-coil 5402-5 Thread Repair Kit 5/16-24 Unf

Product Description

The HELI-COIL 5402-5 is a complete thread repair kit designed to restore stripped or damaged internal threads to factory-spec strength. The kit centers on a coiled wire threaded insert sized for 5/16-24 UNF applications, and comes with every tool needed to complete the repair in the field: a drill, a tap, an installation tool, and a tang removal tool. Installers get 36 inserts per kit, spread across three length options ranging from 0.312 inches to 0.625 inches, with 12 inserts per size. This kit is standard stock for any mechanic or technician who works on threaded fastener repairs in metal housings, castings, or structural components.

Thread repair kits like the HELI-COIL 5402-5 are used across HVAC, plumbing, and general mechanical trades wherever a tapped hole has been stripped or cross-threaded. Common applications include compressor housings, pump bodies, electrical enclosures, and sheet metal assemblies where re-tapping to a larger size is not an option. The 5/16-24 UNF thread standard is widely used in precision and fine-thread applications, making this kit a practical addition to any service van or shop toolbox.

Key Features

• 5/16-24 UNF thread size for fine-thread repair applications
• 36 inserts included: 12 each of short, mid, and long lengths (0.312, 0.469, and 0.625 inches)
• Complete kit includes drill, tap (part number 5FPB), installation tool (part number 2299-5), and 7/32 tang removal tool
• Insert package part number R1191-5 for reorder reference
• UNF thread standard ensures compatibility with fine-pitch fastener specifications
• Self-contained kit eliminates the need to source tools separately

Compatibility

Designed for use in any material that accepts a 5/16-24 UNF tapped hole, including aluminum, cast iron, steel, and similar base materials common in mechanical and trade equipment assemblies.

Installation Notes

Thread repair kits of this type are installed by qualified mechanics or trade technicians. Before beginning, power down or depressurize any system associated with the fastener being repaired. Follow the drill-tap-insert sequence included with the kit instructions: drill to the specified diameter, tap the new thread, drive the insert to the correct depth using the installation tool, then break off the tang with the removal tool. Do not reuse a damaged or deformed insert.