Heli-coil A1185-3CN475 Free Running Insert 10-24 Unc

Product Description

The HELI-COIL A1185-3CN475 is a free running wire thread insert designed to repair or reinforce internal threads in a wide range of base materials. This tanged insert features a 10-24 UNC thread size and an overall length of 0.475 inches, placing it in the 2-1/2D length-to-diameter ratio category. Constructed from 304 stainless steel with a bright, uncoated finish, it delivers solid corrosion resistance and retains thread engagement integrity under mechanical load. The coiled design provides 9-1/4 free coils that distribute stress evenly across the mating fastener, reducing the risk of thread pullout or stripping in softer parent materials.

Free running inserts like the A1185-3CN475 are used wherever a durable threaded hole is needed but the base material cannot support reliable thread engagement on its own. Common applications include aluminum housings, castings, and plastic or composite components found in HVAC equipment, electrical enclosures, and mechanical assemblies. The tanged configuration is compatible with standard HELI-COIL insertion tools, which drive the insert to the correct depth. Machinists, maintenance technicians, and field service pros working across industrial, commercial, and light manufacturing environments routinely rely on this insert type for both thread repair and new-production thread reinforcement.

Key Features

• 10-24 UNC thread size for compatibility with common inch-series fasteners
• 0.475 inch overall length at a 2-1/2D length-to-diameter ratio for strong thread engagement depth
• 304 stainless steel construction provides corrosion resistance in demanding service environments
• Tanged design works with standard HELI-COIL insertion tooling for controlled installation depth
• 9-1/4 free coils distribute fastener load across the full insert length
• Bright, uncoated finish maintains dimensional accuracy without coating buildup

Compatibility

Designed as an OEM-style free running threaded insert for use in standard 10-24 UNC tapped holes prepared with the appropriate HELI-COIL tap and installation tool set.

Installation Notes

Installation is performed by machinists or maintenance technicians using the correct HELI-COIL tang break-off tool and insertion tool sized for 10-24 UNC. The parent material must be drilled and tapped with the matching HELI-COIL oversize tap before insert installation. Power down or de-energize any equipment being serviced before beginning thread repair work. After driving the insert to the correct depth, break off the installation tang using the designated tang break-off tool and remove the tang from the bore.