Heli-coil 1191-3CN380S Free Running Insert 10-32 Unf

Product Description

The HELI-COIL 1191-3CN380S is a free running helical wire thread insert designed to create strong, wear-resistant threads in parent materials that are soft, damaged, or prone to stripping. Manufactured from 304 stainless steel, this tanged insert measures 0.38 inches in overall length and accepts a 10-32 UNF thread size. The 2D length-to-diameter ratio and 9-1/2 free coils provide full thread engagement across a compact installation depth. Licensed HVAC technicians, mechanics, and maintenance professionals use inserts like this to restore or reinforce tapped holes in aluminum, cast iron, and other base materials without full re-machining.

This insert fits applications where 10-32 UNF threaded fasteners must seat in a parent material that cannot hold threads reliably on its own. Common installation scenarios include control panel enclosures, equipment housings, motor mounts, and sheet metal assemblies found in HVAC equipment, electrical panels, and light industrial machinery. The tanged design is compatible with standard HELI-COIL installation tooling, allowing the installer to drive and break off the tang after seating in a single workflow.

Key Features

• 304 stainless steel construction resists corrosion and withstands elevated service temperatures
• 10-32 UNF thread size with 2D length-to-diameter ratio for reliable engagement in shallow bores
• 0.38 inch overall length fits tight installation depths where space is limited
• Tanged design works with standard helical insert installation drivers for fast, consistent seating
• 9-1/2 free coils distribute clamp load evenly across the full insert length
• Package quantity of 1,000 inserts supports high-volume repair and production use

Compatibility

Designed for use in any parent material drilled and tapped to HELI-COIL specifications for a 10-32 UNF free running insert; requires the corresponding HELI-COIL tap and installation tool for proper fitment.

Installation Notes

Installation requires a pre-drilled hole tapped with the correct HELI-COIL insert tap for the 10-32 UNF size - a standard 10-32 tap is not an equivalent substitute. Use the manufacturer-specified insertion tool to drive the insert to the correct depth without distorting the coils. After seating, break off the installation tang using a tang break-off tool or long-nose pliers, and verify the tang has been fully removed from the hole before reassembly. This work is typically performed by machinists, maintenance technicians, or service professionals familiar with thread repair procedures.