Heli-coil AT1191-3C285 Free Running Insert 10-32 0.285 in

Product Description

The HELI-COIL AT1191-3C285 is a free running helical wire threaded insert designed to install and repair 10-32 UNF internal threads in parent materials that require durable, long-lasting thread reinforcement. Manufactured from 304 stainless steel with a bright, uncoated finish, this tangless insert measures 0.285 inches in overall length, corresponding to a 1-1/2D length-to-diameter ratio. It carries 6-7/8 free coils and installs without a tang, eliminating the tang-breakoff step common in traditional insert designs. Licensed trades and production assemblers rely on these inserts to restore or upgrade thread integrity in metal, composite, and soft-alloy components.

This insert is suited for precision assembly, maintenance, and repair applications where 10-32 UNF threads must meet tight tolerances under mechanical load or vibration. Common install scenarios include fastener thread repair in HVAC equipment housings, electrical enclosures, pump bodies, and other light mechanical assemblies. The stainless steel construction makes it appropriate for environments with exposure to moisture or mild corrosives. This is a single-insert unit; minimum order quantities apply for procurement planning.

Key Features

• 10-32 UNF thread size for standard unified fine-thread applications
• Tangless design eliminates the tang removal step during installation
• 304 stainless steel construction for corrosion resistance in demanding environments
• 0.285-inch overall length at a 1-1/2D length-to-diameter ratio
• 6-7/8 free coils provide consistent load distribution across the thread engagement zone
• Bright, uncoated finish suitable for applications where coating interference is a concern

Compatibility

Designed as an OEM-style free running threaded insert for use in any parent material tapped to accept a 10-32 UNF helical insert, using the appropriate HELI-COIL installation tool for tangless insert series.

Installation Notes

Installation requires a correctly sized tap and a tangless insert installation tool matched to the 10-32 insert series. Power down or de-energize any equipment before performing thread repair on energized assemblies. Follow the tool manufacturer's installation procedure to achieve proper insert seating depth without overdriving. Confirm thread engagement length meets the requirements of the applicable fastener load specification before returning the assembly to service.