Heli-coil A1191-3CN190 Free Running Insert 10-32 Unf

Product Description

The HELI-COIL A1191-3CN190 is a free running helical wire thread insert designed to create durable, wear-resistant internal threads in tapped holes. Sized for 10-32 UNF thread and measuring 0.19 inches overall length, this insert delivers a 1D length-to-diameter ratio suitable for standard-depth thread repair and new thread installation. Constructed from 304 stainless steel with a bright, uncoated finish, it resists corrosion and maintains thread integrity under repeated fastener cycling. The tanged design simplifies installation using a standard HELI-COIL installation tool. This insert is sold as a single piece with a minimum order quantity of 10 units, making it appropriate for bench stock and small-batch service work. Licensed mechanics, maintenance technicians, and production assemblers are the typical end users.

This insert is used wherever a 10-32 UNF internal thread must be installed or restored in a parent material that cannot support adequate thread engagement on its own. Common applications include aluminum housings, magnesium castings, plastics, and other soft or damaged base materials found in HVAC equipment assemblies, electrical enclosures, and light mechanical components. The 1D length insert is well suited to thin-wall applications where material depth is limited. It is installed dry, without adhesive, and the tang is removed after installation to leave a clean finished thread.

Key Features

• 10-32 UNF thread size for standard fine-pitch fastener applications
• 0.19 inches overall length with 1D length-to-diameter ratio for shallow thread engagement
• 304 stainless steel construction provides corrosion resistance and long service life
• Tanged design enables controlled installation with a standard drive tool
• Bright, uncoated finish maintains dimensional consistency with no added coating thickness
• 4-1/8 free coils for reliable spring-action thread locking within the parent material

Compatibility

Designed as an OEM-style free running insert for any tapped hole requiring a 10-32 UNF thread form, including thread repair and original installation in soft or brittle parent materials.

Installation Notes

Installation requires a dedicated HELI-COIL installation tool sized for the 10-32 insert; do not attempt to drive the insert with improvised tools, as this can distort the coil geometry. Ensure the parent hole is tapped with the correct HELI-COIL STI tap before installation. After seating the insert flush or one half turn below the surface, break off the installation tang using a tang break-off tool or needle-nose pliers. Follow applicable facility or equipment manufacturer torque specifications for the fastener being used in the finished thread.