Heli-coil R1191-3 Free Running Insert 10-32 0.285 Inch 12 Pack

Product Description

The HELI-COIL R1191-3 is a free running wire thread insert designed to install into a drilled and tapped hole to create a strong, durable internal thread in materials that are prone to wear or stripping. The insert measures 0.285 inches overall length, follows a 10-32 UNF thread standard, and carries a 1-1/2D length-to-diameter ratio. Constructed from stainless steel with a bright, uncoated finish, this tanged insert is suited for applications where corrosion resistance and thread integrity are critical. Each package contains 12 inserts. Installation is performed by machinists, maintenance technicians, and assembly professionals in industrial, automotive, and equipment repair environments.

This insert is used to repair or reinforce 10-32 UNF threaded holes in metal components across a wide range of industries including aerospace, automotive, HVAC equipment manufacturing, and general industrial assembly. The free running design allows normal thread engagement without locking, making it appropriate for fasteners that require repeated removal and reinstallation. With 6-7/8 free coils, the insert provides consistent thread contact along the full installed length.

Key Features

• 10-32 UNF thread size for standard fractional inch fastener compatibility
• 0.285 inch overall length with a 1-1/2D length-to-diameter ratio
• Stainless steel construction provides corrosion resistance and long service life
• Tanged design aids installation with standard insert drive tools
• Free running coil style allows unrestricted thread engagement
• Package contains 12 inserts

Compatibility

Designed as an OEM-style thread repair and reinforcement insert for tapped holes requiring a 10-32 UNF internal thread profile in metal or hard plastic substrates.

Installation Notes

Installation requires a properly sized HELI-COIL tap and an appropriate insert drive tool; standard thread repair procedure calls for drilling, tapping, and driving the insert to flush or slightly below the parent material surface. Power down or de-energize any assembly before performing thread repair work on live equipment. After the insert is seated, break off the installation tang using a tang break-off tool or needle-nose pliers. Always verify the finished thread with a go/no-go gauge before returning the assembly to service.