Heli-coil R1185-9 Free Running Insert 9/16-12 Unc

Product Description

The HELI-COIL R1185-9 is a free running wire thread insert engineered to create strong, wear-resistant internal threads in parent materials that are softer or more prone to thread damage than the fastener itself. Manufactured from stainless steel with a bright uncoated finish, this insert accepts a 9/16-12 UNC thread and measures 0.844 inches in overall length, corresponding to a 1-1/2D length-to-diameter ratio. The tanged design aids installation by providing a drive point for the installation tool. Machinists, maintenance technicians, and field service professionals use these inserts for thread repair and original equipment assembly across a wide range of industrial and mechanical applications.

This insert is suited for thread repair or new thread installation in ferrous and non-ferrous base materials including aluminum, cast iron, and steel. The 9/16-12 UNC coarse thread profile makes it a common choice in structural and general mechanical fastening scenarios where standard unified coarse threads are specified. With 8-1/4 free coils, the insert provides full thread engagement across the installed length. Each package contains 6 inserts, making it practical for single-job use or bench stock replenishment.

Key Features

• 9/16-12 UNC thread size with 0.844 inch overall insert length at a 1-1/2D ratio
• Stainless steel construction with bright uncoated finish for corrosion resistance
• Tanged design for positive engagement with standard HELI-COIL installation tools
• 8-1/4 free coils for full thread contact and load distribution
• Packaged in a quantity of 6 inserts per unit

Compatibility

Designed as an OEM-style and repair replacement thread insert for tapped holes requiring a 9/16-12 UNC internal thread profile in metal or composite parent materials.

Installation Notes

Installation requires a compatible HELI-COIL tang drive tool and a properly sized tap to prepare the parent material bore before insert placement. Power down or de-energize any equipment before performing thread repair on in-service machinery. After the insert is seated flush or slightly below the surface, the installation tang must be broken off using a tang break-off tool; retain and dispose of the tang rather than leaving it in the assembly. Follow applicable shop or OEM torque specifications for the final fastener.