Heli-coil R1185-10 Free Running Insert 5/8-11 Unc

Product Description

The HELI-COIL R1185-10 is a free running wire thread insert designed to create or restore strong, precision threads in parent materials that are too soft, worn, or damaged to hold a fastener reliably. The insert is manufactured from bright, uncoated stainless steel and features a tanged design to aid installation with a standard HELI-COIL installation tool. At 0.938 inches overall length and a 1-1/2D length-to-diameter ratio, this insert suits applications where thread depth is limited and load distribution across the coil matters. Machinists, maintenance technicians, and field mechanics install these inserts as part of thread repair or original equipment manufacturing procedures.

This insert is sized for 5/8-11 UNC threads, a common fastener standard found in structural assemblies, heavy equipment, industrial machinery, and automotive applications. The tanged configuration allows the installer to drive the coil into a prepared tapped hole, then break off the tang once the insert is seated. Stainless steel construction provides corrosion resistance in environments where steel or aluminum parent material is exposed to moisture, chemicals, or temperature cycling. Each package contains 6 inserts.

Key Features

• 5/8-11 UNC thread size for compatibility with standard inch-series fasteners
• 0.938 inches overall length with 1-1/2D length-to-diameter ratio for adequate thread engagement in constrained bores
• Tanged design for controlled installation using a standard drive tool; tang breaks off cleanly after seating
• Stainless steel construction provides corrosion resistance and durability in demanding service environments
• Bright, uncoated finish maintains dimensional accuracy without coating buildup affecting thread fit
• 8-1/2 free coils per insert for consistent load distribution along the thread length

Compatibility

Designed for use in any parent material tapped to accept a 5/8-11 UNC free running HELI-COIL insert, including steel, aluminum, cast iron, and other materials requiring thread reinforcement or repair.

Installation Notes

Installation requires a correctly sized HELI-COIL tap and installation tool matched to the 5/8-11 insert series. Ensure the parent material is drilled and tapped to the proper HELI-COIL tap drill size before driving the insert. After the insert is fully seated, break off the installation tang using the appropriate tang break-off tool. Follow applicable shop safety procedures and de-energize or lock out any equipment before performing thread repair on machinery or structural components.