Heli-coil A1185-4GN500 Free Running Insert 1/4-20 Titanium

Product Description

The HELI-COIL A1185-4GN500 is a free running helical wire thread insert designed to restore or reinforce 1/4-20 UNC threaded holes in parent material. Manufactured from titanium with a bright, uncoated finish, this tanged insert installs into a pre-drilled and tapped hole to provide a hardened, wear-resistant thread form. At 0.5 inches overall length, it delivers a 2D length-to-diameter ratio - a standard choice for applications where full thread engagement is required without excessive depth. The insert features 8 free coils and is supplied as a single insert per package.

Free running inserts of this type are commonly used in aerospace, automotive, and industrial maintenance applications where threads in softer base materials need protection or where damaged threads require repair. The titanium construction makes the A1185-4GN500 well suited for environments that demand corrosion resistance and a high strength-to-weight ratio. Installation requires a HELI-COIL tap and installation tool sized for 1/4-20 thread. This insert is appropriate for use by machinists, maintenance technicians, and assembly professionals working on precision components.

Key Features

• Titanium construction for corrosion resistance and high strength-to-weight performance
• 1/4-20 UNC thread size for broad compatibility with standard inch-series fasteners
• 0.5 inch overall length with a 2D length-to-diameter ratio
• Tanged design for controlled installation using standard HELI-COIL tooling
• Bright, uncoated finish - no coating to affect thread tolerance
• 8 free coils for consistent thread form throughout full insert length

Compatibility

Designed for use in 1/4-20 UNC tapped holes prepared with the appropriate HELI-COIL tap. Intended for installation with a compatible HELI-COIL installation tool for tanged inserts in the 1/4-20 thread size.

Installation Notes

Installation requires the parent material hole to be drilled and tapped with the correct HELI-COIL oversized tap for 1/4-20 thread before the insert is driven in. Use the proper HELI-COIL tang break-off tool to remove the driving tang after installation where the tang cannot remain in the assembly. Ensure the workpiece is secured and the hole is clean and free of debris before installing the insert. Follow applicable shop standards and manufacturer tooling guidelines for correct installation depth and coil seating.