Heli-coil A1185-5CN469 5/16-18 Free Running Insert

Product Description

The HELI-COIL A1185-5CN469 is a free running wire thread insert designed to install a standard 5/16-18 UNC internal thread into a tapped hole. Made from 304 stainless steel with a bright, uncoated finish, it delivers corrosion resistance and reliable thread engagement in ferrous and non-ferrous base materials. The insert measures 0.469 inches overall length, corresponding to a 1-1/2D length-to-diameter ratio. The tanged design allows installation with a standard HELI-COIL installation tool. Machinists, maintenance technicians, and assembly professionals use this insert to repair stripped threads or establish durable threads in soft or brittle base materials.

This insert is suited for both original equipment assembly and field thread repair applications. The 5/16-18 UNC thread size is common across a wide range of industrial, mechanical, and structural assemblies. The free running style provides standard thread-class fit without locking or prevailing-torque resistance, making it appropriate for applications that require normal bolt or screw removal. It installs in through-holes or blind holes where thread integrity is critical and base material alone cannot support the required load.

Key Features

• 5/16-18 UNC thread size for broad compatibility with standard inch-series fasteners
• 304 stainless steel construction provides corrosion resistance in harsh environments
• Tanged design for use with standard HELI-COIL installation tooling
• 0.469 inches overall length at a 1-1/2D ratio for solid thread engagement
• Free running style delivers standard thread fit without locking interference
• 6-5/8 free coils for consistent load distribution across the thread length

Compatibility

Designed as a direct-fit free running insert for tapped holes requiring a 5/16-18 UNC internal thread profile in applications where 304 stainless steel is the specified insert material.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using the correct HELI-COIL tap and installation tool for the 5/16-18 insert series. The host material must be tapped with the appropriate oversize HELI-COIL tap before insert installation. Ensure the hole is clean and free of debris before driving the insert. After installation, remove the tang using a tang break-off tool if required by the application.