Heli-coil A1185-04CNPF224 4-40 Unc Threaded Insert 0.224 in

Product Description

The HELI-COIL A1185-04CNPF224 is a free running wire thread insert designed to create strong, wear-resistant internal threads in tapped holes. Built from 304 stainless steel with a primer-free finish, this tanged insert measures 0.224 inches in overall length and accepts a 4-40 UNC thread. It features a 2D length-to-diameter ratio and 6-3/4 free coils, providing reliable thread engagement in both parent materials and fastener replacement applications. Installation is performed by licensed mechanics, maintenance technicians, and trade professionals working with stripped or damaged threaded holes across metal and composite assemblies.

This insert is suited for light-duty fastening applications where a 4-40 UNC thread is required. The 304 stainless steel construction makes it appropriate for environments where corrosion resistance is a factor, including marine, food service, and industrial settings. Its compact 0.224-inch length fits tight assemblies where space is limited. The primer-free finish is compatible with standard insert installation without additional surface preparation.

Key Features

• 4-40 UNC thread standard for compatibility with common inch-series fasteners
• 304 stainless steel construction provides corrosion resistance in demanding environments
• 0.224-inch overall length suits low-profile and space-constrained assemblies
• Tanged design for use with standard tang break-off tools after installation
• 6-3/4 free coils deliver full thread engagement across the insert length
• Primer-free finish requires no additional surface preparation before installation

Compatibility

Designed as an OEM-style thread repair and thread reinforcement insert for any application using 4-40 UNC threaded holes in metal or composite parent materials.

Installation Notes

Installation requires a HELI-COIL or compatible insert installation tool sized for the 4-40 thread. The parent material must be drilled and tapped to the correct insert tap size before the insert is wound in. After seating the insert to the proper depth, break off the tang using a tang break-off tool. Power down or de-energize any equipment before servicing threaded connections on electrical or mechanical assemblies.