Heli-coil A1185-02CN129 2-56 Unc Free Running Insert

Product Description

The HELI-COIL A1185-02CN129 is a free running helical wire thread insert designed to create a strong, wear-resistant internal thread in tapped holes. Built from 304 stainless steel with a bright, uncoated finish, this insert accepts a 2-56 UNC thread and measures 0.129 inches in overall length, corresponding to a 1-1/2D length-to-diameter ratio. It features 5-1/4 free coils and a tanged design for installation with a standard HELI-COIL installation tool. Licensed mechanics, maintenance technicians, and precision assembly professionals install this type of insert when repairing stripped threads or building durable threaded connections in soft or weak base materials.

This insert is suited for light-duty precision applications requiring a fine 2-56 UNC internal thread in materials such as aluminum, magnesium, titanium, or plastics. Typical use cases include aerospace assemblies, electronic enclosures, instrumentation housings, and small-scale mechanical components where thread integrity is critical and base material threads are prone to stripping or wear over time. The stainless steel construction resists corrosion and maintains dimensional stability across a range of service environments.

Key Features

• 2-56 UNC thread size for light-duty precision thread repair and reinforcement
• 304 stainless steel construction for corrosion resistance and long service life
• 0.129 inches overall length with 1-1/2D length-to-diameter ratio
• 5-1/4 free coils provide consistent thread engagement and load distribution
• Tanged design for use with standard HELI-COIL installation tooling
• Bright, uncoated finish - no secondary treatment required before installation

Compatibility

Designed for use in any application requiring a free running 2-56 UNC helical wire thread insert. Compatible with standard HELI-COIL installation tools and tap sizes specified for 2-56 inserts.

Installation Notes

Installation requires a properly sized HELI-COIL tap to prepare the receiving hole, followed by use of a matching installation tool to drive the insert to the correct depth. After installation, the tang must be broken off using a tang break-off tool. Always verify that the parent material is drilled and tapped to the correct specification before inserting. Follow torque and depth guidelines specified by the base material and application requirements.