Heli-coil AT1185-02C129 Free Running Insert 2-56 0.129 in

Product Description

The HELI-COIL AT1185-02C129 is a free running helical wire thread insert designed to create or restore durable internal threads in tapped holes. Manufactured from 304 stainless steel with a bright, uncoated finish, this insert provides corrosion-resistant thread reinforcement in materials subject to wear, stripping, or damage. It features a 2-56 UNC thread size and an overall length of 0.129 inches, representing a 1-1/2D length-to-diameter ratio. The tangless design eliminates the installation and removal of a driving tang, streamlining the installation process. Licensed HVAC technicians, maintenance machinists, and industrial tradespeople install these inserts using appropriate HELI-COIL installation tooling.

This insert is suited for applications requiring precision thread repair or original thread installation in aluminum, magnesium, plastics, and other materials where thread strength must meet or exceed parent material ratings. The 2-56 UNC thread size targets small-fastener applications commonly found in electrical enclosures, instrument panels, HVAC controls, and light mechanical assemblies. With 5-1/4 free coils, the insert distributes load evenly across the engaged thread length. Each unit is sold individually, with a minimum order quantity of 100 pieces.

Key Features

• 2-56 UNC thread size for small-fastener thread repair and installation
• Overall insert length of 0.129 inches at a 1-1/2D length-to-diameter ratio
• 304 stainless steel construction for corrosion resistance and long service life
• Tangless design eliminates tang break-off and removal steps during installation
• 5-1/4 free coils for even load distribution across the thread engagement zone
• Bright, uncoated finish - no surface treatment to interfere with close-tolerance applications

Compatibility

Designed as an OEM-style free running thread insert for use in tapped holes requiring 2-56 UNC thread repair or thread installation across general industrial, electrical, and mechanical assembly applications.

Installation Notes

Installation requires a properly sized HELI-COIL tap and compatible tangless installation tool for the 2-56 thread size. Ensure the parent material is drilled and tapped to the correct HELI-COIL specification before driving the insert. Secure the workpiece and power down any associated equipment before performing thread repair on live assemblies. Do not attempt installation without the designated drive tool, as improper insertion can damage the insert or the tapped bore.