Heli-coil AT3585-02C086 Screw-locking Insert 2-56 Unc

Product Description

The HELI-COIL AT3585-02C086 is a screw-locking helical thread insert designed to create durable, vibration-resistant threads in tapped holes. Made from Grade 304 stainless steel with a bright finish, this tanged insert measures 0.086 inches in overall length at a 1D length-to-diameter ratio. It is engineered for 2-56 UNC thread applications and delivers a maximum locking torque of 20 oz-in with a minimum break-away torque of 3 oz-in. Maintenance technicians and assembly professionals install this type of insert to repair stripped threads or to reinforce threaded connections in metal components subject to repeated fastening cycles or mechanical vibration.

This insert is suited for use in light-duty precision assemblies where a compact, corrosion-resistant threaded insert is required. Typical applications include instrument housings, electronic enclosures, small-frame mechanical assemblies, and aerospace or industrial equipment where 2-56 UNC fastener engagement must be maintained under torque cycling or vibration. The tanged design allows standard installation tooling to seat and then break off the tang after installation. Grade 304 stainless steel construction supports use in corrosive or washdown environments where carbon steel inserts would be unsuitable.

Key Features

• Grade 304 stainless steel construction provides corrosion resistance in demanding environments
• 2-56 UNC thread size with 1D length-to-diameter ratio for compact thread engagement
• Maximum locking torque of 20 oz-in prevents fastener back-out under vibration
• Minimum break-away torque of 3 oz-in ensures controlled re-entry for serviceability
• Tanged design is compatible with standard helical insert installation tools
• Bright finish with 3 free coils; outside diameter range of 0.110 to 0.119 inches

Compatibility

Designed as an OEM-style screw-locking thread insert for tapped holes requiring 2-56 UNC threads in metal substrates where vibration resistance and thread integrity are required.

Installation Notes

Installation is performed using a manufacturer-specified helical insert installation tool matched to the 2-56 UNC thread size. Ensure the host material is tapped to the correct STI (Screw Thread Insert) tap specification before inserting. After driving the insert flush, break off the tang using a tang break-off tool. Always verify thread engagement depth and inspect the installed insert for proper seating before reassembling the fastened joint.