Heli-coil AT1185-02C172 Free Running Insert 2-56 Unc

Product Description

The HELI-COIL AT1185-02C172 is a free running wire thread insert designed to create or restore durable internal threads in tapped holes. Built from 304 stainless steel with a bright, uncoated finish, it accepts a 2-56 UNC thread and measures 0.172 inches in overall length, corresponding to a 2D length-to-diameter ratio. This tangless design eliminates the need for tang removal after installation, reducing assembly steps and preventing loose debris inside the assembly. Licensed electricians, mechanical contractors, and precision assembly technicians install these inserts wherever fine-threaded fastener retention is required in softer or damaged base materials.

This insert is suited for precision repair and original-equipment applications across industrial, electrical, and mechanical assembly environments. The 2-56 UNC thread size places it in small-fastener applications such as control panel assemblies, instrument enclosures, and light electrical fixtures. The 304 stainless steel construction provides corrosion resistance appropriate for humid or mildly corrosive service environments. Each unit is sold individually, though a minimum order quantity of 100 pieces applies.

Key Features

• Tangless design eliminates post-installation tang removal and prevents debris contamination
• 304 stainless steel construction provides corrosion resistance in demanding service environments
• 2-56 UNC thread standard for compatibility with fine small-diameter fastener applications
• 0.172-inch overall length with a 2D length-to-diameter ratio for controlled thread engagement depth
• 7-3/8 free coils deliver consistent thread-form geometry after installation
• Bright, uncoated finish suitable for applications where coating thickness is a concern

Compatibility

Designed as an OEM-style free running thread insert for tapped holes requiring a 2-56 UNC internal thread form in metallic or composite base materials.

Installation Notes

Thread insert installation is performed by machinists and assembly technicians using the appropriate HELI-COIL installation tool matched to the 2-56 thread size. The base material hole must be drilled and tapped to the correct STI (Screw Thread Insert) tap size before insert installation. Power down and de-energize any assembly before inserting components into control panels or electrical enclosures. Do not force the insert with incorrect tooling, as this can distort the coil geometry and compromise thread integrity.