Heli-coil A3585-02CNW172 Screw-locking Insert 2-56 Unc

Product Description

The HELI-COIL A3585-02CNW172 is a screw-locking helical coil threaded insert designed to create strong, vibration-resistant internal threads in a host material. Manufactured from Grade 304 stainless steel with a dry film lubricant finish, this tangless insert installs without a tang-break step, reducing debris risk in blind-hole applications. The insert measures 0.172 inches in overall length at a 2D length-to-diameter ratio for the 2-56 UNC thread size. With a maximum locking torque of 20 oz-in and a minimum breakaway torque of 3.00 oz-in, it delivers consistent prevailing torque performance in precision assemblies. Licensed electricians, HVAC technicians, and mechanical assembly professionals rely on this insert type for thread repair and thread reinforcement in metal or composite components.

This insert is suited for applications requiring a permanent, locking threaded insert in fine-pitch 2-56 UNC threaded bores. Typical use cases include control panel assemblies, HVAC equipment enclosures, electrical junction boxes, and precision mechanical subassemblies where vibration or repeated fastener cycling could compromise thread integrity. The Grade 304 stainless construction provides corrosion resistance in environments with moisture exposure or where dissimilar-metal contact is a concern.

Key Features

• Tangless design eliminates tang-break debris in blind-hole or critical assemblies
• Grade 304 stainless steel construction for corrosion resistance
• Dry film lubricant finish for consistent installation torque and reduced galling
• Maximum locking torque of 20 oz-in with minimum breakaway torque of 3.00 oz-in
• 2D length-to-diameter ratio at 0.172 inches overall length suits compact fastener envelopes
• 7-3/8 free coils provide reliable thread engagement across the insert length

Compatibility

Designed for installation into 2-56 UNC tapped holes prepared with the appropriate HELI-COIL tap and tangless insertion tooling. Verify host material tap diameter requirements before installation.

Installation Notes

Installation requires a properly sized HELI-COIL tangless tap and the matching tangless installation tool - standard tang-type tools are not compatible with this insert design. De-energize any assembly or equipment before performing thread repair work on components in active service. Follow the torque specifications of the fastener being secured after insert installation. Refer to HELI-COIL installation guidelines for minimum thread engagement depth in the host material.