Heli-coil A3585-6CN750 Screw-locking Insert 3/8-16 Unc

Product Description

The HELI-COIL A3585-6CN750 is a tangless screw-locking wire thread insert designed to restore or reinforce internal threads in parent materials subject to vibration and repeated fastening cycles. Built from Grade 304 stainless steel with a bright finish, it installs into a pre-tapped hole to create a durable, locking thread that resists loosening under dynamic loads. The insert measures 0.75 inches overall length at a 2D length-to-diameter ratio for a 3/8-16 UNC thread. With a maximum locking torque of 80 in-lb and a minimum break-away torque of 12 in-lb, it delivers controlled, repeatable locking performance suited to precision assembly work in HVAC, mechanical, and industrial applications.

This insert is used wherever a 3/8-16 UNC threaded hole needs locking capability without adhesives or deformable fasteners. Typical applications include equipment housings, compressor components, pump bodies, brackets, and structural assemblies exposed to vibration or thermal cycling. The tangless design eliminates the tang-removal step required with standard inserts, reducing installation time and preventing loose tang debris inside assembled components. It is installed by licensed mechanics, assemblers, and service technicians working to manufacturer torque and thread-specification requirements.

Key Features

• Tangless design eliminates tang-removal step, reducing debris risk in closed assemblies
• Grade 304 stainless steel construction resists corrosion in wet and chemically exposed environments
• 3/8-16 UNC thread with 2D length-to-diameter ratio suits standard bolt patterns
• Maximum locking torque of 80 in-lb provides reliable fastener retention under vibration
• Minimum break-away torque of 12 in-lb allows controlled disassembly without thread damage
• Bright finish with outside diameter range of 0.452 to 0.472 inches for consistent seating in the tapped bore

Compatibility

Designed for installation into 3/8-16 UNC tapped holes prepared with the appropriate HELI-COIL tang-drive or tangless installation tool set. Suitable for use in steel, aluminum, cast iron, and other parent materials requiring thread reinforcement or repair.

Installation Notes

Installation requires a properly sized HELI-COIL tangless installation tool matched to the 3/8-16 UNC thread and 2D insert length. The parent material hole must be tapped to the correct HELI-COIL tap size before insert installation. De-energize or fully power down any equipment before performing thread repair work on live assemblies. Do not reuse an insert once it has been removed, as the locking element may not perform to specification after extraction.