Heli-coil A3585-10CN938 5/8-11 Unc Locking Insert

Product Description

The HELI-COIL A3585-10CN938 is a screw-locking helical coil threaded insert designed to create strong, vibration-resistant threads in tapped holes. It installs into a parent material to provide a precision-formed internal thread sized at 5/8-11 UNC. The insert is manufactured from Grade 304 stainless steel with a bright finish, offering corrosion resistance in demanding service environments. The tangless design eliminates the installation tang removal step, reducing installation time and preventing loose tang fragments in assemblies. Overall installed length is 0.938 inches at a 1-1/2D ratio. Licensed machinists, maintenance technicians, and MRO professionals use this insert for thread repair and new thread creation in metal components.

This insert is suited for industrial, commercial, and MRO applications where a reliable UNC threaded interface is required. The 5/8-11 UNC thread size makes it common in heavy mechanical assemblies, structural fastening points, and equipment frames. The stainless steel construction is appropriate where mild chemical exposure or moisture may be present. It is installed using a HELI-COIL compatible tangless installation tool. One insert is included per package.

Key Features

• Tangless design eliminates tang removal and prevents fragment contamination in the bore
• Grade 304 stainless steel construction resists corrosion and oxidation
• Screw-locking design with a maximum locking torque of 300 inch-pounds
• Minimum breakaway torque of 40 inch-pounds maintains clamp load under vibration
• Bright finish on coil surface for consistent seating and installation
• 8-1/2 free coils provide full thread engagement across the 0.938 inch installed length

Compatibility

Designed as an OEM-style threaded insert for 5/8-11 UNC tapped holes requiring a screw-locking helical coil solution in stainless steel.

Installation Notes

Installation is performed using a HELI-COIL compatible tangless insertion tool sized for 5/8-11 UNC; verify tool compatibility before starting work. The parent material must be tapped to the correct HELI-COIL STI tap specification for 5/8-11 UNC prior to insert installation. De-energize or lock out any equipment before performing thread repair or insert installation on in-service machinery. Do not use standard tap dimensions for the STI tapped hole, as this will result in improper insert fit and reduced holding strength.