Heli-coil A3585-8CN500 Screw-locking Insert 1/2-13 Unc

Product Description

The HELI-COIL A3585-8CN500 is a screw-locking helical wire thread insert designed to lock fasteners in place and restore or reinforce internal threads in a host material. With a 1/2-13 UNC thread size and a 1D length-to-diameter ratio, this insert measures 0.5 inches in overall length. It is manufactured from Grade 304 stainless steel with a bright finish, making it suitable for corrosive or high-moisture environments. The tangless design eliminates the installation tang removal step, reducing installation time and preventing loose tang debris inside assemblies. Licensed technicians and maintenance professionals in industrial, HVAC, plumbing, and mechanical trades install this type of insert during thread repair or original equipment assembly.

This insert is used in applications requiring a secure, vibration-resistant threaded connection in metallic or composite host materials. The screw-locking feature provides resistance to fastener back-out under dynamic load and vibration. Typical install scenarios include thread repair on equipment housings, valve bodies, mechanical enclosures, and structural components where a 1/2-13 UNC thread is required. The 304 stainless steel construction suits both indoor and outdoor service environments where corrosion resistance is a priority.

Key Features

• Tangless design eliminates tang removal after installation, reducing debris risk in closed assemblies
• Grade 304 stainless steel construction for corrosion resistance in demanding service environments
• Screw-locking configuration resists fastener loosening caused by vibration and dynamic loads
• 1/2-13 UNC thread standard with 1D length-to-diameter ratio for standard-depth thread repair
• Maximum locking torque rated at 150 inch-pounds with a minimum breakaway torque of 24 inch-pounds
• Bright finish with 4-7/8 free coils for consistent installation performance

Compatibility

Designed as an OEM-style thread repair and locking insert for host materials tapped to accept a 1/2-13 UNC helical insert, requiring a minimum outside diameter clearance of 0.5970 inches and a maximum of 0.6220 inches.

Installation Notes

Installation of helical thread inserts requires a properly tapped hole prepared with the correct HELI-COIL tap size for the 1/2-13 UNC insert, along with the appropriate tangless installation tool. De-energize or depressurize the equipment being serviced before beginning any thread repair work. Do not exceed the rated locking torque during fastener installation to avoid insert damage or host material failure. This work is typically performed by mechanical, HVAC, or maintenance technicians following the equipment manufacturer's service procedures.