Heli-coil A3585-5CNPF469 5/16-18 Unc Locking Insert

Product Description

The HELI-COIL A3585-5CNPF469 is a tangless, screw-locking helical coil insert designed to create strong, vibration-resistant internal threads in a parent material. Manufactured from Grade 304 stainless steel with a primer free finish, this insert accommodates a 5/16-18 UNC thread and measures 0.469 inches in overall length, representing a 1-1/2D length-to-diameter ratio. With a maximum locking torque of 60 in/lb and a minimum breakaway torque of 7.50 in/lb, it delivers reliable thread locking without adhesives or additional hardware. The tangless design simplifies installation and removal, eliminating the need for tang break-off tools. Machinists, maintenance technicians, and assembly professionals install these inserts to repair damaged threads or reinforce threads in softer parent materials.

This insert is suited for applications in industrial, aerospace, and general mechanical assembly environments where corrosion resistance and secure thread engagement are required. The Grade 304 stainless steel construction makes it appropriate for use in environments exposed to moisture or mild chemicals. The 5/16-18 UNC thread size is a standard fastener pitch common across a wide range of equipment, fixtures, and structural assemblies. The primer free finish allows for use without pre-applied adhesives, keeping the installation process clean and straightforward.

Key Features

• Grade 304 stainless steel construction for corrosion resistance
• Tangless design eliminates tang break-off step during installation and removal
• Maximum locking torque of 60 in/lb for secure vibration-resistant thread engagement
• Minimum breakaway torque of 7.50 in/lb maintains hold under load
• Primer free finish for clean, adhesive-free installation
• 6-5/8 free coils provide consistent thread engagement across the insert length

Compatibility

Designed as an OEM-style thread repair and reinforcement insert for parent materials tapped to accept 5/16-18 UNC helical coil inserts with a 1-1/2D insert length.

Installation Notes

Installation is performed by machinists or assembly technicians using a compatible tangless insertion tool sized for 5/16-18 UNC inserts. The parent material must be drilled and tapped with the correct Heli-Coil tap size prior to insert installation. Power down or de-energize any equipment before performing thread repair on in-service components. Follow the tool manufacturer's torque guidance and applicable industry standards for fastener assembly to ensure proper seating.