Heli-coil A3585-3CNW285 Screw-locking Insert 10-24 Unc

Product Description

The HELI-COIL A3585-3CNW285 is a tangless screw-locking helical wire insert designed to create strong, vibration-resistant threaded holes in parent materials that require reliable fastener retention. Manufactured from Grade 304 stainless steel with a dry film lubricant finish, this insert accepts a 10-24 UNC mating thread and measures 0.285 inches in overall length at a 1-1/2D length-to-diameter ratio. The locking feature is built into the coil geometry, providing a controlled prevailing-torque fit that resists loosening under dynamic loads. Installation is performed by machinists, maintenance technicians, and assembly professionals working on metal fabrication, equipment repair, and precision mechanical assemblies.

This insert is suited for applications where thread stripping, corrosion exposure, or repeated fastener cycling demands a reinforced internal thread. The tangless design eliminates the need for tang removal after installation, reducing assembly steps and preventing loose tang fragments inside assemblies. Common use cases include aerospace component repair, industrial equipment maintenance, and precision instrument manufacturing where stainless steel corrosion resistance and controlled locking torque are required specifications.

Key Features

• Tangless design eliminates post-installation tang removal and prevents debris contamination
• Grade 304 stainless steel construction provides corrosion resistance in demanding service environments
• Dry film lubricant finish supports controlled installation torque and consistent locking performance
• Maximum locking torque of 13 inch-pounds with a minimum breakaway torque of 2.00 inch-pounds
• 5 free coils provide even load distribution across the threaded engagement zone
• Outside diameter range of 0.244 to 0.259 inches for accurate fit in standard Heli-Coil tapped holes

Compatibility

Designed as a screw-locking wire thread insert for use in standard 10-24 UNC tapped holes prepared to Heli-Coil tangless insert specifications. Consult the applicable installation tool and tap drill chart for correct parent-material hole preparation.

Installation Notes

Installation requires a correctly sized Heli-Coil tangless insert tool matched to the 10-24 UNC thread size. The parent material hole must be tapped using the specified Heli-Coil tap to achieve the correct minor diameter before insert installation. Ensure all chips and debris are cleared from the tapped hole prior to driving the insert. No tang extraction step is required with tangless inserts, but verify full seating depth before assembling the mating fastener.