Heli-coil A1185-3CN285 Free Running Insert 10-24 Unc

Product Description

The HELI-COIL A1185-3CN285 is a free running helical wire thread insert designed to create or restore strong, wear-resistant internal threads in parent materials that are too soft or damaged to hold threads reliably on their own. This insert is configured for 10-24 UNC thread size and measures 0.285 inches in overall length, corresponding to a 1-1/2D length-to-diameter ratio. It is made from 304 stainless steel with a bright, uncoated finish, providing solid corrosion resistance for use in demanding environments. The tanged design allows installation with a standard HELI-COIL style insert driver. Machinists, maintenance technicians, and mechanical assemblers install these inserts in production and repair applications.

This insert is used wherever a 10-24 UNC threaded hole needs to be reinforced or repaired in base materials including aluminum, magnesium, cast iron, plastics, and other materials that cannot sustain full thread loads on their own. Typical applications include aerospace assembly, industrial machinery repair, automotive components, and general mechanical maintenance. The 304 stainless steel construction makes it suitable for environments with mild corrosive exposure. With 5 free coils, the insert distributes thread load evenly across the engagement length, reducing stress concentration at any single point in the threaded joint.

Key Features

• 10-24 UNC thread size for standard unified coarse thread applications
• 0.285 inch overall length with 1-1/2D length-to-diameter ratio
• 304 stainless steel construction for corrosion resistance
• Tanged design for use with standard HELI-COIL installation drivers
• 5 free coils for even load distribution across the thread engagement
• Bright, uncoated finish - no coating thickness to account for in tolerance stack

Compatibility

Designed as an OEM-style free running insert for use in any 10-24 UNC tapped hole prepared to HELI-COIL specification dimensions for a 1-1/2D insert installation.

Installation Notes

Installation requires a properly tapped hole using the correct HELI-COIL tap for the 10-24 1-1/2D application. Use the appropriate HELI-COIL insert tool to drive the insert to the correct depth, typically one quarter to one half turn below the top of the hole. After installation, remove the drive tang using a tang break-off tool where required by the application. Follow the manufacturer installation procedure for thread gauging to confirm the finished thread meets tolerance before assembly.