Heli-coil A3585-12CN750 Screw-locking Insert 3/4-10 Unc

Product Description

The HELI-COIL A3585-12CN750 is a tangless screw-locking helical coil insert designed to create strong, vibration-resistant threaded connections in parent materials that require durable thread repair or reinforcement. Made from Grade 304 stainless steel with a bright finish, this insert accepts a 3/4-10 UNC thread and provides a locking function that resists loosening under dynamic loads. The 1D length-to-diameter ratio translates to an overall installed length of 0.75 inches, making it well-suited for applications where fastener depth is limited. Maximum locking torque is rated at 400 inch-pounds, with a minimum breakaway torque of 60 inch-pounds. Machinists, maintenance technicians, and MRO professionals install this type of insert during thread repair and OEM production assembly.

This insert is used in industrial, commercial, and OEM manufacturing environments where a 3/4-10 UNC internal thread must be established or restored in metal components. The tangless design eliminates the need for tang removal after installation, streamlining the installation process and reducing the risk of debris left in blind holes. The Grade 304 stainless steel construction makes it appropriate for applications exposed to moisture, mild chemicals, or elevated temperatures where corrosion resistance is a priority. Typical end-use contexts include heavy equipment, structural assemblies, and precision machinery requiring reliable thread integrity.

Key Features

• Tangless design eliminates post-installation tang removal for faster, cleaner installation in blind or through holes
• Grade 304 stainless steel construction provides corrosion resistance in wet or chemically exposed environments
• Maximum locking torque of 400 inch-pounds resists fastener loosening under vibration and dynamic loading
• Minimum breakaway torque of 60 inch-pounds confirms secure locking engagement without permanent seizure
• 1D length-to-diameter ratio at 0.75 inches overall length suits shallow boss and thin-wall applications
• Bright finish with a maximum outside diameter of 0.906 inches and minimum of 0.881 inches for consistent fit

Compatibility

Designed for installation into parent material tapped to accept a 3/4-10 UNC helical insert, requiring the appropriate HELI-COIL tap and installation tool for the tangless insert series. Verify parent material thread preparation meets the required tap drill and insert tap specifications before installation.

Installation Notes

Installation is performed by machinists or maintenance technicians using the correct tangless insert installation tool matched to the 3/4-10 UNC thread size. The parent material must be drilled and tapped with the proper insert tap before the coil is driven in. Ensure the work area is clear of chips and debris before inserting the coil into a blind hole. Do not use standard thread taps in place of the required insert tap, as this will result in incorrect fit and reduced holding strength.