Heli-coil A1084-12CN120 Free Running Insert M12 X 1.75

Product Description

The HELI-COIL A1084-12CN120 is a free running wire thread insert designed to create strong, wear-resistant threads in drilled and tapped holes. Built from 304 stainless steel with a bright, uncoated finish, this insert accepts an M12 x 1.75 metric coarse thread and measures 12 millimeters in overall length (approximately 0.472 inches), giving it a 1D length-to-diameter ratio. It ships with a tang for installation with a standard Heli-Coil driver tool. Machinists, maintenance technicians, and industrial mechanics install these inserts to restore or reinforce threaded holes in aluminum, cast iron, and other base materials.

This insert is suited for applications in manufacturing, heavy equipment maintenance, automotive repair, and general industrial MRO work wherever a metric M12 x 1.75 coarse thread must be established or repaired. The free running design allows normal thread engagement without locking torque, making it appropriate for fasteners that require routine removal and reinstallation. The stainless steel construction provides good corrosion resistance and durability in service environments where carbon steel inserts would degrade.

Key Features

• M12 x 1.75 metric coarse thread profile for standard fastener compatibility
• 304 stainless steel construction for corrosion resistance and long service life
• 12 mm overall length with a 1D length-to-diameter ratio for compact thread engagement
• Tanged design for use with standard Heli-Coil installation driver tools
• Free running configuration allows unrestricted fastener engagement and removal
• Bright, uncoated finish - no coating interference with thread tolerances

Compatibility

Designed as a standard free running insert for M12 x 1.75 metric coarse tapped holes prepared with the appropriate Heli-Coil tap and installation tool set.

Installation Notes

Installation is performed by drilling the damaged or new hole to the specified Heli-Coil tap drill size, tapping with the correct Heli-Coil M12 x 1.75 tap, and driving the insert using a compatible Heli-Coil installation tool until the leading coil sits one-half to one turn below the surface. After seating, the tang is broken off using a tang break-off tool. Always cut power or de-energize equipment before working on threaded fastener locations in live assemblies, and follow applicable facility safety procedures.