Heli-coil A1084-8CN240 Free Running Insert M8 X 1.25

Product Description

The HELI-COIL A1084-8CN240 is a tanged, free-running wire thread insert designed to create or restore a strong internal metric thread in a parent material. The insert measures M8 x 1.25 with an overall length of 0.9449 inches (24 millimeters), corresponding to a 3D length-to-diameter ratio. Constructed from 304 stainless steel with a bright, uncoated finish, it delivers corrosion resistance without surface treatments that could affect thread tolerances. With 16-1/8 free coils, this insert expands into a tapped hole and locks in place, providing a durable threaded anchor. Licensed mechanics, maintenance technicians, and assembly professionals install these as part of thread repair or engineered thread reinforcement operations.

Free-running inserts are used in applications where standard torque and vibration loads apply and no locking feature is required. This insert is suited for residential and commercial equipment assembly, automotive components, machinery frames, and industrial housings where stripped or weak threads in aluminum, cast iron, or other softer parent materials need to be restored or reinforced to a full metric coarse thread specification. It installs using a standard HELI-COIL installation tool matched to the M8 x 1.25 thread size.

Key Features

• M8 x 1.25 metric coarse thread - creates a precise, durable internal thread in the parent material
• 24 millimeter overall length with a 3D length-to-diameter ratio for deep thread engagement
• 304 stainless steel construction provides corrosion resistance in demanding service environments
• Tanged design allows controlled installation and seating depth with a standard installation tool
• Bright, uncoated finish maintains tight thread tolerances without added surface buildup
• 16-1/8 free coils distribute load evenly across the full insert length

Compatibility

Designed for use as a free-running thread insert in any parent material tapped to the M8 x 1.25 metric coarse thread standard using the appropriate HELI-COIL tap and installation tool set.

Installation Notes

Installation is performed by machinists, maintenance technicians, or assemblers using the correct HELI-COIL tap to prepare the parent hole, followed by the matched M8 x 1.25 installation tool to drive the insert to the proper depth. After installation, the drive tang must be broken off using a tang break-off tool where blind holes are used. Ensure the parent material is securely fixtured before tapping to maintain hole alignment. Always follow the thread insert manufacturer's tap drill size chart to achieve proper installed thread tolerances.