Heli-coil A4649-10CN200 Free Running Insert M10 X 1.25

Product Description

The HELI-COIL A4649-10CN200 is a tanged, free running wire thread insert designed to create strong, wear-resistant internal threads in tapped holes. Manufactured from 304 stainless steel with a bright, uncoated finish, this insert measures M10 x 1.25 metric fine thread with an overall length of 20 millimeters (0.787 inches), yielding a 2D length-to-diameter ratio. With 13-1/8 free coils, it installs into a prepared STI-tapped hole to restore or reinforce thread integrity in metal, plastic, or composite workpieces. Licensed machinists, maintenance mechanics, and field technicians across HVAC, plumbing, and industrial equipment service rely on these inserts for durable thread repair and new-part thread reinforcement.

This insert suits metric fine thread applications in M10 x 1.25 bores. It is appropriate for use in aluminum, cast iron, magnesium, and other materials where the parent thread may strip, corrode, or require added strength. The 2D insert length is a standard choice for moderate-load fastener joints where greater thread engagement than a 1D insert is needed. Single-insert packaging allows for individual replacements or small-batch jobs without excess inventory.

Key Features

• M10 x 1.25 metric fine thread for precision fastener applications
• 20 millimeter overall length with 2D length-to-diameter ratio for solid thread engagement
• 304 stainless steel construction resists corrosion and withstands elevated service temperatures
• Tanged design facilitates installation with a standard HELI-COIL or compatible insertion tool
• 13-1/8 free coils provide full thread form across the insert length
• Bright, uncoated finish suitable for general-purpose and non-decorative installations

Compatibility

Designed for use in STI (Screw Thread Insert) tapped holes sized for M10 x 1.25 metric fine thread applications. Consult the HELI-COIL installation tool and tap specification charts to confirm correct drill, tap, and insertion tool selection for the parent material.

Installation Notes

Installation requires a properly sized STI tap and a compatible tanged insertion tool; do not attempt to drive the insert without the correct tooling, as coil damage or improper seating will result. After inserting the coil to the specified depth, break off the installation tang using a tang break-off tool applied at the notch. Always de-energize and lock out any equipment before performing thread repair on live machinery components. Follow applicable facility maintenance and safety codes for the work environment.