Heli-coil A1185-04CN112 Free Running Insert 4-40 0.112in

Product Description

The HELI-COIL A1185-04CN112 is a free running wire thread insert designed to create or restore strong, wear-resistant internal threads in parent materials that require a durable threaded anchor. This insert accepts a 4-40 UNC thread and measures 0.112 inches in overall length, corresponding to a 1D length-to-diameter ratio. Manufactured from 304 stainless steel with a bright, uncoated finish, it delivers corrosion resistance suited to demanding service environments. The tanged design allows installation with a standard HELI-COIL installation tool, and the 2-3/4 free coil count ensures consistent thread engagement across the insert length. Licensed HVAC, industrial, and mechanical technicians install these inserts when repairing stripped or damaged threaded holes in metal components.

This insert is used in applications where a 4-40 UNC internal thread must be installed or restored in aluminum, cast iron, magnesium, or other parent materials prone to thread wear or pull-out. The 1D length-to-diameter ratio suits compact fastening locations with limited material depth. Common install scenarios include control panel housings, equipment frames, motor mounting surfaces, and other precision assemblies where thread integrity directly affects component retention and safety.

Key Features

• 4-40 UNC thread size for compatibility with standard 4-40 fasteners
• 0.112 inches overall insert length with a 1D length-to-diameter ratio
• 304 stainless steel construction for corrosion resistance
• Tanged design for positive installation tool engagement
• Bright, uncoated finish with no added coating to affect thread tolerances
• 2-3/4 free coils for consistent thread form and load distribution

Compatibility

Designed as an OEM-style free running insert for use in any parent material tapped to accept a 4-40 UNC HELI-COIL style thread insert.

Installation Notes

Installation requires a HELI-COIL series tap to prepare the parent hole to the correct insert-ready diameter before the insert is driven in. Power down or de-energize any assembly before performing thread repair work on live electrical or control components. Use the appropriate HELI-COIL installation tool to drive the insert to the correct depth without over-driving. After installation, break off the tang using a tang break-off tool where required by the assembly specification.