Heli-coil A1084-3CN075 Free Running Insert M3 X 0.5

Product Description

The HELI-COIL A1084-3CN075 is a free running threaded insert designed to create strong, wear-resistant internal threads in materials that are soft, stripped, or otherwise unable to hold a standard threaded fastener. Manufactured from 304 stainless steel with a bright, uncoated finish, this insert measures M3 x 0.5 in thread size and 7.5 mm (0.295 inches) in overall length, yielding a 2-1/2D length-to-diameter ratio. The tanged style allows for installation with a standard Heli-Coil insertion tool. Machinists, MRO technicians, and field service professionals install these inserts to restore or reinforce threaded holes in production and repair applications.

This insert is suited for metric coarse threaded applications where a durable, corrosion-resistant thread form is required. Common use cases include thread repair in aluminum housings, thin-walled components, and electronic enclosures. The M3 x 0.5 size is frequently encountered in small mechanical assemblies, instrumentation, and light industrial equipment. With 11-3/8 free coils, the insert provides full thread engagement across its installed length, distributing fastener load evenly through the parent material.

Key Features

• M3 x 0.5 metric coarse thread size for standard metric fastener compatibility
• 304 stainless steel construction for corrosion resistance and long service life
• 7.5 mm (0.295 inches) overall length with a 2-1/2D length-to-diameter ratio
• Tanged design for use with standard Heli-Coil insertion tooling
• 11-3/8 free coils for full load distribution across the installed thread
• Bright, uncoated finish - no additional surface treatment to affect tolerances

Compatibility

Designed as an OEM-style free running threaded insert for metric coarse M3 x 0.5 threaded holes in production, repair, and maintenance applications across a wide range of base materials.

Installation Notes

Installation requires a properly drilled and tapped Heli-Coil preparation hole and a compatible Heli-Coil insertion tool sized for M3 x 0.5 inserts. Power down or de-energize any equipment before drilling or tapping operations. After installation, break off the drive tang using a tang break-off tool; confirm the tang is fully removed from the hole before reassembly. Follow the manufacturer's preparation hole specifications to ensure proper insert fit and thread integrity.