Heli-coil R1084-3 Free Running Insert M3 X 0.5 12 Pack

Product Description

The HELI-COIL R1084-3 is a free running threaded insert designed to create or restore strong, wear-resistant internal threads in a tapped hole. Manufactured from stainless steel with a bright uncoated finish, this insert measures M3 x 0.5 thread size with an overall length of 4.5 mm, yielding a 1-1/2D length-to-diameter ratio. The tanged design allows installation with a standard HELI-COIL driving tool, which winds the coil into a prepared threaded hole. Machinists, maintenance technicians, and assembly professionals install these inserts in metal, plastic, and composite workpieces where thread repair or thread reinforcement is required.

This insert is suited for applications demanding a permanent, vibration-resistant internal thread in components subject to repeated fastener engagement. The metric coarse M3 x 0.5 specification makes it a common choice for light hardware assemblies, electronics enclosures, small engine components, and precision instrument housings. Each package contains 12 inserts, supporting multiple repair or production operations from a single order.

Key Features

• M3 x 0.5 metric coarse thread for compatibility with standard M3 fasteners
• 4.5 mm overall length at a 1-1/2D length-to-diameter ratio for balanced thread engagement
• Stainless steel construction resists corrosion and wear over repeated use
• Tanged design accepts standard HELI-COIL installation tools for controlled seating
• 6-3/8 free coils provide consistent spring tension and secure locking in the parent material
• Bright uncoated finish suitable for applications where coating contamination must be avoided
• Package of 12 inserts per order

Compatibility

Designed as an OEM-style free running threaded insert for M3 x 0.5 metric coarse tapped holes prepared to HELI-COIL specifications; requires a matching installation tool and correctly sized tap for proper fitment.

Installation Notes

Installation is performed by machinists or maintenance technicians using a HELI-COIL tap to prepare the host hole to the correct oversize diameter before driving the insert. Power down or de-energize any associated equipment before performing thread repair on installed assemblies. Use the manufacturer-specified driving tool to wind the insert flush or slightly below the surface of the parent material. After seating, break off the installation tang using a tang break-off tool where clearance requires removal.