Heli-coil A1084-20CN300 Free Running Insert M20 X 2.5

Product Description

The HELI-COIL A1084-20CN300 is a tanged, free running wire thread insert designed to install and restore metric coarse internal threads in metal parent materials. Manufactured from 304 stainless steel with a bright, uncoated finish, this insert accepts an M20 x 2.5 thread and measures 1.1811 inches (30 mm) in overall length, placing it in the 1-1/2D length-to-diameter category. Free running inserts allow standard fasteners to thread through without interference, making them suitable for general-purpose thread repair and thread reinforcement applications. Installation is performed by licensed mechanics, maintenance technicians, and MRO professionals using a dedicated HELI-COIL installation tool.

This insert is used in thread repair and thread reinforcement applications across industrial, mechanical, and manufacturing environments. It suits situations where an M20 x 2.5 metric coarse thread has been stripped, damaged, or needs upgrading in a softer parent material such as aluminum or cast iron. The 30 mm overall length and 9-7/8 free coils provide consistent thread engagement depth appropriate for standard fastener loads in both light and heavy assemblies. This single-insert package is suited for low-volume repair work or replacement stock.

Key Features

• M20 x 2.5 metric coarse thread size for broad fastener compatibility
• 30 mm (1.1811 inches) overall insert length at a 1-1/2D length-to-diameter ratio
• 304 stainless steel construction for corrosion resistance in service environments
• Tanged design for controlled installation with standard HELI-COIL insertion tools
• Bright, uncoated finish with 9-7/8 free coils for consistent thread form
• Free running style allows standard fastener engagement without interference fit

Compatibility

Designed as an OEM-style thread repair insert for parent materials tapped to accept an M20 x 2.5 metric coarse HELI-COIL insert using the corresponding installation tool and tap size specified for this insert series.

Installation Notes

Installation requires drilling out the damaged thread to the correct oversize diameter, tapping the bore with the specified HELI-COIL tap, and driving the insert with the matching installation tool. Power down or de-energize any equipment and relieve all mechanical loads before beginning thread repair work. After installation, remove the tang using a tang break-off tool where access allows. Follow the tool manufacturer's installation instructions for proper coil seating depth and tang removal procedure.