Heli-coil 3695-04 Tang Break Off Tool 4-40 4-48 5-40

Product Description

The HELI-COIL 3695-04 is a tang break off tool designed for use with 4-40, 4-48, and 5-40 thread inserts. After a helical wire insert is driven into a tapped hole, a tang remains attached at the bottom of the insert. This tool snaps that tang cleanly at the notch without damaging the newly installed insert or the surrounding material. It is compatible with both UNC and UNF thread standards. Technicians across mechanical assembly, HVAC equipment service, and industrial maintenance use this tool as part of a standard Heli-Coil insert installation workflow. It weighs 0.5 pounds and is sized for small-diameter thread applications.

This tool is used wherever 4-40, 4-48, or 5-40 wire thread inserts are installed into tapped holes in aluminum, steel, magnesium, or other base materials. Typical applications include repair of stripped threads in compressor housings, control panels, electrical enclosures, and light mechanical assemblies. It is a required step tool when the insert design includes a drive tang that must be removed after installation to clear the thread bore for fastener engagement.

Key Features

• Designed specifically for 4-40, 4-48, and 5-40 thread insert sizes
• Compatible with both UNC and UNF thread standards
• Snaps the installation tang cleanly at the break-off notch without insert distortion
• Part of the standard Heli-Coil installation tool set for small-diameter inserts
• Compact and lightweight at 0.5 pounds for easy handling in tight spaces

Compatibility

Designed for use with Heli-Coil wire thread inserts in 4-40, 4-48, and 5-40 thread sizes conforming to UNC and UNF thread standards.

Installation Notes

This tool is used by machinists, HVAC technicians, and mechanical service professionals as the final step of the thread insert installation process. Ensure the insert is fully seated to the correct depth before applying the tang break off tool. Apply firm, controlled downward force to snap the tang at the notch - do not use a hammer or impact tool, as this may displace the insert. Refer to the insert manufacturer's installation instructions for proper drive tool and tap selection prior to reaching the tang removal step.