Heli-coil 7751-3.5 Thread Insert Installation Tool M3.5

Product Description

The HELI-COIL 7751-3.5 is a hand installation tool designed for driving threaded wire inserts into tapped holes. This Type II Prewinder style tool winds the insert onto the mandrel before installation, allowing the technician to load and drive the insert in a single controlled motion. Built for M3.5 x 0.60 metric coarse thread inserts, it is used in precision fastening and thread repair applications across manufacturing, maintenance, and field service environments. The prewinder body diameter measures 3/8 inch and the spinner diameter is 2-9/32 inches, giving the tool good grip and control during hand operation.

This tool is suited for shops and field technicians working with HELI-COIL wire thread inserts in metric coarse thread sizes. It is commonly used in automotive, aerospace, and general industrial repair where stripped or damaged threads are restored using stainless steel wire inserts. The 4-5/8 inch prewinder length provides sufficient reach for most standard-depth applications. It is appropriate for use wherever M3.5 x 0.60 inserts are being installed by hand without power tooling.

Key Features

• Type II Prewinder design loads the insert onto the mandrel before driving for cleaner, more consistent installation
• Sized specifically for M3.5 x 0.60 metric coarse thread inserts
• Prewinder body diameter of 3/8 inch for compact fitment in tight spaces
• Spinner diameter of 2-9/32 inches provides hand torque control during installation
• Prewinder length of 4-5/8 inches accommodates standard tapped hole depths
• Hand-operated tool requires no power source, suitable for field and bench use

Compatibility

Designed for use with HELI-COIL wire thread inserts in M3.5 x 0.60 metric coarse thread specifications. Consult the HELI-COIL insert series documentation to confirm insert compatibility before use.

Installation Notes

This tool is typically used by machinists, maintenance technicians, and assembly workers performing thread repair or insert installation. Before beginning, ensure the tapped hole meets the HELI-COIL specified tap drill size and thread form for M3.5 x 0.60. Load the insert onto the prewinder mandrel per the tool instructions before driving. Do not force the tool if resistance is felt, as cross-threading can damage both the insert and the parent material.