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The HELI-COIL 17551-06 is a crank-style hand installation tool designed for driving tangless thread inserts into prepared holes. It is built for use with 6-32 UNC thread inserts and provides the manual control needed to seat inserts accurately without power tools. Technicians use this tool to install helical wire thread inserts into metals, plastics, or composite materials where a durable threaded repair or thread reinforcement is required. The crank-style handle delivers consistent torque and tactile feedback during installation, reducing the chance of cross-threading or over-driving the insert.
This tool is suited for bench work and field repair across multiple trades, including HVAC, electrical, and general mechanical service. It is particularly useful when working in tight spaces or in situations where a power installation tool is impractical. The 6-32 UNC size makes it a common choice for light-gauge fastener applications found in control boards, electrical enclosures, and small equipment housings. Installation is performed by hand, making it accessible for low-volume insert work without additional equipment.
Designed for use with tangless helical wire thread inserts in the 6-32 UNC thread size. Refer to HELI-COIL insert product lines for compatible insert part numbers.
This tool is intended for hand installation of tangless thread inserts and should be used after the receiving hole has been properly drilled and tapped to the correct HELI-COIL specification for the target thread size. Ensure the workpiece is secure before driving the insert. Do not apply excessive force through the crank handle, as this can distort the insert or damage the tapped hole. No electrical isolation or system shutdown is required for use of this hand tool in a shop or bench setting.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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