How to Install a Huck Bolt

A Huck bolt, also known as a torque bolt, is a bolt designed to be used in connections that may suffer from high vibration or stress. The nut of the bolt is installed using a pneumatic tool. When the nut passes over the thin waist in the middle of the bolt and comes flush with the connection plate, the reverse torque on the bolt causes it to snap off at the waist, creating a vibration-proof "lock" on the nut. It may sound complicated, but with the right tools, you can install a Huck bolt in seconds.

Use Huck bolts for high-vibration connections.

Step 1

Attach the bolt nose to your pneumatic tool and then connect the tool to your compressor. Make sure you follow the instructions included with your make and model of tool to prevent the nose from coming loose when in use.

Step 2

Push the Huck bolt through the two metal pieces to be connected. Make sure the bolt extends through to an area that you can comfortably access with the pneumatic gun. The bolt must extend far enough through the hole for the waist to be visible on the other side.

Step 3

Hand spin the nut onto the end of the Huck bolt just far enough so it will not fall off.

Step 4

Place the nose of your pneumatic tool over the bolt and nut and make sure the nut sits flush in the nose. Press the trigger of the pneumatic tool and hold it as it spins the nut on. Apply gentle pressure on the gun, just enough to follow the bolt down the threads. When the bolt is flush to the connection, the bolt will snap off at the middle.

Step 5

Release the pressure on the trigger to turn off the pneumatic tool and pull the nose away from the connection. Discard the broken end of the bolt.


  • Be careful to tilt the nose slightly upward when pulling it away from the connection. A falling bolt piece can cause serious injury to anyone struck by it, not just because it is falling metal, but it will be hot from the nut spinning on it; it can cause severe burns.