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 centre flare of the bolt and comes flush with the connection plate, the reverse torque on the bolt itself causes it to snap off at the flare middle 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. There is no need for a torque wrench or torque specifications. The bolt will snap when it is under the correct tension.
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Things you need
- Pneumatic tool with Huck bolt nose
- Air compressor
- Huck bolt locking collar (optional)
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.
Push the Huck bolt through the two metal pieces to be connected. Make sure the bolt is extending through to an area that you can comfortably access with the pneumatic gun.
Hand spin the nut onto the end of the Huck bolt just far enough so it will not fall off.
Place the nose of your pneumatic tool over the bolt and nut and make sure the nut is sitting 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 flare in the middle.
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.
Tips and warnings
- Use a specially designed tab locknut for areas subject to extremely high vibration. When the bolt snaps, the tab is engaged and provides additional anti-vibration protection.
- 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 and can also cause severe burns.
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