Fix Nut Bolt Clamp is mainly used to keep a joint together when vibration causes the bolt to unwind from the threads. This clamp or clip can be reinforced and kept together by having an extra washer spot welded at the screw fixing area. This is very easy to install and safe to use. Fix Nut Bolt Clamp is a bolted joint clamp with special threads that can help prevent bolt unwinding and vibration. To ensure that the nut is properly tightened, use a countersunk head that fits flush with the surface.