Failure of a threaded assembly through self-loosening not only risks lost production but also worker safety, a situation an Australian mining operation faced when M36 anchor bolts threatened the collapse of the jaw crusher equipment frame.
The bolts had been locked by spring washers which simply could not rise to the challenge of securing bolts on a piece of equipment subjected to continuous vibration and high shear forces. This resulted in the loosening – and ultimately the breaking off – of anchor bolts and the collapse of concrete footings.













