What are Tab washers used for?
locking the nuts
A tab washer is a thin washer with a lug or tab that is bent against the side of the nut or the component after tightening.
This stops the nut from turning back, so it acts as a positive locking device for nuts and bolts.
It is not used to loosen nuts or to join structural fabrications; locking prevents loosening, whereas vibration itself is not removed by it.
Hence, locking the nuts.
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Important Questions from Fasteners
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