Metric external tooth Stamping lock washers are stamped parts designed to better reduce bolt and screw loosening from their mating assemblies. The spring tension on this washer tooth creates pressure against the fastener threads and mating parts to prevent loosening. They are available in steel, stainless, brass, bronze, and many other metals. They are available in standard and metric sizes. Extrinsic means that the teeth are on the outside.
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