Duplex-Steel Spring Washers is a ring split at one point and bent into a helical shape.
These Spring Washers also known as Split Washers, causes the washer to exert a spring force between the fastener's head and the substrate, which keeps up the Duplex-Steel Lock Washer hard against the substrate and the fastener thread hard against the nut or substrate thread, making more friction and resistance to rotation.
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