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Lock washer S Spring steel with mechanically applied zinc coating (≤ dia. 3.5 zinc-plated, blue passivated)
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The Belleville washer shape achieves an optimum friction fit with simultaneous form fit via the helical gearing
It makes sense in many cases – primarily when using short screws and loads which are vertical to the screw axis – to prevent the connection loosening by using lock washers to supplement the pre-tensioning force.
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