For securing of screw connections against loosening
Advantages:
Bolle verende ring met kartelrand aan de bovenzijde
Advice
Hardness: 420 - 510HV
Shape M = with medium outside diameter
This washer only has contact grooves on the upper side. Due to the missing of toothing on the underside, no contact can be made with the base metal. Therefore, this disc is not conductive.
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