Unit type millimeter.
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DIN 6797 A, UNI 8841 A serrated lock washers, external teeth
DIN 6797 J, UNI 8841 J serrated lock washers, internal teeth
DIN 6798 AJ, UNI 8842 AJ serrated lock washers, external teeth
DIN 6798 A, UNI 8842 A serrated lock washers, external teeth
DIN 6798 J, UNI 8842 J serrated lock washers, internal teeth
DIN 6798 V, UNI 8842 V countersunk toothed washers