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    DIN 6797 TYPE A For a moderate clamping, the use of these washers is recommended for use on flat surfaces and when the bearing surface is greater than the external diameter of the washer. DIN 6797 TYPE J For a moderate clamping, the use of these washers
    DIN 6798 Type A Serrated lock washers, external teeth DIN 6798 Type J Serrated lock washers, internal teeth DIN 6798 Type V Countersunk toothed washers