external/internal serrated tooth washer M2.5-m64 Standard:DIN125,DIN9021,DIN126,DIN440,DIN433,DIN7349,DIN7989,BS4320,USS/SAE all serrated ... tooth Washers1) Standard: DIN125, DIN9021, DIN126, DIN440, DIN433, DIN7349, DIN7989, BS4320, USS/SAE, NFE25513, NFE25514 ...