0.322" hole diameter 0.512" outside diameter 0.050" material thickness no internal key, 2 keys equally spaced on washer face, 0.058 in. wide by 0.034 in. high, 42 equally spaced serrations on face opposite keys cadmium surface treated internal prebent key
0.567" hole diameter 0.880" outside diameter 0.055" material thickness no internal key; 2 keys equally spaced on washer face, 0.114 in. wide by 0.057 in. high; 56 equally spaced serrations on face opposite keys cadmium surface treated internal prebent key