0.503" hole diameter navy special project 2 projections equally spaced on washer face, 0.125 in. wide by 0.086 in. high; 2 holes 0.043 in. dia, thru washer periphery
0.375" hole diameter H2 equally spaced projections extending from bearing surface each side of centrally located hole 0.125 in. wide by 0.188 in. high; 2 holes 0.043 in. dia, thru washer periphery