1.250" hole diameter 3.745" outside diameter 0.232" material thickness navy special project od edge opposite shoulder chamfered 20 degrees by 0.375 in. 0.070 in. dia hole, thru shoulder od to washer id, 3 grooves on washer face, 0.062 in. wide by 0.016 in. deep, 1.563 in. dia, 2.062 in. dia, 2.563 in. dia shouldered