Used on ch-53a/d/e;ch-53 helicopter. 0.612" inside diameter 0.612" center hole diameter CEC4-5812 two .020 x .020 notches 180 deg apart; inter ring is 6 sided
Used on launcher,rocket,armored vehicle mounted multiple rocket system (mlrs),surface to air missiles nsn 1055014504243. 1.278" center hole diameter ring, mating heat treat per mil-h-6875 for hrc 58
Used on satellite communication control center nsn 5895014464137. 0.281" hole diameter 14.000" overall length 14.000" overall width 4 bolt hole quantity gasket, blower 6 0.265 inch bolt holes on 6.81 inch radius circle from center; 1.14x.52 retangular opening offset 1.44 inch from one corner non-circular