Used on end item nsn: 2320-01-530-3843; family of medium tactical vehicles, 5 ton m1087a1. 3b thread class right-hand flat countersunk head style 16 thread quantity per inch cadmium surface treated
2b thread class right-hand 24 thread quantity per inch nut, lock-machine screw hex serrated large washer head finish:zinc chromate; typical useage:sheet metal fasteners chromate zinc surface treated