3a thread class right-hand 0.928" thread length flat countersunk head style 0.740" grip length 18 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.928" thread length flat countersunk head style 0.615" grip length 18 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.371" thread length flat countersunk head style 28 thread quantity per inch navy special project cadmium surface treated unjf thread series
3a thread class right-hand 0.251" thread length pan head style 0.178" grip length 32 thread quantity per inch altered item of NAS1133 unf thread series
2a thread class right-hand 0.469" thread length flat chamfer head style 28 thread quantity per inch 0.062 in. thread relief cadmium surface treated unf thread series