3a nut thread thread class right-hand nut thread 0.562" nut thread thread length 1.597" overall length 18 stud thread thread quantity per inch no.9 stamped on large end to indicate 0.009 in.oversize pitch dia cadmium surface treated stepped unc stud thread thread series
2a thread class right-hand 0.125" thread length flat countersunk head style 56 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.178" thread length flat chamfer head style 32 thread quantity per inch passivate or paint screw surface treated hole drilled unef thread series
3a thread class right-hand 0.512" thread length flat countersunk head style 24 thread quantity per inch cadmium screw surface treated unf thread series