3a thread class right-hand 0.210" thread length flat countersunk head style 48 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.338" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.316" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.316" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unf thread series
2a thread class right-hand 0.667" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated unf thread series