2a thread class right-hand 0.168" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.314" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unjf thread series
2a thread class right-hand 0.643" thread length oval countersunk head style 32 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.453" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unjf thread series