2a thread class right-hand 0.652" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.093" thread length flat countersunk head style 80 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.526" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unf thread series