2a thread class right-hand 2.000" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.964" thread length flat countersunk head style 56 thread quantity per inch navy special project cadmium screw surface treated unc thread series
2a thread class right-hand 0.514" thread length drive head style 32 thread quantity per inch passivate screw surface treated head with molded washer, nylon per mil-m-20693; epoxy coated head unf thread series