3a thread class right-hand 0.469" thread length flat countersunk head style 0.900" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.276" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.625" thread length hexagon head style 16 thread quantity per inch serrated flange on head cadmium surface treated unc thread series