3a thread class right-hand 0.323" thread length flat countersunk head style 0.115" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.250" thread length pan head style 32 thread quantity per inch passivate screw surface treated altered item unc thread series
3a thread class right-hand 0.222" thread length flat chamfer head style 32 thread quantity per inch altered item passivate surface treated unc thread series