3a thread class right-hand 0.491" thread length flat countersunk head style 0.678" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.338" thread length pan head style 0.062" grip length 32 thread quantity per inch two keyways along threads 180 degrees apart; width of keyways 0.040 in. min. to 0.050 in. max passivate surface treated unc thread series
3a thread class right-hand 0.338" thread length flat countersunk head style 0.365" grip length 32 thread quantity per inch passivate surface treated unjf thread series