3a thread class right-hand 0.501" thread length flat countersunk head style 3.740" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.781" thread length flat countersunk head style 0.8900" grip length 20 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.578" thread length flat countersunk head style 24 thread quantity per inch cadmium or cadmium screw surface treated unjf thread series