3a thread class right-hand 0.399" thread length flat countersunk head style 28 thread quantity per inch cadmium or cadmium screw surface treated internal drive ribbed unjf thread series
2a thread class right-hand 0.699" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.148" thread length flat countersunk head style 28 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.314" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjf thread series