3a thread class right-hand 0.343" thread length hexagon head style 1.000" grip length 24 thread quantity per inch cadmium threads surface treated unf thread series
3a thread class right-hand 0.359" thread length hexagon head style 0.500" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.343" thread length hexagon head style 1.250" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.327" thread length hexagon head style 0.625" grip length 28 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.283" thread length flat countersunk head style 28 thread quantity per inch phosphate screw surface treated as differentiated by special test features unf thread series