2a thread class right-hand 2.062" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.656" thread length hexagon head style 1.688" grip length 20 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.782" thread length hexagon head style 1.562" grip length 20 thread quantity per inch cadmium surface treated unf thread series