2a thread class right-hand 1.639" thread length fillister head style 0.070" hole diameter 18 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 2.000" thread length hexagon head style 12.312" grip length 20 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.511" thread length dished hexagon head style 1.938" grip length 18 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.316" thread length dished hexagon head style 5.125" grip length 28 thread quantity per inch cadmium surface treated unf thread series