2a thread class right-hand 1.063" thread length hexagon head style 20 thread quantity per inch one drilled hole 0.062 in. dia in head cadmium surface treated unc thread series
3a thread class right-hand 0.428" thread length flat countersunk head style 0.428" grip length 32 thread quantity per inch aluminum surface treated unjf thread series
2a thread class right-hand 0.362" thread length fillister head style 44 thread quantity per inch cadmium or zinc screw surface treated unf thread series