3a thread class right-hand 0.515" thread length double hexagon head style 3.990" grip length 16 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.515" thread length double hexagon head style 4.115" grip length 16 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 1.250" grip length 32 thread quantity per inch unc thread series
3a thread class right-hand 0.349" thread length flat countersunk head style 0.678" grip length 24 thread quantity per inch cadmium surface treated unjf thread series