2a thread class right-hand 0.484" thread length hexagon head style 0.062" hole diameter 24 thread quantity per inch thread end chamfered 0.031 in. lg by 45 deg angle, 0.078 in. lg, 0.297 in. dia undercut between thread phosphate surface treated unf thread series
right-hand 0.844" thread length flat chamfer head style 16 thread quantity per inch 0.707 in. dia by 0.343 in. wide thd relief between shoulder cadmium or zinc surface treated unf thread series
2a thread class right-hand 0.562" thread length hexagon head style 20 thread quantity per inch undercut from head end 0.703 in. make 0.500 in. dia. by 0.203 in. wide counterbore threaded unf thread series
3a thread class right-hand 0.688" thread length bevel-conical head style 24 thread quantity per inch 4 drilled holes cadmium surface treated unf thread series
3a thread class right-hand 0.563" thread length bevel-conical head style 24 thread quantity per inch cadmium or chromium surface treated unf thread series