2a thread class right-hand 0.875" thread length hexagon head style 1.125" grip length 18 thread quantity per inch cadmium or zinc surface treated unc thread series
3a thread class right-hand 0.669" thread length double hexagon w/hole head style 0.055" hole diameter 2.365" grip length 20 thread quantity per inch navy special project cadmium surface treated unjf thread series