2a thread class right-hand 3.000" thread length hexagon head style 13 thread quantity per inch procurement specification 4122v-4b-688 fig 2-16 unc thread series
3a thread class right-hand 40.0mm thread length dished hexagon head style 2.00mm hole diameter 22.00mm grip length 18 thread quantity per inch cadmium surface treated m thread series
3a thread class right-hand 0.749" thread length hexagon head style 0.070" hole diameter 20 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.451" thread length hexagon head style 2.985" grip length 32 thread quantity per inch passivate surface treated unf thread series