Used on propeller onboard 378 ft whec coast guard vessels. 3a thread class right-hand 3.250" thread length hexagon head style 20 thread quantity per inch un thread series
2a thread class right-hand 0.560" thread length hexagon head style 24 thread quantity per inch altered from MS35308-338 passivate surface treated unf thread series
3a thread class right-hand 0.555" thread length hexagon head style 20 thread quantity per inch concentric hole in head dia. 0.250 in.; depth of hole 0.650 in. unjf thread series
2a thread class right-hand 0.210" thread length hexagon head style 32 thread quantity per inch navy special project paint fed std 595 color no. 37033 cadmium threads surface treated unf thread series
3a thread class right-hand 0.700" thread length double hexagon w/hole head style 24 thread quantity per inch one hole in undercut 0.1255 in. dia max unjf thread series
