2a thread class right-hand 0.875" thread length hexagon head style 1.125" grip length 18 thread quantity per inch chromate zinc surface treated unc thread series
3a thread class right-hand 1.500" thread length hexagon head style 11 thread quantity per inch navy special project zinc surface treated unc thread series
3a thread class right-hand 0.531" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated mark head w/letters cn unf thread series
Used on m551 vehicle family. 3a thread class right-hand 0.230" thread length button head style 32 thread quantity per inch cadmium surface treated unf thread series
