Used on mc-130e. 3a thread class right-hand 2.038" thread length ball head style 20 thread quantity per inch head is round with hex base:dia is 0.875 x.250 unjf thread series
3a thread class right-hand 0.480" thread length flat countersunk head style 18 thread quantity per inch navy special project cadmium surface treated unc thread series
2a thread class right-hand 1.037" thread length hexagon head style 24 thread quantity per inch navy special project passivate surface treated unf thread series