Used on mc-130e. 3a thread class right-hand 0.782" thread length hexagon head style 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 1.250" thread length hexagon head style 13 thread quantity per inch navy special project zinc surface treated unc thread series
Used on aircraft, eagle f-15. 3a thread class right-hand 0.563" thread length double hexagon w/hole head style 0.060" hole diameter 32 thread quantity per inch unjf thread series