3a thread class right-hand 0.438" thread length flat countersunk head style 1.562" grip length 24 thread quantity per inch passivate surface treated unjf thread series
Used on f-16acft. 2a thread class right-hand 0.270" thread length flat countersunk head style 32 thread quantity per inch captive screw black oxide per mil-p-13924 class 4 passivate surface treated unc thread series