3a thread class right-hand 0.388" thread length flat countersunk head style 0.510" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.397" thread length double hexagon head style 1.177" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.467" thread length double hexagon head style 1.240" grip length 24 thread quantity per inch passivate surface treated unjf thread series
Used on b-2 bomber. 3a thread class right-hand flush countersunk head style 0.375" grip length 5380 double pounds per square inch shear strength unjf thread series
3a thread class right-hand 1.562" thread length flat fillister head style 28 thread quantity per inch navy special project passivate screw surface treated unjf thread series
3a thread class right-hand 1.125" thread length flat fillister head style 32 thread quantity per inch passivate screw surface treated unjc thread series