3a thread class right-hand 0.401" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated conical surface of head 32 unjf thread series
Used on aircraft,eagle f-15. 3a thread class right-hand 0.371" thread length double hexagon head style 0.802" grip length 28 thread quantity per inch unjf thread series
3a thread class right-hand 0.413" thread length dished hexagon head style 0.428" grip length 24 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.359" thread length round extended washer head style 32 thread quantity per inch navy special project cadmium or zinc surface treated unf thread series
3a thread class right-hand 0.350" thread length flat countersunk head style 0.990" grip length 24 thread quantity per inch passivate surface treated unjf thread series