3a thread class right-hand flat countersunk head style 16 thread quantity per inch screw, cap, hex socket, flat countersunk head passivate surface treated unc thread series
3a thread class right-hand flat countersunk head style 32 thread quantity per inch screw, cap, hex socket, flat countersunk head passivate surface treated unf thread series
2a thread class right-hand 1.906" thread length hexagon head style 14 thread quantity per inch screw, heax head magnetic port inspection iaw mil-i-6868; next higher assembly: fixture, shiping zinc surface treated unf thread series
3a thread class right-hand flat countersunk head style 20 thread quantity per inch screw, cap, hex socket, flat countersunk head zinc surface treated unf thread series
3a thread class right-hand flat fillister head style 18 thread quantity per inch screw, cap, hex socket cylindrical head, 1960 series zinc surface treated unf thread series
3a thread class right-hand 0.629" thread length hexagon head style 20 thread quantity per inch navy special project cadmium surface treated unjf thread series