3a thread class right-hand 0.340" thread length hexagon head style 0.046" hole diameter 32 thread quantity per inch passivate surface treated unjf thread series
2a thread class right-hand 0.500" thread length flat chamfer head style 16 thread quantity per inch straight knurl passivate surface treated unc thread series
2a thread class right-hand 0.500" thread length flat chamfer head style 20 thread quantity per inch straight knurl passivate surface treated unc thread series
2a thread class right-hand 0.375" thread length double chamfer head style 20 thread quantity per inch straight knurl nickel surface treated unc thread series
Used on aircraft model p-3. 3a thread class right-hand 0.190" thread length hexagon head style 28 thread quantity per inch lock-wire holes unf thread series
2a thread class right-hand 0.750" thread length knurled no. 4 head style 20 thread quantity per inch navy special project passivate surface treated unc thread series