Used on b-2 bomber aircraft. 3a thread class right-hand 0.736" thread length flat countersunk head style 0.812" grip length 24 thread quantity per inch unjf thread series
3a thread class right-hand 0.397" thread length spline drive shear head head style 0.562" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.397" thread length spline drive shear head head style 0.375" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.397" thread length spline drive shear head head style 0.312" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.397" thread length spline drive shear head head style 0.437" grip length 28 thread quantity per inch passivate surface treated unjf thread series