Used on C5M. 3a thread class right-hand 0.413" thread length dished hexagon head style 0.046" hole diameter 3.438" grip length 24 thread quantity per inch bolt unjf thread series
2a thread class right-hand 0.750" thread length round head style 0.750" grip length 20 thread quantity per inch round head square neck bolt square neck unc thread series
3a thread class right-hand straight pan head style 1.057" grip length 24 thread quantity per inch 132000 single pounds per square inch shear strength nickel surface treated unjf thread series