Used on b-1b bomber. flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.470" grip length 7200 double pounds per square inch shear strength passivate bolt surface treated
3a thread class right-hand 0.735" thread length hexagon head style 1.688" grip length 20 thread quantity per inch cadmium surface treated unjf thread series