Used on aircraft model ah-1w. 3a thread class right-hand 0.252" thread length hexagon head style 1.093" grip length 16 thread quantity per inch navy special project 160, 000-180, 000 psi ultimate tensile strength per mil-h-6875 rockwell hardness: C36-C40; shank is cross-drilled cadmium surface treated unjf thread series
3a thread class right-hand 0.672" thread length square head style 0.198" hole diameter 20 thread quantity per inch item has 2 shank holes, undercut .093 inch between first shoulder cadmium surface treated unf thread series
3a thread class right-hand 0.874" thread length hexagon extended washer head style 0.046" hole diameter 20 thread quantity per inch counterbore unthreaded unf thread series