3a thread class right-hand 0.366" thread length hexagon head style 24 thread quantity per inch cadmium surface treated concentric hole unthreaded unjf thread series
2a thread class right-hand 0.525" thread length fillister head style 0.046" hole diameter 32 thread quantity per inch paint head surface treated unf thread series
Used on w/s: f4s aircraft. 3a thread class right-hand flush countersunk head style 0.740" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.122" thread length flat chamfer head style 0.036" hole diameter 40 thread quantity per inch oxide surface treated unjc thread series