3a thread class right-hand 0.330" thread length dee head style 20 thread quantity per inch cadmium threads surface treated counterbore unthreaded unf thread series
2a thread class right-hand 0.188" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 1.740" grip length 26000 single pounds per square inch shear strength anodize or oxide film surface treated
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 1.440" grip length 26000 single pounds per square inch shear strength anodize or oxide film surface treated
3a thread class right-hand 0.275" thread length hexagon head style 20 thread quantity per inch design analysis; nuclear hardness critical unf thread series
3a thread class right-hand 0.279" thread length flat chamfer head style 0.050" hole diameter 24 thread quantity per inch passivate surface treated unjf thread series