2a thread class right-hand 0.250" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unc thread series
2a thread class right-hand 0.375" thread length flat countersunk head style 56 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.251" thread length flat chamfer head style 0.490" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.511" thread length dished hexagon head style 5.500" grip length 18 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 0.562" thread length headless (setscrew) head style 56 thread quantity per inch navy special project passivate surface treated unf thread series
3a thread class right-hand 0.469" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.161 mils grip length 33000 single pounds per square inch shear strength anodize or oxide film surface treated