flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.563" grip length 65000 single pounds per square inch shear strength
2a thread class right-hand 0.250" thread length flat countersunk head style 40 thread quantity per inch cadmium or chromium screw surface treated unc thread series
3a thread class right-hand 0.469" thread length hexagon head style 1.312" grip length 28 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.406" thread length hexagon head style 0.750" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 1.000" thread length hexagon head style 0.070" hole diameter 3.375" grip length 24 thread quantity per inch unf thread series
2a thread class right-hand 1.000" thread length hexagon head style 1.500" grip length 13 thread quantity per inch cadmium surface treated unc thread series