2a thread class right-hand 0.203" thread length flat countersunk head style 28 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.350" thread length flat countersunk head style 1.302" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 1.010" thread length flat countersunk head style 40 thread quantity per inch cadmium screw surface treated unc thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.657" grip length 10350 double pounds per square inch shear strength passivate bolt surface treated