2a thread class right-hand 0.144" thread length flat countersunk head style 44 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.400" thread length dished hexagon head style 0.046" hole diameter 28 thread quantity per inch cadmium surface treated unf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.225" grip length 49000 single pounds per square inch shear strength cadmium surface treated
3a thread class right-hand 0.366" thread length dished hexagon head style 0.178" grip length 24 thread quantity per inch cadmium surface treated unjf thread series