flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 90000 single pounds per square inch shear strength passivate surface treated
2a thread class right-hand 3.375" thread length hexagon head style 0.125" grip length 13 thread quantity per inch zinc surface treated unc thread series
2a thread class right-hand 1.750" thread length fillister head style 0.046" hole diameter 32 thread quantity per inch anodize screw surface treated unf thread series
2a thread class right-hand 1.750" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unf thread series
3a thread class right-hand 0.641" thread length hexagon head style 4.312" grip length 24 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 1.250" thread length 20 thread quantity per inch paint, black spec jan-p-450, type 2 phosphate surface treated square bend unc thread series