flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 450 double pounds per square inch shear strength anodize surface treated
3a thread class right-hand 0.400" thread length dished hexagon head style 0.046" hole diameter 28 thread quantity per inch passivate surface treated unjf thread series
2a thread class right-hand 1.750" thread length dished hexagon head style 2.312" grip length 10 thread quantity per inch passivate surface treated unc thread series