3a thread class right-hand 0.437" thread length flat chamfer head style 32 thread quantity per inch head vertically knurled anodize head surface treated unc thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.438" grip length 1490 single pounds per square inch shear strength
2a thread class right-hand 1.250" thread length hexagon head style 13 thread quantity per inch bolt, internally relieved body counterbore threaded unc thread series
3a thread class right-hand 1.376" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.641" thread length hexagon head style 0.065" hole diameter 0.079" grip length 28 thread quantity per inch unjf thread series