3a thread class right-hand flush countersunk head style 0.620" grip length 28 thread quantity per inch 108000 single pounds per square inch shear strength double shear strength 10600 lb unjf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.563" grip length 1090 single pounds per square inch shear strength anodize or chromate surface treated
3a thread class right-hand 0.320" thread length undercut hexagon head style 0.365" grip length 32 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.515" thread length flat countersunk head style 18 thread quantity per inch phosphate screw surface treated unf thread series
3a thread class right-hand 0.312" thread length hexagon head style 0.031" hole diameter 28 thread quantity per inch navy special project phosphate manganese surface treated unf thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.251" grip length anodize body or chromate body surface treated
