right-hand 0.656" thread length hexagon countersunk head style 18 thread quantity per inch countersink in top of head 1/2 in. dia by 1/16 in. deep cadmium or zinc surface treated unf thread series
3a thread class right-hand 0.902" thread length hexagon head style 18 thread quantity per inch chromium surface treated concentric hole threaded unjf thread series
2a thread class right-hand 1.188" thread length fillister head style 32 thread quantity per inch navy special project cadmium screw surface treated unf thread series
2a thread class right-hand 0.625" thread length headless (setscrew) head style 20 thread quantity per inch 1/4 in. radius on slotted end phosphate surface treated unc thread series
3a thread class right-hand 0.815" thread length dished hexagon head style 2.427" grip length 18 thread quantity per inch cadmium surface treated unf thread series
