2a thread class right-hand 0.669" thread length thumb no. 7 head style 18 thread quantity per inch hole tapped in head longitudinal to axis 10-32-unf-2BX0.500deep unc thread series
3a thread class right-hand 0.689" thread length hexagon head style 0.275" grip length 24 thread quantity per inch passivate surface treated unf thread series
3a thread class right-hand 0.429" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unf thread series