3a thread class right-hand 0.620" thread length flat countersunk head style 40 thread quantity per inch cadmium screw surface treated color gray fed std no. 36307 unc thread series
2a thread class right-hand 0.460" thread length hexagon head style 24 thread quantity per inch one flat of hex head cut to 0.250in. from center line to end unf thread series
3a thread class right-hand 3.188" thread length crowned hexagon head style 0.031" grip length 24 thread quantity per inch cadmium or chromate surface treated unf thread series
3a thread class right-hand 0.437" thread length hexagon head style 0.984" grip length 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.265" thread length knurled no. 1 head style 32 thread quantity per inch cone point 90 deg of angle passivate surface treated unf thread series
