3a thread class right-hand 0.750" thread length hexagon head style 7.296" grip length 20 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.347" thread length flat countersunk head style 32 thread quantity per inch navy special project cadmium surface treated unc thread series
3a thread class right-hand 0.884" thread length flat chamfer head style 20 thread quantity per inch passivate fastener surface treated unc thread series