2a thread class right-hand 0.484" thread length oval countersunk head style 40 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.312" thread length undercut pan no. 2 head style 40 thread quantity per inch oxide screw surface treated w/packing, preformed unc thread series
3a thread class right-hand 0.812" thread length hexagon head style 0.360" grip length 20 thread quantity per inch passivate surface treated unjf thread series