3a thread class right-hand 0.922" thread length hexagon head style 1.546" grip length 18 thread quantity per inch passivate surface treated unf thread series
2a thread class right-hand 1.376" thread length pan head style 32 thread quantity per inch passivate screw surface treated distance from underside of head to beginning of undercut 0.437 in., undercut thread to minor dia, 0.688 in lg unc thread series
2a thread class right-hand 0.068" thread length flat countersunk undercut head style 80 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.370" thread length flat chamfer head style 0.044" hole diameter 20 thread quantity per inch cadmium surface treated unrc thread series