2a thread class right-hand 0.495" thread length hexagon extended washer head style 20 thread quantity per inch cadmium surface treated unc thread series
2a thread class right-hand 0.615" thread length pan no. 2 head style 13 thread quantity per inch navy special project passivate screw surface treated unc thread series
3a thread class right-hand 1.500" thread length flat chamfer head style 20 thread quantity per inch navy special project zinc surface treated unc thread series
3a thread class right-hand 2.625" thread length flat chamfer head style 16 thread quantity per inch navy special project zinc surface treated unc thread series
3a thread class right-hand 0.484" thread length flat chamfer head style 24 thread quantity per inch surface x casehardended to RC55 min RC60 max phosphate surface treated unf thread series