3a nut thread thread class right-hand nut thread 0.203" stud thread thread length 1.156" overall length 40 nut thread thread quantity per inch undercut to root dia 0.047 in. lg betweeen shoulder tin surface treated shouldered unc nut thread thread series
3a thread class right-hand 0.443" thread length flat countersunk undercut head style 28 thread quantity per inch furnished with one rubber o ring cadmium surface treated unf thread series
2a thread class right-hand 0.095" thread length watertight head style 32 thread quantity per inch navy special project passivate screw surface treated unf thread series