2a thread class right-hand 0.535" thread length flat chamfer head style 16 thread quantity per inch threads undercut for relief: 0.310 in. dia. x 0.065 in. wide unc thread series
3a thread class right-hand 0.750" thread length flat chamfer head style 13 thread quantity per inch head may be knurled passivate surface treated unc thread series
2a thread class right-hand 0.375" thread length flat chamfer head style 24 thread quantity per inch heat treated oxide surface treated unc thread series