2b thread class right-hand 20 thread quantity per inch flange face rounded by 6.050 in. spherical radius, max surface finish, od 80 microinches, all other surfaces 125 microinches cadmium surface treated
3b thread class right-hand 16 thread quantity per inch ht.tr or martemper to 180, 000-200, 000 p.s.i. per mac p.s. 15126 or mac p.s. 15411 cadmium surface treated