Threading : Various types and sizes of Threading like B.S.W., B.S.F., B.S.B., B.S.P. & B.S.P.T as per British Standard Whitworth Form and N.C. & U.N.C., N.F. & U.N.F., N.P.T & N.P.S., N.S., N.E.F. etc as per American National Form Threads are available. All threads shall be as per International GO & NO-Go Standards.