This standard ( Part II) covers the requirements for butt welded and seamless, plain ended, screwed and socketed mild steel tubulars and other welded and seamless wrought steel pipe fittings. The requirements of back nuts aie covered in IS : 3468-1975〓.
IS 1239 Pt.2-1982 history
1983IS 1239 Pt.2-1982 Specification for mild steel pipes, tubes and other forged steel fittings Part II Mild steel pipes and other forged steel fittings