ISO 383:1976

The requirements deal with four series of conial ground joints. The conicity, the great diameter and the length of the ground joint including the tolerances are specified and tabled. In addition the surface finish and the peak-to-valley height are specified. In annex A a system of gauging for the diameters and lengths of these joints are given, in annex B a method of testing the leakage including the apparatus is describes.