DIN 11851
DIN 11851 Fittings for food, chemical and pharmaceutical industry - Stainless steel screwed pipe connections - Design for rolling in and welding-on
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1998
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1998