Introduction - Mettex（介绍Mettex）.pdf

STANDARDIZATION Introduction The commonly used commercial fasteners are mainly standardized. The standards offer extensive technical information to the supplier as well as to the user and make a vital link in the mutual commercial trade. This general introduction aims to give an overall picture to those not familiar with the rather complicated situation of the international and national standardization of fasteners and screw thread. = ISO = The ISO (International Organisation for Standardization) operates as a worldwide coordinating body. Its aim is to produce order or unity in the divergences of the national standards. The ISO is trying to create an absolute interchangeability of products all over the world by issuing ISO- standards. Within this organisation the Technical Commitees ISO/TC 1 “Screw Threads” and ISO/TC 2 “Fasteners” - in the latter 28 countries are active and 22 countries passive members - are responsible for these two specialized areas. In the mean time already more than 100 ISO-standards are published in the English and French language and it may be expected that in the near future this number will increase very rapidly as a consequence of the intensified activities of ISO TC2. In 1984 for the first time these standards have been collected in the ISO-Standards Handbook 18 “Fasteners and Screw Threads”, and in the French edition Recueil de Normes ISO 18 Elements de fixation et filetages. = DIN = The national German DIN (Deutsches Institut für Normung) and the international DIN-ISO standards are very popular, leading standards in Europe. In some countries like the Netherlands, Switzerland and Austria new national standards are no longer issued, the existing ones being gradu