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DIN stands for: "Deutches Institut fur Normung".
Their main activity, similar in concept to UL or CSA, is the development of technical standards to apply to a host of commerce related goods and services manufactured in Germany, in Europe, and by manufacturer's in other countries around the world that choose to build their products to meet these standards.
Manufacturers of goods that meet the DIN standards, ensure that like products have standard specifications pertaining that that particular product.
As it pertains to compressed air components, if you purchase an item that meets the DIN standard, you can be assured that the same type of component with the same DIN number, purchased at a later date from another vendor, will have common features and specifications that are covered by the DIN standard.
Complete information on DIN standards and specifications (available at a cost) can be found at their web site here: www2.din.de
