Tubes Do. Conditional dimensions. Translation of inches to millimeters.
DN (nominal, nominal diameter, or pass) is the parameter characterizing the compatibility of pipes and fittings for them. For example, any pipe DN 25 shall be compatible with the area, or coupling the same conditional pass. The nominal inside diameter approximately equal to the inner diameter in millimeters, it usually is given without specifying any units. That is, the name «pipe DN40» is correct, but «DN 50 mm» no.
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