Определение nominal diameter в Английский Язык Английский Язык словарь
An approximate measurement of the diameter of a pipe Although the nominal diameter is used to describe the size or diameter of a pipe, it is usually not the exact inside diameter of the pipe
(abrv: Nom Dia) Dimension that comes from the original diameter of stock tubing before it is machined Machined buting is always slightly less than the Nominal Diameter listed