The tubing sizes and thickness usually furnished to this specication are 14 in. (6.4 mm) in inside diameter and larger and 0.020 in. (0.51 mm) in nominal wall-thickness and heavier. Mechanical properties requirements do not apply to tubing smaller than 18 in. (3.2 mm) in inside diameter or 0.015 in. (0.38 mm) in thickness.
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Sizes of steel tubes and pipesThe PIPE sizes are given as the nominal tube size. For sizes up to 12 inches the approximate size (clearance) of the inside pipe diameter is given. From the PIPE dimensions after their conversion to millimeters, is created the first preferred line of the outer diameter of steel tube (1st line is in EN 10220, DIN 2448, etc.).
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