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There are many types of copper tube, Belowing is a table about differenct copper tube's dimensions and weights, the datas could be found in standards ASTM B88 & ASTM B306.
Copper tubes of these types has a actual outside diameters that 1/8" larger than the norminal sizes. For example, 1/4 inches type L tube's actual O.D. (outside diameters) is 3/8 inches.
This sounds strange, people commonly call the copper tube by norminal sizes, if you are design piping system, be careful to choose the right tubes.
Same szie type K, L, M and DWV copper tubes have different thickness, according to alphabetic order, type K copper tube is the thickest and type M copper tube is the thinnest. Type DWV copper tube is even thinner than type M.
Copper tubes of these types' actual outside diameters is equal to norminal outside diameters. For example, 1/2 inches Type ACR copper tube's actual outside diameters is 1/2 inches.