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CTS - Copper Tube Sizes - Dimensions used in Plumbing

Copper tube sizes used in plumbing.

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Note that CTS - Copper Tube Sizes - are also used for other plumbing materials like CPVC tubes.

CTS - Copper Tubing Sizes used in Plumbing
Nominal size	Outside diameter OD		Inside diameter ID
	in	mm	Type K		Type L		Type M
	in	mm	in	mm	in	mm	in	mm
1⁄4	3⁄8	9.5	0.305	7.747	0.315	8.001
3⁄8	1⁄2	12.7	0.402	10.211	0.430	10.922	0.450	11.430
1⁄2	5⁄8	15.875	0.528	13.411	0.545	13.843	0.569	14.453
5⁄8	3⁄4	19.05	0.652	16.561	0.668	16.967	0.690	17.526
3⁄4	7⁄8	22.225	0.745	18.923	0.785	19.939	0.811	20.599
1	1 1⁄8	28.575	0.995	25.273	1.025	26.035	1.055	26.797
11⁄4	1 3⁄8	34.925	1.245	31.623	1.265	32.131	1.291	32.791
11⁄2	1 5⁄8	41.275	1.481	37.617	1.505	38.227	1.527	38.786
2	2 1⁄8	53.975	1.959	49.759	1.985	50.419	2.009	51.029
21⁄2	2 5⁄8	66.675	2.435	61.849	2.465	62.611	2.495	63.373
3	3 1⁄8	79.375	2.907	73.838	2.945	74.803	2.981	75.717

Wall-thicknesses used for plumbing in the U.S. and Canada are the CTS - Copper Tube Sizes - Type K, L and M.

In Europe the wall-thicknesses used are based on BS 2871 Copper Tubes Type X, Y and Z / EN 1057 Copper and copper alloys. Seamless, round copper tubes for water and gas in sanitary and heating applications.

Note that CPVC pipes in schedule 40 and 80 also are delivered in NPS sizes.

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