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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
inmmType KType LType M
inmminmminmm
​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
1​1⁄4 1 3⁄8 34.925 1.245 31.623 1.265 32.131 1.291 32.791
1​1⁄2 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
2​1⁄2 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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