Back to top

Standard size for copper pipe

 

Nominal Pipe Size inches O.D. I.D. Wall Thickness
Type
K* L** M*** DWV**** K L M DWV
1/4 0.375 0.305 0.315 - - 0.035 0.030 - -
3/8 0.500 0.402 0.430 0.450 - 0.049 0.035 0.025 -
1/2 0.625 0.527 0.545 0.569 - 0.049 0.040 0.028 -
5/8 0.750 0.652 0.666 - - 0.049 0.042 - -
3/4 0.875 0.745 0.785 0.811 - 0.065 0.045 0.032 -
1 1.125 0.995 1.025 1.055 - 0.065 0.050 0.035 -
1-1/4 1.375 1.245 1.265 1.291 1.295 0.065 0.055 0.042 0.040
1-1/2 1.625 1.481 1.505 1.527 1.541 0.072 0.060 0.049 0.042
2 2.125 1.959 1.985 2.009 2.041 0.083 0.070 0.058 0.042
2-1/2 2.625 2.435 2.465 2.495 - 0.095 0.080 0.065 -
3 3.125 2.907 2.945 2.981 3.030 0.109 0.090 0.072 0.045
3.5 3.625 3.385 3.425 3.459 - .120 .100 .083 -
4 4.125 3.857 3.897 3.935 4.009 .134 .114 .095 .058
5 5.125 4.805 4.875 4.907 4.981 .160 .125 .109 .072
6 6.125 5.741 5.845 5.881 5.959 .192 .140 .122 .083
8 8.125 7.583 7.725 7.785 - .271 .200 .170 -

*K, thick walled, underground residential, commercial and industrial uses.

**L, medium walled, residential and commercial uses

***M, thin walled, above ground residential and light commercial uses.

****DWV, Drain/Waste/Vent, non-pressurized