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各国口径尺寸换算
| 公称尺寸inch | inch | 公称通径DN | 国标A | 国标B | 美标 | 日标 |
| 1/8" | 6 | 10.3 | ||||
| 1/4" | 8 | 13.7 | ||||
| 3/8" | 10 | 17.1 | ||||
| 1/2" | 0.840 | 15 | 21.3 | 18 | 21.3 | |
| 3/4" | 1.050 | 20 | 26.9 | 25 | 26.7 | 27.2 |
| 1" | 1.315 | 25 | 33.7 | 32 | 33.4 | 34 |
| 11/4" | 1.660 | 32 | 42.4 | 38 | 42.2 | 42.7 |
| 11/2" | 1.900 | 40 | 48.3 | 45 | 48.3 | 48.6 |
| 2" | 2.375 | 50 | 60.3 | 57 | 60.3 | 60.5 |
| 21/2" | 2.875 | 65 | 76.1 | 76 | 73.0 | 76.3 |
| 3" | 3.500 | 80 | 88.9 | 89 | 88.9 | 89.1 |
| 31/2" | 90 | 101.6 | 101.6 | |||
| 4" | 4.500 | 100 | 114.3 | 108 | 114.3 | 114.3 |
| 5" | 5.563 | 125 | 139.0 | 133 | 141.3 | 139.80 |
| 6" | 6.625 | 150 | 168.3 | 159 | 168.3 | 165.20 |
| 8" | 8.625 | 200 | 219.1 | 219 | 219.1 | 216.30 |
| 10" | 10.750 | 250 | 273.0 | 273 | 273.1 | 267.40 |
| 12" | 12.750 | 300 | 323.9 | 325 | 323.9 | 318.50 |
| 14" | 14.000 | 350 | 355.6 | 377 | 355.6 | 355.60 |
| 16" | 16.000 | 400 | 406.4 | 426 | 406.4 | 406.40 |
| 18" | 18.000 | 450 | 457.0 | 478 | 457.2 | 457.20 |
| 20" | 20.000 | 500 | 508.0 | 529 | 508.0 | 508.00 |
| 22" | 22.000 | 550 | 559.0 | 558.8 | 558.00 | |
| 24" | 24.000 | 600 | 610.0 | 630 | 609.6 | 609.60 |
| 26" | 26.000 | 650 | 660.0 | 660.4 | 660.40 | |
| 28" | 28.000 | 700 | 711.0 | 720 | 711.2 | 711.20 |
| 30" | 30.000 | 750 | 762.0 | 762.0 | 762.00 | |
| 32" | 32.000 | 800 | 813.0 | 820 | 812.8 | 812.80 |
| 34" | 34.000 | 850 | 864.0 | 863.6 | 863.60 | |
| 36" | 36.000 | 900 | 914.0 | 920 | 914.4 | 914.40 |
| 38" | 38.000 | 950 | 965.0 | 965.2 | 965.20 | |
| 40" | 40.000 | 1000 | 1016.0 | 1020 | 1016.0 | 1016.00 |
| 42" | 42.000 | 1050 | 1067.0 | 1066.8 | 1066.80 | |
| 44" | 44.000 | 1100 | 1118.0 | 1120 | 1117.6 | 1117.60 |
| 46" | 46.000 | 1150 | 1168.0 | 1168.4 | 1168.40 | |
| 48" | 48.000 | 1200 | 1219.0 | 1220 | 1219.2 | 1219.20 |
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