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" | 0.84 | 15 | 21.3 | 18 | 21.3 |
|
| 3/4" | 1.05 | 20 | 26.9 | 25 | 26.7 | 27.2 |
| 1" | 1.315 | 25 | 33.7 | 32 | 33.4 | 34 |
| 11/4" | 1.66 | 32 | 42.4 | 38 | 42.2 | 42.7 |
| 11/2" | 1.9 | 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 | 76.3 |
| 3" | 3.5 | 80 | 88.9 | 89 | 88.9 | 89.1 |
| 31/2" |
|
90 |
|
|
101.6 | 101.6 |
| 4" | 4.5 | 100 | 114.3 | 108 | 114.3 | 114.3 |
| 5" | 5.563 | 125 | 139 | 133 | 141.3 | 139.8 |
| 6" | 6.625 | 150 | 168.3 | 159 | 168.3 | 165.2 |
| 8" | 8.625 | 200 | 219.1 | 219 | 219.1 | 216.3 |
| 10" | 10.75 | 250 | 273 | 273 | 273.1 | 267.4 |
| 12" | 12.75 | 300 | 323.9 | 325 | 323.9 | 318.5 |
| 14" | 14 | 350 | 355.6 | 377 | 355.6 | 355.6 |
| 16" | 16 | 400 | 406.4 | 426 | 406.4 | 406.4 |
| 18" | 18 | 450 | 457 | 478 | 457.2 | 457.2 |
| 20" | 20 | 500 | 508 | 529 | 508 | 508 |
| 22" | 22 | 550 | 559 |
|
558.8 | 558 |
| 24" | 24 | 600 | 610 | 630 | 609.6 | 609.6 |
| 26" | 26 | 650 | 660 |
|
660.4 | 660.4 |
| 28" | 28 | 700 | 711 | 720 | 711.2 | 711.2 |
| 30" | 30 | 750 | 762 |
|
762 | 762 |
| 32" | 32 | 800 | 813 | 820 | 812.8 | 812.8 |
| 34" | 34 | 850 | 864 |
|
863.6 | 863.6 |
| 36" | 36 | 900 | 914 | 920 | 914.4 | 914.4 |
| 38" | 38 | 950 | 965 |
|
965.2 | 965.2 |
| 40" | 40 | 1000 | 1016 | 1020 | 1016 | 1016 |
| 42" | 42 | 1050 | 1067 |
|
1066.8 | 1066.8 |
| 44" | 44 | 1100 | 1118 | 1120 | 1117.6 | 1117.6 |
| 46" | 46 | 1150 | 1168 |
|
1168.4 | 1168.4 |
| 48" | 48 | 1200 | 1219 | 1220 | 1219.2 | 1219.2 |
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