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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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