國標管（guǎn）件和美標管件最大的區別是什麽
國標管件和美（měi）標管件最（zuì）大的區別（bié）是：口徑。
美標都是國（guó）內（nèi）常說的A係列國標是B係列，比方說彎頭:DN100*6,公稱同徑都是DN100,國標DN100的外徑是108MM,厚度（dù）是6MM,美標DN100指（zhǐ）的英寸是4’,外徑是114.3MM,厚度同樣都是6MM,而且美標的彎頭（tóu）長度要比國標的略長一些。
也是說（shuō）相（xiàng）同（tóng）公（gōng）稱通徑的管件(包括彎頭、三通、大小（xiǎo）頭、管帽),國標（biāo）管件和美標管（guǎn）件的口徑（jìng）尺寸不一樣
公稱尺寸（cùn）inch | inch | 公稱通徑DN | 國標A | 國（guó）標B | 美標 | 日（rì）標 |
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 |
