Stainless steel tube outer diameter A, B series comparison table
 
Series A is the international general series (commonly known as British tube).
 
B series is a series used in China (commonly known as metric tube) (mm)
 
Nominal diameter of steel tube nominal diameter of steel tube
 
Series A (imperial) series B (metric)
 
17.2 DN10 DN10 Φ Φ 14
 
DN 15 Φ 21.3 DN 15 Φ 18
 
DN 20 Φ 26.9 DN Φ 20
 
DN 25 Φ 33.7 DN 25 Φ 32
 
DN 32 Φ 42.4 DN Φ 38
 
DN 40 Φ 48.3 DN 40 Φ 45
 
DN 50 Φ 60.3 DN 50 Φ 57
 
DN 65 Φ DN 65 Φ 76.1 76
 
DN 80 Φ DN 80 Φ 88.9 89
 
DN 100 Φ DN 100 Φ 114.3 108
 
DN 125 Φ DN 125 Φ 139.7 133
 
DN 150 Φ DN 150 Φ 168.3 159
 
DN 200 Φ DN 200 Φ 219.1 219
 
DN Φ Φ DN 250 273 273 250
 
DN 300 Φ DN 300 Φ 323.9 325
 
DN 350 Φ DN 350 Φ 355.6 377
 
DN 400 Φ DN 400 Φ 406.4 426
 
DN Φ Φ DN 450 480 457 450
 
DN Φ Φ DN 500 530 508 500
 
DN Φ Φ DN 600 630 610 600
 
DN Φ Φ DN 700 720 711 700
 
DN Φ Φ DN 800 820 813 800
 
DN Φ Φ DN 900 920 914 900
 
DN Φ Φ DN 1000 1020 1016 1000
 
DN Φ Φ DN 1200 1220 1219 1200
 
DN Φ Φ DN 1400 1420 1422 1400
 
DN Φ Φ DN 1600 1620 1626 1600
 
DN Φ Φ DN 1800 1820 1829 1800
 
DN Φ Φ DN 2000 2020 2032 2000
 
 
 

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