DN鋼管外徑對照表（DN15-DN1400）DN鋼管外徑對照表（DN15-DN1400）公稱直徑

(DN)大外徑系列

(mm)小外徑系列

(mm)近似英寸尺寸標準依據

（大外徑）標準依據（小外徑）DN1521.3181/2"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN2026.9253/4"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN2533.7321"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN3242.4381?"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN4048.3451?"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN5060.3572"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN6576.1732?"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN8089893"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN1001141084"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN1251401335"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN1501681596"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN2002192198"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN25027327310"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN300323.932512"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN350355.637714"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN400406.442616"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN50050853020"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN60061063024"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN70071172028"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN80081382032"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN90091492036"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN10001016102040"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN11001118112044"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN12001220122048"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN13001320132052"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN14001420142056"ISO6708,GB/T17395JISG3454,DIN2448（舊）DN與英寸的對應：1英寸≈25.4mm，但DN與英寸非精確換算（如DN25≈1"，實際外徑33.7mm）。外徑與標準的關系：同一DN值在不同標準中外徑可能不