常见管螺纹的尺寸标准:通称尺寸对应口径尺寸代号外径壁厚最小壁厚1/161分DN61/82分DN81/43分DN103/84分DN151/221.32.82.456分DN203/426.92.82.451寸DN25133.73.22.81.2寸DN321.1/442.43.53.061.5寸DN401.1/248.33.53.062寸DN50260.33.83.3252.5寸DN652.1/276.143.53寸DN80388.943.5寸3.1/24寸DN1004114.345寸DN12551404.56寸DN1506168.34.58寸DN2008219.110寸DN250