公制 (外径 *壁厚) mm 国标(DN)mm 国标外径( mm) 备注 10S φ17.1×1.65 40S φ17.1×2.31 80S φ17.1×3.20 STD φ17.1×2.31 40 φ17.1×2.31 XS φ17.1×3.20 80 φ17.1×3.20 5S φ21.3×1.65 10S φ21.3×2.11 40S φ21.3×2.77 80S φ21.3×3.73 STD φ21.3×2.77 40 φ21.3×2.77 XS φ21.3×3.73 80 φ21.3×3.73 160 φ21.3×4.78 XXS φ21.3×7.47 5S φ26.7×1.65 10S φ26.7×2.11 40S φ26.7×2.87 80S φ26.7×3.91 STD φ26.7×2.87 40 φ26.7×2.87 XS φ26.7×3.91 80 φ26.7×3.91