等径、异径三通公称通径表 公称通径 nominal diameter 坡口处外径 outside diameter 中心至端面 center to end d1 d2 dn nps a系列 series a b系列 series b a系列 series a b系列 series b c m 15×15×15 1/2×1/2×1/2 21.3 18 21.3 18 25 25 15×15×10 1/2×1/2×3/8 21.3 18 17.3 14 25 25 15×15×8 1/2×1/2×1/4 21.3 18 13.7 10 25 25 20×20×20 3/4×3/4×3/4 26.9 25 26.9 25 29 29 20×20×15 3/4×3/4×1/2 26.9 25 21.3 18 29 29 20×20×10 3/4×3/4×3/8 26.9 25 17.3 14 29 29 25×25×25 1×1×1 33.7 32 33.7 32 38 38 25×25×20 1×1×3/4 33.7 32 26.9 25 38 38 25×25×15 1×1×1/2 33.7 32 21.3 18 38 38 32×32×32 1.1/4×1.1/4×1.1/4 42.4 38 42.4 38 48 48 32×32×25 1.1/4×1.1/4×1 42.4 38 33.7 32 48 48 32×32×20 1.1/4×1.1/4×3/4 42.4 38 26.9 25 48 48 32×32×15 1.1/4×1.1/4×1/2 42.4 38 21.3 18 48 48 40×40×40 1.1/2×1.1/2×1.1/2 48.3 45 48.3 45 57 57 40×40×32 1.1/2×1.1/2×1.1/4 48.3 45 42.4 38 57 57 40×40×25 1.1/2×1.1/2×1 48.3 45 33.7 32 57 57 40×40×20 1.1/2×1.1/2×3/4 48.3 45 26.9 25 57 57 40×40×15 1.1/2×1.1/2×1/2 48.3 45 21.3 18 57 57 50×50×50 2×2×2 60.3 57 60.3 57 64 64 50×50×40 2×2×1.1/2 60.3 57 48.3 45 64 60 50×50×32 2×2×1.1/4 60.3 57 42.4 38 64 57 50×50×25 2×2×1 60.3 57 33.7 32 64 51 50×50×20 2×2×3/4 60.3 57 26.9 25 64 44 注：上述尺寸符合gb/t12459、gb/t13401、asme b16.9、sh3408、sh3409、hg/t21635、hg/t21631、sy/t05010标准 above dimeio acc.to gb/t12459、gb/t13401、asme b16.9、sh3408、sh3409、hg/t21635、hg/t21631、sy/t05010