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sh3405とhg20553の外径がなぜまだ一致しないのでしょうか

2017-10-12View Original

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今日、これら2つの規格を見直してみたところ、外径に差があることに気づきました。なぜでしょうか?達人のご指導をお願いします
Reply #22017-10-17
hg20553にはIa、Ib、IIの3つのシリーズがあり、Iaとsh/t3405のみが対応している
Reply #32019-07-26
すべてのDN65とDN125の2つの規格が異なるわけではなく、非常用の管径に分類されるもののです
Reply #42020-12-08
なぜ公称通径が異なる外径を二つ持つのか、今でも理解できない

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