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平ワッシャーの材料規格

2016-01-29View Original

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先ほどプロジェクトの材料等級表を受け取ったのですが、平垫圈の材料記述にはGRADE9と書かれており、寸法規格はASME B18.22.1、SAE「N」となっています。このGRADE9とは一体どの材料規格なのでしょうか? A194について調べたところ、Gr.9C(A)のみで、なぜかGr.9はありません。解決策をお願いします。よろしくお願いいたします!

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