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高強度ボルトはどの規格で定義されていますか?

2017-07-19View Original

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皆様、ネット上では高強度ボルトや超高強度ボルトという呼び方があり、8.8級以上を高強度ボルトと呼んでいるようです; これには何か規定する文書がありますか?どの文書に、8.8級以上を高強度ボルトと呼ぶと記載されていますか? 知っています、教えてください、ありがとう。
Reply #22017-07-19
HG/T 20634-2009 表4.0.1

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