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いくつかの記号の表記について、教えていただけますか

2018-09-19View Original

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承継溶接用三通継手 PN6.3MPa Do=19mm PN16 MPa Do=19mm PN6.3MPa Do=19mm DO=19MM、これは外径が19なのでしょうか? 溶接式ストレートターミナル継手 PN6.3MPa 1/2NPT(M)-∅18 PN6.3MPa 1/2NPT(M)-∅18 18、これは内径ですか?

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