国家螺纹管标准和美国标准直管螺纹（ NPS）是无法互换的 NPT threads may look similar to ISO 7/1 threads.
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American standard taper pipe thread NPT
... 直管螺纹 Straight pipe thread 美国标准直管螺纹 American standard taper pipe thread NPT 管子内螺纹 Internal pipe thread IPT ...
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