• Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.

    在内螺纹顶端或者螺纹的端部拥有相同的中而且拥有相同的螺纹长度深度

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  • The external diameter of the middle part of each guiding expansion head is larger than that of the through pipe.

    导向扩张中部直径大于管的外直径。

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  • The external diameter of the middle part of each guiding expansion head is larger than that of the through pipe.

    导向扩张中部直径大于管的外直径。

    youdao

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