Germany RBT import external thread needle valve can be equipped with stainless steel welded pipe, and pipeline butt welding connection, but also through the outer nut removing the valve.

品牌：进口外螺纹针型阀可配带不锈钢焊接管，能与管道直接对焊连接，也可通过外螺母拆卸阀门。

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Through the failure analysis of connecting bolt of down rod, it points out that it is not correct to put the thinner nut outer side if the double nut anti-loose method is adopted.

通过对游梁式抽油机对接式连杆下接头连接螺栓的失效分析，指出了采用双螺母防松时，将薄型螺母放置在外侧是不恰当的。

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Outer hexagon bolt in the bolt where the most frequently used type of one of its own external thread of the main function is to tie in with the nut.

外六角螺栓是在螺栓种类里使用最频繁的一种，它所拥有的外螺纹的主要功能是与螺母配合。

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