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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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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