The connecting screw adopts a bone screw, and the head of the screw is outer-hexagonal, and the nut adopts an expanding hexagon nut or a hexagon nut.
所述连接螺钉采用骨螺钉，螺钉头为外六角。所述螺母采用膨胀六角螺母或六角螺母。
EN14399-4:2005 High-strength structural bolting assemblies for preloading-Part 4: System HV-Hexagon bolt and nut assemblies.
预载荷高强度结构螺栓连接副-第4部分：HV系统-连接副的螺栓和螺母。
But thinks carefully, the question has come, what can the nut certainly make the hexagon the reason is?
但是仔细想一想，问题就来了，螺母一定要做成六角形的原因是什么呢？
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。
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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