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1·The hexagonal nut is a common nut.

六角螺母为普通螺母。

2·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。