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。