Hexagon Head & Socket Screw 内六角及外六角螺栓 ; 外六角螺钉

hexagon socket head screw 六角凹头螺钉

hexagon socket head cap screw 内六角螺丝 ; 内六角圆柱头螺钉

hexagon socket head cahead screw 内六角圆柱头螺钉

hexagon socket cap head screw 内六角圆柱头螺钉

hexagon socket countersunk head screw 内六角沉头螺钉

hexagon socket head shoulder screw 内六角圆柱头轴肩螺钉