1.【机】蝶形螺母
1.a nut that has a flat piece on each side to make it easier to hold
1.When the box was closed, it was secured by wing nuts on each side, and handles of sash cord were attached on the same sides.
容器关闭时,二边的蝶形螺母的把手固定在同一侧。
2.Hexagon nuts Wing nuts Lifting nuts
六角螺母蝶形螺母环形螺母