A flat disk, as of metal, plastic, rubber, or leather, placed beneath a nut or at an axle bearing or a joint to relieve friction, prevent leakage, or distribute pressure.

• 垫圈:用金属、塑料、橡胶或皮革等制的平的圆盘状物,放于螺钉下或轮轴处或连接处以减少摩擦,防止渗漏或均衡压力。