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。