In order to prevent the inverse loosing after the operation, the spring washer (5) is added between the nut and the washer.
为了防止术后反松，在螺帽与垫圈间又增加了一弹簧垫圈(5)。
In order to prevent the inverse loosing after the operation, the spring washer (5) is added between the nut and the washer.
为了防止术后反松，在螺帽与垫圈间又增加了一弹簧垫圈(5)。
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