凸缘埋头垫圈和支撑垫圈的整体高度比后备垫圈高，所以埋头部分要深些。
Flange cup Washers generally have a greater overall height than Back up Washers and therefore the cup portion is deeper.
凸缘埋头垫圈和支撑垫圈的整体高度比后备垫圈高，所以埋头部分要深些。
Flange cup Washers generally have a greater overall height than Back up Washers and therefore the cup portion is deeper.
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