因为球冠形封头(spherically dished head)不以内径或外径为基准,则以其英文译名的缩写SDH浮现。因为锥形封头的半顶角凡是分为30°、45°、60°三种,则在其代号后加上(30)...
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... spherically dished bottom head 半球形底封头 spherically dished head 球形封头 spherically faced closure washer 球面封头垫圈 ...
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spherically dished bottom head 半球形底封头
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