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15问答网 > 工程图学的公称直径是指什么的?

工程图学的公称直径是指什么的?

2025-03-26 17:40:43

推荐回答（1个）

回答1：

就是图纸标注直径，没有包含公差的直径。
百度百科的解释是：公称直径(nominal
diameter)，又称平均外径(mean
outside
diameter)。
指标准化以后的标准直径，以DN表示，单位mm。本人以为不甚准确。例如
Φ20就不是平均直径，但却是公称直径。

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