nominal wall thickness 中文意思是什麼
nominal wall thickness
解釋
標稱壁厚-
Tolerance on outer diameter and wall thickness should be observed, but for the following two circum stances, shorter axis should not be less than 95 % of nominal diameter
管材的不圓和壁厚不勻,應不超出外徑的壁厚允許偏差,但屬下列兩種情況之一者,其短軸尺寸應不小於公稱外徑的95 % 。
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