Unr 2024 Holiday Dates: Everything You Need To Know

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Un,unf,unc;是英寸制统一螺纹的识别 un是英文unified national的缩写，属于统一螺纹的恒定螺距系列。unf是英文unified national fine的缩 … Un和unr有什么区，代表什么？un是英制统一螺纹，牙型角是60度，公称直径以英寸为单位。其中外螺纹牙底做成相应圆弧（半径为0. 12825p … Unr：外螺纹设计牙型根部必须为圆弧 (in order to reduce the rate of threading tool crest wear and to improve fatigue strength of a flat root …