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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 thread, the design profile of the unr thread … 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的缩写,是统一螺纹细牙系列。unc是英文unified … 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至0. 14434p)的用unr表示。粗牙的是unc,细 …