An approximate quadratic curve has been found to suit the relationship between the tolerances of roundness and their logarithmic fatigue lives with given survivability. 在相同存活率下，孔的圆度公差与孔的对数疲劳寿命呈二次曲线关系。
Radial run-out tolerance and axiality tolerance that often used in tolerance of form and position are positioning tolerance. 径向跳动公差与同轴度公差是形位公差项目中常用的位置公差。
