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圆度是在通过轴线上规定点并垂直于轴线的平面内零件的圆的形状误差。 对轴来说,以轴的外接圆直径与最小可测直径之差表示。 对孔来说,以孔的内接圆直径与最大可测直径之差表示。
Circularity is the shape error of a circle of a part in a plane that passes through a point on the axis and is perpendicular to the axis. For shafts, the difference between the diameter of the circumscribed circle of the shaft and the minimum measurable diameter. For holes, the difference between the diameter of the inscribed circle of the hole and the maximum measurable diameter.