ISO 12240的本部分规定了径向球面滑动轴承的尺寸系列、公差和径向内部间隙。选择ISO 12240本部分中规定的尺寸和公差，以允许使用多种滑动材料组合设计径向球面滑动轴承。规定的公差值适用于任何涂层、电镀、环裂或环裂之前的成品径向球面滑动轴承。对于经表面处理的径向球面滑动轴承，可能与规定的公差值有轻微偏差。径向球面滑动轴承无需符合图示设计，但需要符合规定的尺寸、公差和径向内部间隙。 注:ISO 12240的本部分不包括用于机身应用的球面滑动轴承。

This part of ISO 12240 specifies dimension series, tolerances and radial internal clearances for radial spherical plain bearings. The dimensions and tolerances specified in this part of ISO 12240 have been selected to permit the design of radial spherical plain bearings using a wide choice of sliding material combinations. The specified tolerance values apply to finished, radial spherical plain bearings before any coating, plating, ring splitting or ring fracturing. In the case of surface treated radial spherical plain bearings, there may be slight deviations from the specified tolerance values. Radial spherical plain bearings need not conform to the designs illustrated but compliance is required as regards the dimensions, tolerances and radial internal clearances specified. NOTE - Spherical plain bearings for airframe applications are not covered by this part of ISO 12240.