ISO 20515:2007规定了用于单列角接触球轴承、四点接触球轴承和径向圆柱滚子轴承外圈的固定槽的尺寸和公差。固定槽不适用于密封和屏蔽径向滚珠轴承的外圈，也不适用于无肋径向圆柱滚子轴承的外圈。

ISO 20515:2007 specifies dimensions and tolerances of retaining slots to be used for outer rings of single-row angular contact ball bearings, four-point-contact ball bearings and radial cylindrical roller bearings. The retaining slots are not suitable for use in the outer rings of sealed and shielded radial ball bearings, nor in the outer rings of radial cylindrical roller bearings without ribs.