ISO 12090-2:2011确定了直线运动滚动轴承、异型导轨系列4和系列5的外形尺寸和公差。 这些轴承由带托架的异型轨道组成，能够支撑来自所有垂直方向的力和围绕所有轴的力矩，并由循环滚动元件组成。这些异型导轨的内部设计由制造商自行决定。一个组件可以包括一个或多个位于线性轮廓轨道上的车厢。

ISO 12090-2:2011 establishes the boundary dimensions and tolerances for series 4 and 5 of linear motion rolling bearings, profiled rail guides. These bearings consist of profiled rails with carriages, which can support forces from all perpendicular directions and moments around all axes and consist of recirculating rolling elements. The internal design of these profiled rail guides is at the discretion of the manufacturer. An assembly can comprise one or more carriages on a linear profiled rail.