The straightness and parallelism of a track surface on which rollers roll are measured within a range “L2” as a range for measuring the straightness and parallelism. The range “L2” is a range such that L2≧0.8×L when a roller length is “L”. When the dimension from the corner P of the flange on the inner diameter side to the starting point of the range “L2” is “L1”, the dimension “L1” is ranged such that 0.8 mm≦L1≦2 mm. In this range, the straightness of the track surface of the outer ring in the axial direction is not more than 0.008 mm and the parallelism thereof is not more than 0.015 mm.
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机译：在作为测量直线度和平行度的范围的“ L 2 ”范围内，测量滚子在其上滚动的轨道表面的直线度和平行度。范围“ L 2 ”是使得当辊长为“ L”时L 2 ≥0.8×L的范围。当从内径侧的凸缘的拐角P到范围“ L 2 ”的起点的尺寸为“ L 1 ”时，尺寸“ L 1 ”的范围使得0.8mm≤L 1 ≤2mm。在此范围内，外圈的轨道表面在轴向上的平直度不大于0.008mm，并且其平行度不大于0.015mm。
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