The accuracy of rolling bearings has dimensional accuracy and rotation accuracy. Its tolerances are specified by ISO 492 and JIS B 1514 (Tolerances of Rolling Bearings and Bearings), and the tolerances of precision rolling 3-1 radial bearings are applicable to grades 5, 4, and 2 for dynamic bearings. Tolerances of radial bearings are shown in Table 3.1 and 3.2 (P.8) Bearing Life Accuracy of Bearings ● Table 3.1 Tolerances of Inner Ring (JIS 5·4·2) Unit: μm bearing nominal bore diameter d (mm) Single plane average inner diameter deviation (1)u0026#1048615;dmp inner diameter deviation(1)u0026#1048615;ds Single inner diameter variation in a single plane (1)Vdsp Average inner diameter variation in a single plane (1)Vdmp exceeds the following. Class 5 Class 4 Class 2 Class 4 Class 2 Class 5 Class 4 Class 5 Class 4 Class 2 Upper Limit Lower Limit Lower Limit Lower Limit Lower Limit Lower Limit Maximum maximum. 2.5 10 0 -5 0 -4 0 -2.5 0 -4 0 -2.5 5 4 4 3 3 2 1.510 18 0 -5 0 -4 0 -2.5 0 -4 0 -2.5 5 4 4 3 3 2 1.518 30 0- 6 0 -5 0 -2.5 0 -5 0 -2.5 6 5 5 4 3 2.5 1.530 5 0 0 -8 0 -6 0 -2.5 0 -6 0 -2.5 8 6 6 5 4 3 1.550 80 0 -9 0 -7 0 -4 0 -7 0 -4 9 7 7 5 5 3.5 280 120 0 -10 0 -8 0 -5 0 -8 0 -5 10 8 8 6 5 4 2.5 120 150 0 -13 0 -10 0 -7 0 -10 0 -7 13 10 10 8 7 5 3.5150 180 0 -13 0 -10 0 -7 0 -10 0 -7 13 10 10 8 7 5 3.5180 250 0 -15 0 -12 0 -8 0 -12 0- 8 15 12 12 9 8 6 4 Unit: μm Bearing nominal inner diameter d (mm) Radial runout of the inner ring Kia The inclination of the inner ring end surface of the bearing relative to the bearing inner diameter axis Sd The runout of the inner ring end facing the raceway (2) Sia inner ring width deviation u0026#1048615; Bs inner ring width variation VBs exceeds the following 5 level 4 level 2 level 5 level 4 level 2 level 5 level 4 level 2 level 5 level 4/2 level 5/4 level/2 Level 5 level 4 level 2 maximum maximum maximum maximum maximum maximum maximum maximum maximum single bearing assembly bearing (3) maximum maximum maximum upper limit lower limit upper limit lower limit lower limit upper limit lower limit. 2.5 10 4 2.5 1.5 7 3 1.5 7 3 1.5 0 -40 0 -40 0 -250 5 2.5 1.510 18 4 2.5 1.5 7 3 1.5 7 3 1.5 0 -80 0 -80 0 -250 5 2.5 1.518 30 4 3 2.5 8 4 1.5 8 4 2.5 0 -120 0 -120 0 -250 5 2.5 1.530 50 5 4 2.5 8 4 1.5 8 4 2.5 0 -120 0 -120 0 -250 5 3 1.550 80 5 4 2.5 8 5 1.5 8 5 2.5 0 -150 0 -150 0 -250 6 4 1.580 120 6 5 2.5 9 5 2.5 9 5 2.5 0 -200 0 -200 0 -380 7 4 2.5120 150 8 6 2.5 10 6 2.5 10 7 2.5 0 -250 0 -250 0 -380 8 5 2.5 150 180 8 6 5 10 6 4 10 7 5 0 -250 0 -250 0 -380 8 5 4180 250 10 8 5 11 7 5 13 8 5 0 -300 0 -300 0 -500 10 6 5Note 1) Applicable to cylindrical bore bearings Note 2) Applicable to ball bearings Note 3) Applicable to each raceway ring made as a set bearing Note: The tolerance on the bearing inner diameter of the cylindrical bore bearing set in Table 3.1 is not applicable Within 1.2 times of the chamfer size (maximum) from the side of the raceway ring.