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Table 6 Tolerances of outside diameters for LRT and LRTZ (When the clearance is CN clearance)dBore diameter of inner ring mm3< F ≦ 66< F ≦ 1010< F ≦ 1818< F ≦ 3030< F ≦5050< F ≦ 80FOutside diameter of inner ringmmHighLowHighLow+50-5- 4- 9-190-10-10-11-21-26Low-12-12LowHigh00-18High-7Low-23High-4OverIncl.HighLow-10-27243040506580100120140160180200225250280315355400450500-243040506580100120140160180200225250280315355400450H3IRTLRT,LRTZIRBLRBLRBZ … BJIS Class 0(See the table 12, page A31)Based on Table 3Based on Table 4Remark Tolerances of outside diameter of inner ring arebased on Table 5.Table 3 Tolerances of IRBunit: μmdNominal inside diameter of inner ringmm∆dmp∆BsKiaSingle planeDeviation of a Radial runout of mean boresingle inner ring assembled diameter deviationwidthbearing inner ringIncl.HighLowHighLowMax.1010131520-250-250-250-250-25000000-13-13-13-13-13000001018305080Over 2.510183050dNominal inside diameter of inner ringmm∆dmp∆BsKiaSingle planeDeviation of a Radial runout of mean boresingle inner ring assembled diameter deviationwidthbearing inner ringIncl.HighLowHighLowMax.1013152025-130-130-130-130-13000000-10-13-13-15-2000000 19.050 30.162 50.800 82.550120.650Over-19.05030.16250.80082.550Table 4 Tolerances of LRB,LRBZ…Bunit: μmTable 2 Tolerances for inner ringModel codeTolerance■Identification numberThe identication number of Inner Rings consists of a model code and dimensions. An example is shown below. Example of identication numberModel codeDimensionsLRT202420Type of inner ringBore diameter of inner ring(20mm)Outside diameter of inner ring(24mm)Inner ring width(20mm)■AccuracyDimensional accuracy of Inner Rings is based on Table 2. Inner Rings for Shell Type Needle Roller Bearings are manufactured so that exact radial internal clearances can be obtained when assembled with Shell Type Needle Roller Bearings. Inner Rings for General Usage produce CN clearance when used in the assembled bearings shown in Table 1.2. LRB and LRBZ … B models produce the radial internal clear-ances shown in Table 4 on page D5. When clearances other than CN clearance or accura-cy other than Class 0 are required, please consult IKO.
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