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These bearings are not interchangeable with bearings sharing the same basic part number. •Modified IsoClass Bearings. Timken has developed modified ISO 355. XGA30210. Y30210. 52.000. 90.000. 21.750. 20.000. 17.000. 4.0. 1.5. 0.52 kg. 2.0472. 3.5433. 0.8563. 0.7874. 0.6693. 0.16. 0.06. 1.15 lb. X30211. Y30211.