BEARING DESIGNATION SYSTEMS - nsk-literature.com
R R Bearing outer ring with rollers and cage, no inner ring Example: R NU 207 For NU 207 cylindrical roller bearing: outer ring with roller crown and cage Instead of the prefix R, the following designation can also be used at NSK: (example) RUS . . . instead of RNU . . . R Miniature imperial bearing, example: R 4 Z MC3-H-
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