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operating conditions lubrication lubricants serve a number of very important purposes in ball bearings including · protecting bearing surfaces from corrosion · reducing rolling and sliding friction · preventing metal-to-metal contact between balls and raceway providing a barrier against external · contaminants grease removing heat oil · lack of lubrication or inadequate lubrication is the most common cause of bearing failure standard rbc thin section ball bearings are lubricated with either oil or grease the unsealed bearings the k series are thoroughly coated in mil-l-3150 oil and drained of excess ...

face-to-face df f-type radial play radial play diametral clearance is the distance the inner ring can be moved radially from one extreme position to the other standard rbc thin section ball bearings are manufactured with enough radial play that some clearance remains after the bearing is properly installed radial play preload · heavy radial loads · combined thrust radial loads · reversing thrust load · moment loads when there is negative radial play diametral preload there is interference rather than clearance between the balls and the races as the interference increases the friction stiffness ...