... of the drive shaft.2. Self-aligning ball bearings are constructed with the inner ring and ball assembly contained within an ... oil holes are arranged on the outer ring of the bearing.4. The self-aligning roller bearing, which is suitable for ... SeriesSeries 23000, 24000, 23200, 22200, 22300, 23100,2410023900,etc. Ring MaterialChrome Steel ,Carbon steel,Stainless steel Tolerance gradeGB/T307.1 ...