# RN309E-11Y Versus Look-Alike Codes on the Same Catalog Line
Look-alike part numbers are the usual way a stores ticket goes wrong on a eccentric / XRT reducer cylindrical roller (no outer ring). Do not substitute a standard NJ309 or N309 with an outer ring, which will not fit the same reducer pocket. RN bearings are supplied without an outer ring so the housing raceway is the outer path. Confirm the 11Y suffix and the reducer model.
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RN309E-11Y is listed as an eccentric / XRT reducer cylindrical roller (no outer ring). Because a public millimetre sheet is thin on some catalog pages, confirm bore, outside diameter, and width against your drawing or the live product listing.
Review RN309E-11Y bearing on the TFL Bearing Made-in-China listing. Shandong TFL Bearing Co., Ltd can confirm stock, packing, and any OEM marking once the drawing or sample is attached.