# How to Specify NJ shaft-positioning cylindrical roller Without Mixing Nearby Parts
Look-alike part numbers are the usual way a stores ticket goes wrong on a NJ-series cylindrical roller bearing for shaft positioning. Do not substitute an NU type (no flanges on the inner ring) when the design needs NJ locating shoulders. No public model size is listed. NJ geometry locates the shaft axially in one direction; confirm the series size on the drawing.
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NJ shaft-positioning cylindrical roller is listed as an NJ-series cylindrical roller bearing for shaft positioning. 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 NJ shaft-positioning cylindrical roller 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.