Types of cylindrical roller bearings

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Prefix	Description	Application Scenario
NJ	Single-row cylindrical roller bearing with one fixed flange on the outer ring; inner ring has two flanges.	Used in applications where axial movement of the shaft needs to be restricted on one side (e.g., conveyor rollers).
NU	Single-row cylindrical roller bearing with no flanges on the outer ring; inner ring has two flanges.	Ideal for shafts requiring free axial expansion (e.g., automotive crankshafts).
NUP	Single-row cylindrical roller bearing with one fixed flange on the outer ring and a loose flange ring (separable) on the outer ring; inner ring has two flanges.	Provides higher axial load capacity than NJ bearings (e.g., machine tool spindles).
RNA	Full-complement cylindrical roller bearing (no cage); outer ring has two flanges, inner ring has no flanges.	Used for heavy radial loads with low to moderate speeds (e.g., agricultural machinery).
SS	Bearings made of stainless steel (AISI 440C or similar).	Suitable for corrosive environments (e.g., food processing equipment, marine applications).

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