NU, NJ, NUP: what the letters mean
In a cylindrical roller bearing the rollers make line contact with the raceways instead of the point contact of a ball bearing. This gives a much higher radial load capacity and stiffness for the same size, while the rollers, guided by ribs and a cage, still allow high speeds.
The design letters describe where the ribs are. NU bearings have two ribs on the outer ring and none on the inner ring, so the shaft can move axially; they are ideal non-locating bearings that absorb thermal expansion. N types are the reverse. NJ bearings add one rib on the inner ring and locate the shaft in one direction, while NUP bearings add a loose rib for location in both directions. Full-complement versions without a cage carry even higher loads at lower speeds, and double-row designs are used in machine-tool spindles.
CPN cylindrical roller bearings are made to German standards with ISO-controlled factory quality control. Send us the full designation including suffixes (for example cage type or clearance) and we will quote a matching bearing.
Typical applications
- Electric motors & generators
- Gearboxes & speed reducers
- Pumps & compressors
- Rolling mills & steel plants
- Machine-tool spindles
- Rail vehicles & traction motors
- Vibrating screens & crushers
Key features & benefits
- Very high radial load capacity
- High stiffness from line contact
- Suitable for high speeds
- Non-locating designs absorb thermal expansion
- Separable rings for easy mounting
- German-standard quality
Available series
Designs and series in stock: [confirm stocked designs and series (NU, NJ, NUP, N; e.g. 2xx/3xx/22xx) and cage types]
How to order
- Send the part number, dimensions or a drawing, plus the quantity you need.
- Our team checks availability and suitable equivalents for your application.
- You receive a quotation with price and delivery time (typically 7–30 days).
