Welcome to WJW Bearings’ detailed overview of our NU Series Single Row Cylindrical Roller Bearings. These bearings are designed to handle high radial loads and high speeds, making them indispensable in heavy machinery, automotive, and industrial applications. In this article, we’ll explore their features, common applications, and highlight key models from our extensive inventory.
What Are NU Series Cylindrical Roller Bearings?
NU series bearings are single row cylindrical roller bearings with a flangeless outer ring and two integral flanges on the inner ring. This design allows the inner ring to move axially relative to the outer ring, accommodating thermal expansion and shaft misalignment while maintaining high radial load capacity. They are separable, simplifying mounting and dismounting.
Key characteristics:
- High radial load capacity
- Low friction, suitable for high-speed operation
- Axial displacement capability (non‑locating bearing)
- Optional cages (machined brass, steel, or polyamide) for different speeds and loads
Features & Benefits
- Optimized roller profile – reduces edge stresses and extends service life.
- High-quality steel – ensures durability under heavy loads.
- Advanced cage designs – brass (M), steel (no suffix), or polyamide for specific applications.
- Interchangeable with international standards – easy replacement.
- Variety of precision classes – from standard (P0) to high precision (P6, P5).
- Customizable with special coatings or dimensions upon request.
Typical Applications
Thanks to their robustness and speed capability, NU series bearings are widely used in:
- Electric motors and generators
- Gearboxes and transmissions
- Pumps and compressors
- Machine tool spindles
- Mining and construction equipment
- Wind turbines
- Railway axleboxes
Understanding NU Series Model Codes
Our NU series models follow a systematic naming convention that indicates size, design, and special features. For example:
- NU 2938 Q1 – “29” is the diameter series, “38” the bore size (38 × 5 = 190mm), Q1 denotes enhanced quality.
- NU 1034 M – “10” is the extra-light series, “34” the bore size (170mm), M indicates a machined brass cage.
- NU 2344 M/C3 – C3 internal clearance greater than normal.
Common suffixes:
- M – Machined brass cage
- EM – Optimized internal design with improved load distribution
- Q1 – High-quality, often with tighter tolerances
- C3 – Radial internal clearance greater than normal
- /HA – Hardened bearing rings
- /HC – Hybrid bearing with ceramic rolling elements
Featured Models & Size Groups
We stock hundreds of NU series bearings to meet diverse requirements. Below we’ve grouped them by approximate bore diameter and highlighted some popular, high-demand models. Click on any model number to view its detailed specifications.
Extra‑Light Series (Bore 50–200 mm)
Ideal for applications where space is limited but high load capacity is needed.
- NU1034M (170mm bore) – Brass cage, general industrial use
- NU1040M (200mm bore) – High speed, moderate loads
- NU1052M (260mm bore) – Extra‑light series, suitable for pumps
- NU1060M, NU1064M – Larger extra‑light models for compressors
Light Series (Bore 120–300 mm)
Balanced design for a wide range of machinery.
- NU2938Q1 (190mm bore) – Q1 quality, excellent for precision spindles
- NU2944Q1 (220mm bore) – High radial load capacity
- NU2344M/C3 (220mm bore) – C3 clearance for thermal expansion
- NU232E, NU232M, NU236M – Versatile models for gearboxes
Medium & Heavy Series (Bore 240–500 mm)
Designed for extreme loads and harsh environments.
- NU238M (190mm bore) – Medium series with brass cage
- NU240M (200mm bore) – Heavy‑duty applications
- NU244M, NU248M, NU252M – Progressive sizes for large rolling mills
- NU332M, NU334M, NU336M – Robust designs for mining equipment
Extra‑Large & Specialized Models (Bore >500 mm)
For heavy industries like steel, cement, and marine.
- NU18/600EM (600mm bore) – Extra‑light with EM design
- NU28/500EM, NU28/600EM – High‑capacity for wind turbines
- NU19/500EM, NU19/560EM – Large bore series for kilns
- NU30/500, NU30/600E – Ultra‑heavy duty applications
Note: Many models are available with alternative suffixes (C3, C9, /HA, /HC) to match specific operating conditions. Contact our team for availability.
Why Choose WJW Bearings for NU Series?
- Extensive stock – Over 500 NU series models ready to ship.
- Quality assurance – All bearings meet ISO 9001 standards.
- Customization – Non‑standard clearances, coatings, and hybrid options.
- Expert support – Our engineers help you select the right bearing for your application.
Explore the Full Range
This overview covers only a portion of our NU series portfolio. For a complete list of all available models, including dimensions, load ratings, and technical drawings, visit our dedicated series page: