Cylindrical Roller Bearing NU 220

Nothing causes greater concern for technicians than a machine breakdown mid-shift due to a minor bearing fault. The Cylindrical Roller Bearing NU 220 is the pivotal choice for heavy-load systems that demand the highest precision and durability—especially where every minute of downtime risks project delays or contractual penalties. Selecting the correct genuine bearing, available in stock with complete certification, is the simplest way to safeguard both the plant’s reputation and production schedule.

Advantages & highlights of ZWZ NU 220 bearing

The ZWZ NU 220 Cylindrical Roller Bearing stands out with its superior radial load capacity and optimized design that minimizes deformation, delivering extended service life and reducing unexpected failures in cement, steel, and wind power industries.

Its cylindrical roller construction, featuring line contact and rigid rib-cage geometry, makes the NU 220 suitable for heavy loads and high-vibration conditions, thereby reducing wear and unplanned downtime.

Although no publicly available MTBF data exists specifically for ZWZ NU 220, industry studies confirm that extending bearing life can reduce maintenance costs by up to 50% in cement pump applications or double to triple lifespan in steel rolling mills when advanced materials and sealing solutions are used.

Between 2021–2024, ZWZ repeatedly delivered ahead of schedule on critical projects: 3.3MW wind turbine bearings shipped 18 days early, and high-precision industrial gearboxes supplied ahead of deadline—demonstrating fast response capability and on-site technical support highly valued by clients needing to minimize downtime.

Case studies in cement plants show that accurate failure prediction can generate indirect economic benefits of up to USD 10 million annually—further reinforcing the value of rapid support and high-quality products.

With the ZWZ NU 220, factories can expect lower cost per operating hour, safeguarded project timelines, and reduced downtime risk—key factors for plant owners and technical managers seeking cost-effective, quick-delivery solutions with complete documentation.

Technical specifications of NU 220 bearing

• Standard ISO dimensions: bore 100 mm, outside diameter 180 mm, width 34 mm – suitable for industrial machines requiring fast, precise, and highly compatible replacements.

• Dynamic load rating (C): depending on brand – SKF: 285 kN, NTN: 203 kN, ZWZ approx. 300 kN (NU 220 M).

• Limiting speed: SKF/NTN up to 4,500 rpm (oil), ZWZ NU 220 M approx. 4,200 rpm (to be verified by specific model).

• Weight: NTN lists 3.33 kg, while ZWZ commercial versions range from 3.5–4.5 kg depending on material and cage design.

Applications of NU 220 bearing

The NU 220 Cylindrical Roller Bearing is commonly applied in positions subject to heavy radial loads within gearboxes, crusher shafts, and heavy-duty industrial drives. ZWZ NU 220 is widely used in cement, steel, and wind energy sectors.

• Cement industry: Installed in main shafts of vertical mills, gearboxes, and conveyors—locations with high loads and continuous operation.

• Steel industry: Applied in rolling mill shafts, reduction gears, and auxiliary drives—where both high temperatures and pressures exist.

• Wind power: Used as the free-end bearing in 2MW turbine gearboxes, particularly in planetary and parallel stages.

Experimental research on turbine gearboxes shows bearing life can reach 20 years with only 0.4–1.5 replacements, provided oil cleanliness and viscosity are maintained. Engineers generally regard NU-series bearings as superior to ball bearings under heavy loads and harsh conditions such as dust, heat, and vibration.

The NU 220 is especially valued for its ability to withstand high radial loads while permitting axial displacement of the shaft—making it ideal for free-end positions. Customers consistently praise its reliability and ease of maintenance when properly installed, adequately lubricated, and with clean oil filtration.

Guidelines for ing & installing NU 220 cylindrical roller bearings

Selecting and installing the NU 220 begins with verifying the correct product code and specifications, such as 100×180×34 mm dimensions, cage type, and clearance (commonly C3). This ensures the NU 220 matches the actual speed, load, and temperature conditions of the application.

Before installation, carefully inspect shaft and housing surfaces—ensuring no wear or scratches and compliance with ZWZ’s tolerance and surface finish recommendations. This step prevents slippage and vibration, the primary causes of premature failure.

During installation, use specialized equipment such as induction heaters for the inner ring and presses for the outer ring—never apply direct hammering, which risks deformation.

After mounting, apply the correct type and quantity of lubricant according to load/thermal guidelines, ensuring dust-proof sealing. Conduct a low-load trial run to measure temperature, noise, and torque before full-load operation.

Particularly with NU-design bearings allowing axial displacement, ensure shaft positioning with another locating bearing or axial limiting mechanism.

Finally, always refer to ZWZ catalogues for installation diagrams, tolerances, and detailed technical specifications—helping to avoid common errors such as incorrect clearance, improper tooling, or insufficient lubrication, which are the most frequent causes of early failures.

Whether you are a plant owner requiring a fast, cost-effective solution, or a technical engineer seeking a robust replacement line, the genuine ZWZ NU 220 is a safe and sustainable choice. Bejako Viet Nam Company Limited is proud to be the authorized distributor in Vietnam, providing genuine heavy-duty ZWZ bearings with full certification, on-site warranty, and rapid delivery. Visit bejako.vn for technical support and quotations tailored to your operational needs.