Product Specifications
| Parameter |
Details |
| Model NO. |
Double Row Cylindrical Roller Bearing |
| Outer Dimension |
Medium and Large(120-190mm) |
| Material |
Bearing Steel |
| Spherical |
Non-Aligning Bearings |
| Load Direction |
Axial Bearing |
| Separated |
Separated |
| Clearance |
C0 C2 C3 C4 C5 |
| Cage |
Brass, Steel |
| Vibration |
Z1V1 Z2V2 Z3V3 |
| Hardness |
60-64 HRC |
| Transport Package |
Carton Pallet |
| HS Code |
8482800000 |
Application Industries
| Industry |
Typical Equipment |
| Construction Machinery |
Excavators, Loaders, Bulldozers |
| Mining |
Crushers, Conveyors, Mine Hoists |
| Steel |
Rolling Mills, Continuous Casters |
| Machine Tools |
CNC Lathes, Milling Machines, Spindles |
Minimize Downtime with NNU4921 B/Sp W33 Double Row Cylindrical Roller Bearing for Heavy Duty Machinery
Heavy duty machinery operators face constant challenges with bearing failures—unplanned downtime from premature wear can halt production lines for days, costing thousands in lost revenue. Sourcing reliable replacements often means coordinating with multiple suppliers, each with different lead times and quality standards. When every hour of operation counts, having a trusted partner for critical components like the NNU4921 B/Sp W33 Double Row Cylindrical Roller Bearing makes all the difference.
Double Row Cylindrical Roller Bearing Engineered for Heavy Loads
The NNU4921 B/Sp W33 Double Row Cylindrical Roller Bearing is designed to handle the extreme demands of heavy duty machinery. Its separated inner and outer rings allow for easy mounting and dismounting, a crucial feature during maintenance shutdowns. As an official distributor of globally recognized bearing brands, we maintain large centralized inventory to ensure this critical component is available when you need it most—no more waiting weeks for cross-brand transfers or minimum order quantity constraints.
Optimal Performance in High-Stress Industrial Environments
This Heavy Duty Cylindrical Roller Bearing excels in applications with high radial loads and moderate axial loads, common in construction equipment reducers, mining gearboxes, and steel mill rollers. The W33 lubrication groove and holes ensure consistent grease distribution, extending service life even in dusty or high-temperature conditions. With a hardness rating of 60-64 HRC, the bearing maintains dimensional stability under heavy loads, reducing the risk of deformation and premature failure.
Technical Features That Maximize Machinery Reliability
The bearing’s cage material—available in brass or steel—plays a key role in performance. Brass cages offer superior heat resistance and stability at high speeds, making them ideal for continuous operation in steel mills. Steel cages provide cost-effective durability for general industrial applications. Clearance options (C0 to C5) allow precise matching to operating conditions: tighter clearances (C2) reduce vibration in machine tool spindles, while larger clearances (C4, C5) accommodate thermal expansion in high-temperature environments. Vibration class Z1V1 to Z3V3 ensures smooth operation, minimizing noise and extending the life of adjacent components.
Why Genuine Bearings Reduce Total Cost of Ownership
Counterfeit bearings may offer lower upfront prices, but they often fail within months, leading to repeated replacements, unplanned downtime, and potential damage to expensive machinery. Our NNU4921 B/Sp W33 Bearing meets strict ISO 9001 quality standards, with each unit inspected before shipment. The investment in genuine components pays off through longer service intervals, fewer maintenance cycles, and reduced risk of catastrophic failures. In heavy duty applications, the cost of a single bearing failure can exceed ten times the price of a genuine replacement—making quality the most cost-effective choice.
Your Trusted Partner for Heavy Duty Bearing Solutions
As an official authorized distributor for leading bearing brands, we provide complete traceability for every NNU4921 B/Sp W33 Bearing, with documentation linking each unit to its manufacturing origin. Our cross-brand technical team, with expertise in both European precision and American heavy-duty designs, offers free application analysis to ensure proper bearing selection. With 1,200+ clients across 55+ countries, we’ve built a reputation for reliable supply—our large centralized inventory ensures 95% of standard bearings ship within 3 business days. Every order includes unified quality certification, simplifying compliance for large engineering projects.
Packaging & Shipping
- Protective carton packaging with palletization for bulk orders, ensuring damage-free transit
- 现货 available for urgent requirements, with standard delivery within 3-7 business days
- Flexible shipping options including DHL, FedEx, UPS, air freight, and sea freight to 55+ countries
- Real-time logistics tracking provided for all shipments, with dedicated support for customs clearance
- Minimum order quantity of 1 unit, supporting both emergency repairs and scheduled maintenance
Get Your NNU4921 B/Sp W33 Bearing Shipped Today
Don’t let bearing issues delay your project. Whether you need a single replacement for emergency repair or bulk quantities for scheduled maintenance, we’re ready to fulfill your order. Send us your bearing designation, application details, and required quantity—our team will confirm stock availability and provide a quotation within 24 hours. The faster you act, the sooner your machinery can return to full operation.
Frequently Asked Questions
Q: Are these genuine Double Row Cylindrical Roller Bearings?
A: Yes, as an official authorized distributor, all our bearings are sourced directly from original manufacturers and come with complete traceability documentation.
Q: How do I confirm if the NNU4921 B/Sp W33 is suitable for my equipment?
A: Provide your equipment model, operating speed, load conditions, and temperature range—our technical team will verify compatibility and recommend the optimal clearance and cage material.
Q: What warranty coverage do you offer?
A: We stand behind the quality of all products with a manufacturer-backed warranty covering material and manufacturing defects. Defective bearings will be replaced at no cost.
Q: What is the minimum order quantity for this bearing?
A: We accept orders for 1 unit, making us ideal for emergency repair situations where small quantities are needed quickly.
Q: How long does shipping take to my location?
A: Standard delivery takes 3-7 business days via express courier. For remote areas or large orders, sea freight options are available with transit times based on destination.
Q: How can I verify the authenticity of the bearing upon receipt?
A: Each bearing comes with original packaging, serial numbers, and certification documents. You can cross-check serial numbers with the manufacturer’s database, and our team can assist with verification if needed.
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