Mining & Metallurgy
Crushers, mills, conveyors, and smelting equipment under heavy radial/axial loads.
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100% Genuine SKF
Full Traceability
ISO 9001 Certified
SKF Authorized
Cylindrical Roller Bearings
Double Row Cylindrical Roller Bearing NNU4924 B/Sp W33 for Power Transmission Machinery
Double Row Cylindrical Roller Bearing NNU4924 B/Sp W33 for Power Transmission Machinery
In Stock · Ready to Ship
<p>Boost power transmission efficiency in heavy machinery with the <strong>Double Row Cylindrical Roller Bearing NNU4924 B/Sp W33</strong>, engineered to deliver stable performance under high radial loads. Its separated inner/outer ring design allows easy mounting and dismounting, streamlining maintenance workflows for production-critical equipment.</p><ul><li>Precision-grade C0-C5 clearance options ensure optimal load distribution, reducing vibration (Z1V1-Z3V3 class) and extending machinery uptime</li><li>60-64 HRC hardness rating guarantees durability in continuous operation, ideal for industrial power transmission systems</li><li>Backed by full traceability documentation and SKF-certified technical support, ensuring compliance with strict OEM quality standards</li></ul>
Bore (d)
--
Outer Dia. (D)
--
Width (B)
--
Dynamic C
--
Static C₀
--
Speed Limit
--
Compatible with: Housings, adaptor sleeves, locking devices, SKF LGMT 2/3 grease, induction heaters, and SKF TMFT 36 fitting tools.
Formal quotation with SKF traceability cert within 24 hours · Sample orders available
24h Response
Quotation & Cert
60+ Countries
DDP/DAP/CIF
ISO 9001
Quality Certified
Full Specifications
Complete Technical Parameters
Double Row Cylindrical Roller Bearing NNU4924 B/Sp W33 for Power Transmission Machinery -- Parameter Sheet
SKF · Cylindrical Roller Bearings
| Parameter | Value | Unit / Note |
|---|---|---|
| Bearing Series | -- | Cylindrical Roller Bearings |
| Bore Diameter (d) | -- | mm |
| Outer Diameter (D) | -- | mm |
| Width / Height (B) | -- | mm |
| Dynamic Load Rating (C) | -- | kN |
| Static Load Rating (C₀) | -- | kN |
| Fatigue Limit Load (Pu) | -- | kN |
| Reference Speed | -- | r/min |
| Limiting Speed | -- | r/min |
| Mass | -- | kg |
| Clearance Class | C3 | ISO 281 |
| Cage Material | -- | -- |
| Sealing / Shield | -- | -- |
| Lubrication | Grease / Oil bath | -- |
| Operating Temp. Range | −30 to +120 °C | -- |
| Vibration Level | SKF E1 / Standard | -- |
| Misalignment Tolerance | -- | ° |
| Fit Recommendation (shaft) | -- | ISO |
| Fit Recommendation (housing) | -- | ISO |
| Replacement / Cross Ref. | -- | -- |
* All specifications are reference values. Contact our SKF engineers for application-specific confirmation.
Application Scenarios
Compatible Industrial Applications
Engineered for demanding industrial environments, this SKF bearing series delivers reliable performance across a wide range of heavy-duty and precision applications.
Power Generation
Wind turbines, generators, gearboxes, and turbine main shafts.
Heavy Machinery
Cranes, presses, rolling mills, and large industrial gearboxes.
Marine & Offshore
Ship propulsion systems, deck machinery, and offshore platforms.
Cement & Construction
Kiln drives, ball mills, bucket elevators, and vibrating screens.
Pulp & Paper
Paper machine rolls, dryer sections, and calender rolls.
Full Portfolio
One-Stop SKF Supporting Solutions
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Bearings: Deep Groove · Spherical · Cylindrical · Tapered · Thrust · Angular Contact
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Sealing: Radial shaft seals · V-rings · Labyrinth seals · Bearing isolators
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Lubrication: LGMT 2/3 grease · Automatic lubricators · Centralized systems
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Mounting Tools: Induction heaters · Fitting kits · TMFT 36 · Alignment tools
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Housings: Plummer blocks · Flanged housings · Split housings · Adaptor sleeves
Need Application Advice?
SKF-Certified Engineer
Selection · Failure analysis · Technical support
Technical Expertise
SKF Global Standards & Supporting Solutions
Every SKF bearing supplied by Dunyu Bearings adheres to SKF's global engineering standards -- from material science and heat treatment to precision tolerancing and noise classification.
Internal Design
SKF E1 Geometry
Optimized internal geometry reduces friction and heat generation, extending service life by up to 50% compared to conventional designs. Ideal for high-speed and high-temperature applications.
ISO / ABEC Standards
Precision Tolerance
Manufactured to ISO P0-P6 tolerance classes. Dimensional accuracy and running accuracy are 100% verified before shipment, with full batch traceability records.
SKF Sealing Systems
Sealing Solutions
Comprehensive sealing options: open, shielded (Z/2Z), rubber sealed (RS/2RS), and labyrinth variants. SKF V-rings and radial shaft seals available as integrated solutions.
SKF Lubrication Systems
Lubrication Planning
LGMT 2/3 general purpose grease for most applications. LGEP 2 for heavy loads, LGHP 2 for high temperatures. SKF automatic lubricators (SYSTEM 24) for continuous re-lubrication.
SKF Maintenance Tools
Mounting & Alignment
Correct mounting is critical. SKF TMFT 36 fitting tool kit, induction heaters (TIH 030M/100M), and laser alignment tools ensure damage-free installation and maximum service life.
Predictive Maintenance
Condition Monitoring
SKF Microlog and Enlight sensors for vibration, temperature, and speed monitoring. Enable predictive maintenance strategies to minimize unplanned downtime and optimize bearing replacement intervals.
Product Details
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 |
|---|---|
| Power Transmission | Gearboxes, Reducers, Electric Motors, Conveyors |
| General Machinery | Machine Tools, Pumps, Compressors, Fans |
| Industrial Manufacturing | Production Line Equipment, Material Handling Systems |
Stop Production Delays with Reliable NNU4924 B/Sp W33 Double Row Cylindrical Roller Bearings
Equipment downtime from bearing failure costs manufacturers thousands daily. Counterfeit bearings often fail prematurely under heavy loads, while multi-tier distribution channels stretch delivery times by 30-50%, leaving production lines idle. For power transmission machinery, selecting the wrong bearing type can lead to increased vibration, higher energy consumption, and costly repairs.
Genuine SKF Bearings with Full Traceability and Fast Delivery
As an official SKF authorized distributor, we provide 100% genuine Double Row Cylindrical Roller Bearings like the NNU4924 B/Sp W33, complete with certification and traceability documents. Our large centralized warehouse ensures stable bulk supply, while global door-to-door logistics means you get the bearings you need when you need them—critical for minimizing downtime in gearboxes and electric motors.
Optimized Performance in Heavy-Duty Power Transmission
The NNU4924 B/Sp W33 Double Row Cylindrical Roller Bearing excels in high-load, high-speed applications typical in power transmission machinery. Its separated design allows for easy mounting and dismounting, while the W33 lubrication groove and holes ensure efficient lubricant distribution—essential for maintaining performance in continuous operation. Whether handling axial loads in reducers or radial loads in conveyors, this bearing delivers consistent stability.
Technical Features That Maximize Machinery Uptime
The bearing's 60-64 HRC hardness ensures excellent wear resistance, extending service life even under heavy cyclic loads. Available clearance grades (C0 to C5) allow precise matching to operating conditions—tighter clearances (C2) for high-precision machine tools, looser clearances (C4/C5) for applications with temperature variations. The brass or steel cage options provide durability; brass cages offer better heat dissipation in high-speed scenarios, while steel cages suit heavier shock loads. Vibration classes Z1V1 to Z3V3 let you select the right balance between noise reduction and dynamic performance for your equipment.
Why Genuine Bearings Lower Total Cost of Ownership
Counterfeit bearings may cost less upfront, but their higher failure rate leads to hidden expenses: unplanned downtime, replacement labor, and potential damage to adjacent components. Our SKF Cylindrical Roller Bearings meet ISO 9001 and SKF global standards, reducing the risk of premature failure. With proper selection—matching clearance, cage material, and vibration class to your specific application—you’ll see longer service intervals, lower maintenance costs, and improved energy efficiency, ultimately lowering total ownership costs.
Your Trusted Partner for Industrial Bearing Solutions
With over a decade serving 60+ countries, we’ve built our reputation on four pillars: official authorization ensuring full product traceability, a certified technical team providing application-specific guidance, centralized warehousing for stable supply, and a 24-hour quotation response time. Every bearing undergoes pre-shipment inspection, and we offer a dedicated account manager to track your order from warehouse to delivery. Our OEM-focused service includes sample testing, small-batch trials, and long-term supply agreements tailored to your production schedule.
Packaging & Shipping
- Original SKF packaging with certification documents and traceability information
- Reinforced carton pallet packaging for secure transport
- Global door-to-door logistics via DHL, FedEx, UPS, air, or sea freight
- Real-time shipment tracking provided upon dispatch
- Flexible order quantities: 1 piece起订 for emergency repairs, bulk orders supported
Get Your NNU4924 B/Sp W33 Bearing Shipped Today
Every day your equipment is down costs money. Send us your bearing model, application details (load, speed, operating temperature), and required quantity, and our technical team will confirm compatibility and issue a quotation within 24 hours. With our large inventory, we can ship immediately—getting your production line back to work faster.
Frequently Asked Questions
Q: Are these genuine SKF bearings?
A: Yes, we are an official SKF authorized distributor. Every bearing comes with complete certification and traceability documents to confirm authenticity.
Q: How do I confirm this bearing fits my equipment?
A: Provide your equipment model or operating parameters (load, speed, temperature), and our SKF-certified technical team will verify compatibility and recommend the right clearance and cage material.
Q: What is the warranty policy?
A: All bearings come with SKF's standard manufacturer warranty, covering defects in materials and workmanship. We provide full after-sales support for warranty claims.
Q: What is the minimum order quantity?
A: We accept orders for 1 piece, supporting emergency maintenance needs, and also offer bulk pricing for production requirements.
Q: How long does shipping take?
A: In-stock bearings ship within 3-7 business days. We offer express delivery options for urgent orders and can arrange sea freight for large bulk shipments.
Q: How can I verify the bearing's authenticity?
A: Each bearing includes SKF's original packaging with holographic labels, laser-etched part numbers, and a unique traceability code that can be verified through SKF's official channels. We also provide a copy of our authorization certificate upon request.
Ready to order or need a quote?
Send your bearing designation, application details, and quantity — we'll respond within 24 hours.
Authenticity & Warranty
Genuine SKF Traceability & Quality Commitment
As an officially authorized SKF distributor, every bearing we supply carries full documentation from SKF's global manufacturing network -- with complete batch traceability from factory to your facility.
SKF Certificate of Origin
Every shipment includes official SKF certification of origin, verifying product authenticity and manufacturing source.
Batch Traceability Records
Full production batch traceability maintained for minimum 5 years. Enables quality audit and failure investigation.
SKF Authorized Distributor Status
Verified annually by SKF. Our authorized status can be confirmed directly through the SKF distributor verification system.
Quality Warranty
All products carry SKF manufacturer warranty. Defective products are replaced or refunded -- no questions asked.
Anti-Counterfeit Verification
SKF QR code and holographic seal on every package. Verify authenticity instantly via SKF's official verification portal.
Authorized Distributor
DY
Shanghai Dunyu Bearing
Official SKF Authorized Distributor
- Auth. Since
- 2010+
- Quality Std.
- ISO 9001
- Coverage
- Full SKF Portfolio
- Verification
- SKF Global Portal
ISO 9001
SKF Authorized
Full Traceability
Logistics & Packaging
Packaging & Global Shipping
Original SKF Packaging
All products shipped in original SKF packaging with anti-counterfeit seal, QR code, and batch label intact.
Export Carton + Wooden Crate
Standard export carton for small orders. Custom wooden crates with moisture-proof lining for large/heavy shipments.
Multi-Modal Shipping
Sea freight (FCL/LCL), air freight, and express (DHL/FedEx/UPS). DDP, DAP, CIF, FOB terms all supported.
Delivery Timeline
In-stock items: 1-3 days dispatch. Air freight: 3-7 days door-to-door. Sea freight: 15-35 days by destination.
Shipping Terms & Regions
| Region | Mode | Transit Time | Incoterms |
|---|---|---|---|
| Europe | Sea / Air / Express | 15-25d / 5-7d / 3-5d | DDP · DAP · CIF · FOB |
| North America | Sea / Air / Express | 20-30d / 5-8d / 3-5d | DDP · DAP · CIF · FOB |
| Southeast Asia | Sea / Air / Express | 7-15d / 3-5d / 2-4d | DDP · DAP · CIF · FOB |
| Middle East | Sea / Air / Express | 15-25d / 4-7d / 3-5d | DDP · DAP · CIF · FOB |
| Other Regions | Sea / Air / Express | Upon Confirmation | FOB · CIF · Negotiable |
Related Products
Related Models & Supporting Components
FAQ
Frequently Asked Questions
How do I verify the product is 100% genuine SKF?
Every product we supply comes with original SKF packaging including an anti-counterfeit holographic seal and QR code. You can scan the QR code on the SKF official website to verify authenticity. We also provide the SKF Certificate of Origin with every shipment, and our authorized distributor status can be verified directly through SKF's global distributor portal.
What is the minimum order quantity (MOQ)?
There is no strict minimum order quantity for standard catalog items. We support single-piece sample orders for testing and evaluation. For bulk procurement and long-term supply programs, we offer preferential pricing and dedicated inventory reservation. Contact our sales team for a customized procurement plan.
How long does it take to receive a formal quotation?
We guarantee a formal quotation with full SKF traceability certification within 24 business hours of receiving your inquiry. For urgent requirements, our team can typically respond within 2 hours during business hours (Mon-Sat, 9:00-18:00 GMT+8). Contact us via WhatsApp for fastest response.
Do you support DDP (Delivered Duty Paid) shipping?
Yes, we fully support DDP, DAP, CIF, and FOB incoterms across 60+ countries. Our logistics team handles all export documentation, customs clearance, and last-mile delivery. We work with leading freight forwarders and express carriers (DHL, FedEx, UPS) to ensure reliable and timely delivery.
Can you provide technical support for bearing selection?
Absolutely. Our SKF-certified engineers provide comprehensive technical support including bearing selection, application analysis, failure investigation, and lubrication planning. We can also assist with housing selection, mounting tool recommendations, and condition monitoring solutions. Technical support is available 24/7 via email and WhatsApp.
What are the payment terms?
We accept T/T (bank transfer), L/C (letter of credit) for large orders, and Western Union. Standard terms are 30% deposit with 70% balance before shipment. For established long-term customers with framework agreements, we offer net payment terms. All transactions are conducted in USD or EUR.
What happens if I receive a defective product?
All products carry the full SKF manufacturer warranty. In the unlikely event of a defective product, we will arrange replacement or full refund -- no questions asked. Our quality team will also conduct a failure analysis to identify the root cause and prevent recurrence. Please retain the original packaging and documentation for warranty claims.
Still have questions? Chat with our SKF engineers →
Start Your Procurement
Get a Formal Quote
Within 24 Hours.
Send us your bearing model, quantity, and delivery requirements. Our SKF-certified team will respond with a formal quotation, traceability certificate, and logistics plan.
- 100% Genuine SKF with Certificate of Origin
- Formal quotation within 24 hours
- Sample orders & bulk supply supported
- DDP/DAP/CIF to 60+ countries
- Dedicated SKF-certified account manager
Send Inquiry -- SKF Bearing Specialist Online