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 NNU4944 B/Sp C3 W33 for Industrial Machinery
Double Row Cylindrical Roller Bearing NNU4944 B/Sp C3 W33 for Industrial Machinery
In Stock · Ready to Ship
<p>Ensure consistent performance in heavy industrial machinery with the <strong>Double Row Cylindrical Roller Bearing NNU4944 B/Sp C3 W33</strong>, engineered to deliver reliable load distribution and extended service life. Its separated inner/outer ring design allows for easy mounting and dismounting, streamlining maintenance workflows and minimizing downtime.</p><ul><li>C3 clearance provides optimal operational flexibility under thermal expansion conditions, critical for high-torque applications</li><li>60-64 HRC hardness ensures superior wear resistance, reducing replacement frequency and long-term costs</li><li>Brass/steel cage options accommodate varying speed requirements, making it suitable for diverse industrial scenarios</li></ul><p>Backed by full traceability documentation and expert technical support, this bearing aligns with strict OEM quality standards to keep your production line running smoothly.</p>
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 NNU4944 B/Sp C3 W33 for Industrial 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 |
| Specification | As Your Request |
| HS Code | 8482800000 |
Application Industries
| Industry | Typical Equipment |
|---|---|
| Industrial Machinery | Heavy-duty gearboxes, machine tool spindles, large electric motors |
| Steel & Metallurgy | Rolling mill stands, continuous casting machines |
| Mining & Construction | Crushers, conveyor systems, excavator drivetrains |
| Power Generation | Steam turbines, generator sets, pump systems |
Reduce Downtime with Reliable NNU4944 B/Sp C3 W33 Double Row Cylindrical Roller Bearing
Industrial machinery operators know the cost of unexpected bearing failure—unplanned downtime, production losses, and emergency repair expenses. Many face challenges with counterfeit bearings that lack proper traceability, leading to premature failures and customs clearance issues. Multi-layer distribution channels further complicate matters, causing delivery delays that disrupt production schedules.
Genuine Double Row Cylindrical Roller Bearings Delivered When You Need Them
As an official SKF authorized distributor, we provide the NNU4944 B/Sp C3 W33 Double Row Cylindrical Roller Bearing with complete traceability documentation, ensuring you receive 100% genuine products. Our large centralized warehouse maintains stock for quick emergency delivery, eliminating the 30–50% lead time extension common with traditional distribution channels. This industrial machinery bearing is engineered to meet SKF global standards, making it suitable for critical applications requiring high load capacity and reliable performance.
Optimal Performance in Demanding Industrial Conditions
The NNU4944 B/Sp C3 W33 Bearing excels in applications involving heavy radial loads and moderate axial loads, typical in industrial machinery such as gearboxes and large motors. Its double row design provides increased rigidity and load-carrying capacity, while the separable inner and outer rings allow for easy installation and maintenance. With a C3 clearance rating, this bearing accommodates thermal expansion and misalignment, ensuring stable operation even in fluctuating temperature environments.
Key Technical Features for Enhanced Machinery Performance
The bearing's 60-64 HRC hardness ensures excellent wear resistance and durability, critical for extended service life in high-stress industrial settings. Available with brass or steel cages, the design optimizes roller guidance and load distribution—brass cages offer superior strength for heavy loads, while steel cages provide cost-effective performance for standard applications. Vibration class options (Z1V1 to Z3V3) allow customization based on noise and precision requirements, with higher classes reducing vibration levels for sensitive machinery. The separated construction facilitates easy mounting and dismounting, simplifying maintenance procedures and minimizing downtime during inspections.
Long-Term Value: Genuine Bearings vs. Hidden Costs of Counterfeits
Choosing genuine Double Row Cylindrical Roller Bearings like the NNU4944 B/Sp C3 W33 avoids the hidden costs associated with counterfeit products. Fake bearings often fail prematurely due to substandard materials and manufacturing processes, leading to not just replacement expenses but also secondary damage to machinery components. In contrast, our ISO 9001-compliant quality management ensures consistent performance, reducing the total cost of ownership through longer service intervals and fewer unexpected failures. Full traceability documentation also eliminates customs clearance delays and liability risks, critical for international OEM operations.
Why Industrial Manufacturers Choose Our Bearing Solutions
Our position as an official SKF distributor guarantees full product traceability, with each bearing accompanied by certification documents linking it to SKF's global supply chain. Our SKF-certified technical team provides application-specific support, from model selection based on operating conditions to installation guidance and failure analysis. Serving over 60 countries worldwide, we offer global door-to-door logistics with real-time shipment tracking, ensuring on-time delivery regardless of location. For OEMs and maintenance providers, our customized supply schemes include dedicated inventory reservation and long-term framework agreements, stabilizing procurement and supporting production scheduling.
Packaging & Shipping
- Secure carton pallet packaging with protective cushioning to prevent damage during transit
- Expedited processing for in-stock items, with delivery within 3-7 business days
- Flexible shipping options including DHL, FedEx, UPS, air freight, and sea freight
- Comprehensive tracking information provided upon dispatch for full visibility
- Minimum order quantity of 1 unit, supporting both emergency repairs and bulk procurement
Get Your NNU4944 Bearing Shipped Today
Every day of equipment downtime impacts your bottom line. Whether you need a single NNU4944 B/Sp C3 W33 Bearing for emergency repair or a bulk order for production, we ensure fast response and reliable delivery. Send us your requirements now to get started—our team will process your request within 24 hours.
Frequently Asked Questions
Q: Are these genuine SKF bearings?
A: Yes, we are an official SKF authorized distributor. Every bearing comes with complete traceability documentation to confirm authenticity.
Q: How do I confirm if 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.
Q: What is the warranty policy?
A: All bearings are covered by SKF's standard manufacturer warranty, with replacement guaranteed for any manufacturing defects.
Q: What is the minimum order quantity?
A: We accept orders for 1 unit, ideal for emergency repairs, with volume discounts available for bulk purchases.
Q: How long does shipping take?
A: In-stock bearings ship within 3-7 business days via your preferred logistics method (DHL/FedEx/UPS/air/sea freight).
Q: How can I verify the bearing's authenticity?
A: Each bearing includes SKF's original packaging with防伪标签, laser-etched part numbers, and traceability certificates for verification.
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