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 Bearing
Double Row Cylindrical Roller Bearing NNU4938 NNU4940 for Industrial Machinery with C3 Clearance
Double Row Cylindrical Roller Bearing NNU4938 NNU4940 for Industrial Machinery with C3 Clearance
In Stock · Ready to Ship
<p>Ensure stable high-load performance in industrial machinery with our <strong>Double Row Cylindrical Roller Bearing NNU4938 NNU4940</strong> featuring C3 clearance, designed to minimize downtime and enhance production continuity. As an official SKF authorized distributor, we guarantee 100% genuine bearings with full traceability documentation, eliminating compliance hurdles in global supply chains.</p><ul><li>Non-aligning design maintains precision under radial loads, ideal for heavy-duty equipment like gearboxes and presses</li><li>C3 clearance ensures optimal thermal expansion accommodation, preventing premature wear during continuous operation</li><li>Separated inner/outer rings enable easy mounting and replacement, reducing maintenance time and labor costs</li></ul>
Bore (d)
--
Outer Dia. (D)
--
Width (B)
--
Dynamic C
--
Static Câ‚€
--
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 NNU4938 NNU4940 for Industrial Machinery with C3 Clearance -- Parameter Sheet
SKF · Cylindrical Roller Bearing
| Parameter | Value | Unit / Note |
|---|---|---|
| Bearing Series | -- | Cylindrical Roller Bearing |
| Bore Diameter (d) | -- | mm |
| Outer Diameter (D) | -- | mm |
| Width / Height (B) | -- | mm |
| Dynamic Load Rating (C) | -- | kN |
| Static Load Rating (Câ‚€) | -- | 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 |
|---|---|
| Industrial Machinery | Gearboxes, Machine Tool Spindles, Rolling Mills, Compressors |
| Power Generation | Generator Sets, Turbines, Pumps |
| Heavy Manufacturing | Presses, Conveyors, Material Handling Equipment |
Minimize Downtime with Reliable NNU4938 and NNU4940 Double Row Cylindrical Roller Bearings
Production line shutdowns from bearing failures cost manufacturers thousands daily. Counterfeit bearings often fail prematurely under heavy loads, while multi-tier distribution channels delay critical replacements by weeks. For industrial machinery operators, finding a trustworthy source for precision bearings like the NNU4938 and NNU4940 with C3 clearance remains a constant challenge.
Authentic Double Row Cylindrical Roller Bearings with C3 Clearance, In Stock
As an official SKF distributor, we provide 100% genuine NNU4938 and NNU4940 Double Row Cylindrical Roller Bearings with full traceability documentation. Our large centralized warehouse maintains stock of these industrial machinery bearings, ensuring you avoid production delays. Each bearing undergoes rigorous quality checks compliant with ISO 9001 standards, making them ideal for high-load applications in gearboxes and machine tool spindles.
Optimal Performance in Heavy-Duty Industrial Environments
The NNU4938 and NNU4940 Non-Aligning Cylindrical Bearings excel in applications requiring high radial load capacity and precise axial guidance. With a hardness of 60-64 HRC, these bearings reliably operate in medium to large industrial machinery (120-190mm outer dimension) under continuous heavy loads. Their separated design allows for easy installation and maintenance, critical in time-sensitive production environments where equipment uptime directly impacts profitability.
Technical Features That Ensure Long-Term Reliability
The C3 clearance in these bearings provides optimal internal space for thermal expansion during high-speed operation, reducing friction and extending service life. Available with brass or steel cages, the design ensures stable roller guidance even under fluctuating loads. Vibration class Z1V1 to Z3V3 options allow customization based on noise sensitivity requirements—critical for precision machinery. The bearing steel construction delivers consistent hardness across the raceway, ensuring uniform load distribution and resistance to wear in demanding industrial settings.
Why Genuine Bearings Matter for Total Cost of Ownership
Counterfeit C3 Clearance Bearings may cost less upfront but typically fail within 30-50% of the expected service life of genuine parts. This leads to repeated replacements, unplanned downtime, and potential damage to mating components. Our NNU4938 C3 Clearance Bearing and NNU4940 C3 Clearance Bearing meet SKF global standards, providing predictable performance that reduces maintenance costs over time. For OEMs and maintenance teams, the reliability of genuine bearings translates to lower total cost of ownership and consistent production output.
Our Commitment to Your Production Success
With over a decade serving 60+ countries, we combine global supply chain strength with localized service. Our SKF-certified technical team provides free model selection support to ensure you get the right bearing for your specific operating conditions. Every order includes complete traceability documentation to simplify customs clearance and quality audits. We maintain dedicated inventory for long-term partners and offer emergency delivery options to minimize production disruptions. Our 24-hour quotation response ensures you can quickly secure the bearings you need without delays.
Packaging & Shipping
- Secure carton pallet packaging with protective inner wrapping to prevent damage during transit
- 3-7 business days delivery for in-stock items to most global destinations
- Flexible shipping options including DHL, FedEx, UPS, air freight, and sea freight
- Real-time tracking provided for all shipments
- Minimum order quantity of 1 unit, supporting both emergency repairs and bulk procurement
Get Your Industrial Machinery Bearings Delivered Fast
Every day your machinery is down costs money. Whether you need a single NNU4938 Bearing for emergency repair or bulk NNU4940 Bearings for production line maintenance, we have you covered. Send us your bearing requirements today and get back to full production faster.
Frequently Asked Questions
Q: Are these genuine SKF bearings?
A: Yes, we are an official SKF authorized distributor. Every bearing comes with full traceability documentation to confirm authenticity.
Q: How do I confirm if the NNU4938/NNU4940 is suitable for 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 your warranty policy?
A: All bearings come with the standard SKF manufacturer warranty, covering manufacturing defects with unconditional replacement.
Q: What is the minimum order quantity?
A: We accept orders for 1 unit, making us ideal for emergency repairs and small-batch requirements.
Q: How quickly can you ship?
A: In-stock bearings ship within 3-7 business days via your preferred logistics provider.
Q: How can I verify the bearing's authenticity?
A: Each bearing includes SKF's standard packaging withé˜²ä¼ªæ ‡ç¾ and traceability documents. We can also provide additional verification support 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