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 NNU4930 B/Sp C3 W33 for Mining Heavy Load Applications
Double Row Cylindrical Roller Bearing NNU4930 B/Sp C3 W33 for Mining Heavy Load Applications
In Stock · Ready to Ship
<p>Ensure uninterrupted mining operations with the <strong>Double Row Cylindrical Roller Bearing NNU4930 B/Sp C3 W33</strong>, engineered to deliver exceptional load capacity and reliability in heavy-duty applications. This precision bearing minimizes downtime risks by handling extreme radial loads while maintaining optimal clearance (C3) for temperature-induced expansion, a critical feature for continuous mining machinery operation.</p><ul><li>Separated inner/outer rings enable easy mounting and replacement, reducing maintenance time and keeping your equipment back online faster</li><li>Brass cage construction ensures high-temperature stability and extended service life under harsh working conditions</li><li>Compliant with SKF global standards through our authorized distribution channel, providing full traceability documentation to streamline your supply chain compliance</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 NNU4930 B/Sp C3 W33 for Mining Heavy Load Applications -- 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 |
|---|---|
| Mining & Construction | Crushers, Conveyors, Mining Drills |
| Heavy Machinery | Industrial Gearboxes, Rolling Mills |
Stop Mining Equipment Downtime — NNU4930 B/Sp Double Row Cylindrical Roller Bearing for Heavy Loads
Mining operations lose thousands daily to unexpected bearing failures. Counterfeit bearings often collapse under heavy loads within weeks, while multi-tier distributors delay critical replacements by 30–50%. For mining machinery handling tons of material, unreliable bearings aren’t just a cost—they’re a production stopper.
Genuine Heavy Load Bearings, In Stock and Traceable
Our NNU4930 B/Sp Double Row Cylindrical Roller Bearing solves these pain points with SKF-certified quality and direct distribution. As an official SKF distributor, we maintain large centralized warehouses to ensure this C3 clearance, W33 cylindrical bearing is ready for immediate dispatch. Designed for mining machinery’s extreme conditions, it delivers the batch stability OEMs need to keep production lines running.
Engineered for Mining’s Toughest Conditions
This double row cylindrical roller bearing excels in heavy radial load applications with moderate axial loads—ideal for mining crushers, conveyors, and gearboxes. Its separated inner and outer rings allow easy mounting, while the robust brass or steel cage maintains roller alignment under high shock loads. Operating in dust, vibration, and variable temperatures, it outperforms standard bearings in mining’s harsh environment.
Technical Details That Maximize Uptime
The NNU4930 B/Sp’s C3 clearance accommodates thermal expansion in high-temperature mining operations, preventing premature seizure. With 60-64 HRC hardness, its bearing steel construction resists wear even under continuous heavy loads. The Z3V3 vibration class ensures smooth operation, reducing noise and extending adjacent component life. For mining OEMs, these specifications translate to fewer replacements and longer equipment intervals between maintenance.
The Hidden Cost of Cutting Corners on Bearings
Counterfeit mining bearings may cost less upfront, but they typically fail within 30% of the expected service life. A single conveyor shutdown in a mine can cost $20,000 per hour in lost production. Our genuine SKF bearings, compliant with ISO 9001 standards, eliminate this risk. With full traceability documentation, they also prevent customs clearance delays—critical for global mining operations. The total cost of ownership favors genuine bearings by 4:1 over three years.
Why Mining OEMs Choose Our Bearings
As Dunyu Bearings, SKF’s official authorized distributor, we provide 100% genuine products with full certification. Our SKF-trained technical team offers free application analysis to ensure proper bearing selection. With a 60+ country client base, we’ve delivered over 1 million units to mining operations worldwide. Our 24-hour quotation response and dedicated account managers streamline procurement, while global door-to-door logistics ensure on-time delivery—even to remote mining sites.
Packaging & Shipping
- Original SKF packaging with anti-counterfeit labels and batch traceability documentation
- Stock items shipped within 3–7 business days via DHL, FedEx, or UPS
- Bulk orders available on framework agreements with reserved inventory
- Real-time tracking provided for all shipments
- Minimum order quantity: 1 unit, supporting emergency repairs and small-batch trials
Get Your NNU4930 Bearing Shipped Today
Every day your mining equipment waits for bearings is a day of lost revenue. Send us your order details—bearing designation, quantity, and delivery location—and our team will confirm stock and provide a formal quote within 24 hours. For urgent cases, we prioritize emergency shipments to minimize downtime.
Frequently Asked Questions
Q: Are these genuine SKF bearings?
A: Yes, we are an official SKF authorized distributor. Every bearing comes with SKF certification and full traceability documentation to verify authenticity.
Q: How do I confirm this bearing fits my mining equipment?
A: Provide your equipment model or operating parameters (load, speed, temperature), and our SKF-certified technical team will verify compatibility at no cost.
Q: What is the warranty policy?
A: All bearings come with SKF’s standard manufacturer warranty, covering defects in materials and workmanship. We handle full warranty claims directly with SKF.
Q: What is the minimum order quantity?
A: We accept orders of 1 unit, ideal for emergency repairs or small-batch testing before full production orders.
Q: How quickly can you ship to remote mining locations?
A: Stock bearings ship within 3–7 business days. For remote areas, we coordinate with local logistics partners to ensure delivery, including customs clearance support.
Q: How can I verify the bearing’s authenticity upon receipt?
A: Check the SKF packaging for holographic labels, scan the QR code to access batch data, and verify the laser-etched part number matches your order. We also provide a signed certificate of authenticity with each shipment.
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