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 NUP311 NUP312 for Air Compressor High Load Capacity
Double Row Cylindrical Roller Bearing NUP311 NUP312 for Air Compressor High Load Capacity
In Stock · Ready to Ship
<p>Ensure uninterrupted air compressor performance even under high loads with our <strong>Double Row Cylindrical Roller Bearing</strong> NUP311/NUP312, designed to eliminate costly production delays from unexpected bearing failures. Engineered with separated inner/outer rings for easy installation and maintenance, these non-aligning bearings deliver exceptional radial load capacity (C3 clearance standard) to handle the rigorous demands of industrial air compression systems.</p><ul><li>Bearing steel construction with 60-64 HRC hardness ensures long-term durability in high-stress environments</li><li>Brass or steel cage options provide tailored performance for specific operating conditions</li><li>Full traceability documentation included to streamline compliance and avoid customs clearance issues</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 NUP311 NUP312 for Air Compressor High Load Capacity -- 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 |
|---|---|
| Manufacturing | Air Compressors, Industrial Pumps, Gearboxes |
| Heavy Machinery | Hydraulic Presses, Injection Molding Machines |
| Energy | Reciprocating Compressors, Turbine Generators |
Prevent Costly Air Compressor Downtime with NUP311 and NUP312 Double Row Cylindrical Roller Bearings
Air compressor operators know the frustration of unexpected shutdowns—especially when caused by bearing failures. Counterfeit bearings often fail prematurely under high loads, leading to production halts that cost thousands in lost output. Sourcing genuine, high load capacity bearings with reliable delivery can be a constant challenge, with multi-tier distributors stretching lead times by 30–50%.
Genuine Double Row Cylindrical Roller Bearings for Critical Air Compressor Applications
Our NUP311 and NUP312 Double Row Cylindrical Roller Bearings are engineered to solve these pain points. As an official SKF authorized distributor, we ensure 100% genuine products with full traceability documentation, eliminating customs clearance obstacles. Our large centralized warehouse stocks these high load capacity bearings, enabling fast emergency delivery to keep your air compressors running.
Engineered for High Load Air Compressor Environments
These Non-Aligning Cylindrical Roller Bearings excel in air compressors where radial and axial loads combine. The separated roller design allows for easy installation and maintenance, while the robust bearing steel construction (60-64 HRC hardness) withstands the continuous pressure cycles typical in industrial compressor systems. Whether in piston or screw compressors, the C3 clearance option provides optimal performance under thermal expansion conditions.
Key Technical Features That Maximize Bearing Life
The double row configuration delivers superior load distribution compared to single row designs, increasing dynamic load handling critical for air compressor crankshafts and impeller shafts. Brass and steel cage options offer flexibility—brass cages excel in high-speed applications with better heat dissipation, while steel cages provide enhanced durability in heavy shock load scenarios. Vibration grades Z1V1 to Z3V3 ensure smooth operation, reducing noise and extending equipment lifespan by minimizing unnecessary wear.
Why Authentic Bearings Matter for Total Cost of Ownership
Choosing genuine Separated Roller Bearings for Air Compressors over gray-market alternatives directly impacts your bottom line. Counterfeit bearings often lack proper heat treatment, leading to early fatigue failure—costing not just the bearing replacement, but also downtime, labor, and potential damage to connected components. Our ISO 9001 compliant quality management ensures each bearing meets SKF global standards, reducing long-term maintenance costs by up to 40% compared to substandard alternatives.
Why Global OEMs Trust Our Bearing Supply
With over a decade serving 60+ countries, we’ve built a reputation for reliability in industrial bearing supply. Our SKF-certified technical team provides free application analysis to ensure proper bearing selection, while our dedicated account managers track every order from warehouse to delivery. We offer flexible OEM schemes, supporting both small-batch trials and bulk production orders with reserved inventory. Every shipment includes complete traceability certificates, giving you confidence in your supply chain compliance.
Packaging & Shipping
- Secure carton pallet packaging with SKF branding and product identification
- 现货 available for 3-7 business day delivery to most global locations
- Door-to-door logistics via DHL, FedEx, UPS, air, or sea freight
- Real-time tracking provided for all shipments
- Minimum order quantity of 1 unit, supporting emergency repairs and scheduled maintenance
Get Your Air Compressor Bearings Delivered Fast
Don’t let bearing issues disrupt your compressed air supply. Send us your NUP311 or NUP312 bearing requirements, including operating conditions and quantity, and our team will provide a formal quotation within 24 hours. With our stock availability, you can reduce inventory holding costs while ensuring critical spares are always on hand.
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 and brand authorization certificates to verify authenticity.
Q: How do I confirm if NUP311/NUP312 is the right bearing for my air compressor?
A: Provide your compressor model, operating speed, and load conditions. Our SKF-certified technical team will conduct a free application analysis to confirm compatibility.
What is your warranty policy?
A: All bearings are covered by SKF’s standard manufacturer warranty, with unconditional replacement for manufacturing defects.
What is the minimum order quantity?
A: We accept orders starting from 1 unit, supporting both emergency repairs and small-batch requirements.
How quickly can you ship these bearings?
A: In-stock bearings are shipped within 3-7 business days via your preferred logistics method (DHL, FedEx, UPS, air, or sea freight).
How can I verify the authenticity of the bearings?
A: Each bearing includes SKF’s original packaging withé˜²ä¼ªæ ‡ç¾, laser-etched part numbers, and traceability documents that can be verified through SKF’s official channels.
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