Mining & Metallurgy
Crushers, mills, conveyors, and smelting equipment under heavy radial/axial loads.
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Full Traceability
ISO 9001 Certified
SKF Authorized
Angular Contact Bearing
High Precision SKF 3304-a Double Row Angular Contact Ball Bearing for CNC Automation Lines
High Precision SKF 3304-a Double Row Angular Contact Ball Bearing for CNC Automation Lines
In Stock · Ready to Ship
<p>Ensure your CNC automation lines run with uncompromising precision and minimal downtime using the <strong>SKF 3304-a Double Row Angular Contact Ball Bearing</strong>. Engineered to handle both radial and axial loads in high-speed machining environments, this bearing eliminates common headaches from inconsistent performance or unreliable supply chains.</p><ul><li>Double row angular contact design delivers superior rigidity for tight tolerance operations, keeping production within critical accuracy parameters</li><li>Available with precision ratings up to P2 and cage options including steel, copper, or nylon to match specific CNC spindle requirements</li><li>Backed by SKF's global quality standards and our direct authorized distribution, ensuring full traceability and batch consistency for seamless integration into your manufacturing process</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
High Precision SKF 3304-a Double Row Angular Contact Ball Bearing for CNC Automation Lines -- Parameter Sheet
SKF · Angular Contact Bearing
| Parameter | Value | Unit / Note |
|---|---|---|
| Bearing Series | -- | Angular Contact 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
-
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 Angular Contact Ball Bearing |
| Separated | Separated |
| Rows Number | Double |
| Load Direction | Radial Bearing |
| Material | Bearing Steel |
| Precision Rating | P0, P2, P4, P5, P6 |
| Type | Ball |
| Structure | Angular Contact |
| Cage | Steel Cage, Copper Cage, Nylon Cage |
| Lubrication | Oil Grease |
| Trademark | SKF |
| Origin | Jiangsu China |
Application Industries
| Industry | Typical Equipment |
|---|---|
| Manufacturing | CNC Automation Lines, Precision Machining Centers, Robotic Arms, Assembly Conveyors |
| Industrial Machinery | High-Speed Spindles, Gearboxes, Servo Motors, Linear Motion Systems |
Eliminate CNC Downtime with Authentic SKF 3304-a Double Row Angular Contact Ball Bearings
CNC automation lines rely on consistent precision, yet many manufacturers face unexpected shutdowns due to bearing failures. Counterfeit bearings often fail prematurely under high-speed rotation, while multi-tier distributors delay critical replacements by 30–50%. These issues disrupt production schedules and create avoidable costs for maintenance and lost output.
Genuine SKF 3304-a Bearings: In Stock and Traceable
As an official SKF distributor, we provide the SKF 3304-a Double Row Angular Contact Ball Bearing with full traceability documentation, ensuring you receive 100% authentic products. Our centralized warehouse maintains large inventories, enabling fast emergency delivery to keep your CNC automation lines operational. Each bearing undergoes ISO 9001-compliant quality checks, matching SKF global standards for reliable performance in precision machinery.
Optimal Performance in CNC Automation Environments
The SKF 3304-a Double Row Angular Contact Ball Bearing excels in high-speed, precision applications like CNC automation lines. Designed to handle combined radial and axial loads, it maintains stability during rapid acceleration and deceleration cycles. Its double row structure provides enhanced rigidity, critical for maintaining machining accuracy in automated production environments where minimal runout directly impacts part quality.
Technical Features That Ensure Reliability
The bearing's precision rating options (P0 to P6) allow customization for specific CNC requirements—P5 and P6 grades deliver tighter tolerances for high-precision spindles, reducing vibration and improving surface finish. Multiple cage materials offer flexibility: steel cages suit high-temperature operations, while nylon cages reduce noise in quiet workspaces. The separated design simplifies installation and maintenance, minimizing downtime during replacements. Lubricated with high-performance oil grease, it balances friction reduction and thermal stability under continuous operation.
Why Authenticity Matters for Your Bottom Line
Counterfeit bearings may cost less upfront, but they often lead to hidden expenses: early failures cause CNC line shutdowns, costing thousands in lost production. In contrast, genuine SKF 3304-a bearings provide predictable service life, reducing maintenance frequency and associated labor costs. Our traceability documentation eliminates customs clearance issues for exported machinery, ensuring compliance with international quality standards and avoiding costly shipment delays.
Our Commitment to Your Production Continuity
We serve 60+ countries worldwide, supporting industrial equipment OEMs and factory upgrading teams with reliable bearing solutions. Our SKF-certified technical team offers free model selection assistance, ensuring the 3304-a bearing matches your specific CNC application parameters. With a standardized 4-step OEM cooperation process, we provide formal quotations within 24 hours, support small-batch trials, and assign dedicated account managers to track every order from warehouse to delivery. Our global door-to-door logistics network ensures timely arrivals, even for urgent replacement needs.
Packaging & Shipping
- Original SKF packaging with protective carton and pallet reinforcement
- 现货 available for 3–7 business day delivery
- Flexible shipping via DHL, FedEx, UPS, air freight, or sea freight
- Real-time tracking number provided upon dispatch
- Minimum order quantity of 1 unit, supporting both emergency repairs and bulk procurement
Get Your CNC Line Back to Peak Performance
Delays in replacing worn bearings cost valuable production time. Send us your SKF 3304-a bearing requirements, including quantity and application details, and we’ll prioritize your order to minimize downtime. Our team ensures you receive the right bearing, on time, with the documentation needed to keep your CNC automation line running smoothly.
Frequently Asked Questions
Q: Are these genuine SKF bearings?
A: Yes, we are an official SKF distributor. Every SKF 3304-a bearing comes with full traceability documentation and brand authorization to confirm authenticity.
Q: How do I confirm if the 3304-a is suitable for my CNC machine?
A: Provide your machine 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 offer unconditional returns for verified manufacturing issues.
Q: What is the minimum order quantity?
A: We accept orders starting from 1 unit, ideal for emergency repairs or small-batch trials before full production runs.
Q: How quickly can you ship?
A: In-stock SKF 3304-a bearings ship within 3–7 business days via your preferred logistics method (DHL, FedEx, etc.).
Q: How can I verify the bearing’s authenticity?
A: Check the packaging for SKF’s holographicé˜²ä¼ªæ ‡ç¾, laser-etched part numbers, and scan the QR code to validate through SKF’s official database. We provide complete traceability certificates with each order.
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