Aug 5, 2026 · Technical Resources
Custom OEM Bearing Preload Optimization for OE Applications – ISO 9001 Factory
Master OEM bearing prelo…
Read the selection guideSKF bearings by designation · Itemized written quotes for mixed project lists




State the exact execution (designation suffix), whether you need the complete assembly, and which housings or mounting accessories belong on the same line. Keep precision items separate, with accuracy class and arrangement.
Technical data
Listed data for this SKF designation; confirm the execution and dimensions against your drawing or application before ordering.
| Category | Spherical Roller Bearing |
|---|
| Parameter | Details |
|---|---|
| Model Number | 21310EK |
| Bearing Type | Self-Aligning Roller Bearings, Double Row |
| Bore Diameter (d) | 50mm |
| Outside Diameter (D) | 110mm |
| Width (B) | 27mm |
| Precision Rating | P0, P6, P5, P4, P2 |
| Clearance | C0, C3, C4 |
| Material | Bearing Steel |
| Load Direction | Radial Bearing |
| Separated | Unseparated |
| Trademark | SKF |
| Origin | Sweden |
| HS Code | 8482300000 |
| Package Size | 13.00cm * 13.00cm * 4.70cm |
| Package Gross Weight | 1.220kg |
| Industry | Typical Applications |
|---|---|
| Wind Power | Generator sets, gearboxes, pitch control systems |
| Steel Mills | Rolling mills, conveyor systems, continuous casting equipment |
Many industrial buyers face frustrating delays when sourcing critical bearings—especially hard-to-find models for wind turbines or steel mill equipment. Misalignment issues during installation, poor quality materials causing premature wear, and inconsistent supply from middlemen can lead to costly production downtime. When your machinery depends on precision components, choosing the right supplier matters as much as the bearing itself.
The SKF 21310EK double row self-aligning roller bearing addresses these challenges with its robust construction and engineering precision. As a specialized supplier with direct access to global distribution centers, we ensure 100% authentic SKF products that meet the original factory quality standards. This bearing’s 50x110x27mm dimensions make it ideal for applications requiring high radial load capacity and tolerance for shaft misalignment—common in wind power gearboxes and steel mill rolling equipment.
This self-aligning roller bearing excels in environments with heavy radial loads and moderate axial loads, operating efficiently even with shaft misalignment up to 2-3 degrees. The double row design distributes load evenly across rolling elements, reducing stress on individual components. In wind power applications, this translates to reliable performance in variable speed conditions, while steel mill operations benefit from its ability to withstand shock loads and continuous operation at elevated temperatures.
The bearing’s precision rating options (from P0 to P2) allow customization based on application requirements—higher precision grades for critical machinery where minimal vibration is essential. Clearance options (C0, C3, C4) accommodate thermal expansion in high-temperature environments, preventing seizure and extending service life. Constructed from high-quality bearing steel, it offers excellent wear resistance and fatigue strength, ensuring consistent performance even under cyclic loading common in industrial settings. The unseparated design simplifies installation and maintenance, reducing assembly time and potential errors.
Choosing the correct self-aligning roller bearing directly impacts your bottom line. Inferior bearings may cost less initially but often fail prematurely, leading to unplanned downtime, replacement labor, and potential damage to adjacent components. The SKF 21310EK’s design follows international standards for interchangeability, ensuring compatibility with existing equipment and reducing the need for costly modifications. By investing in authentic, high-precision bearings, you minimize maintenance intervals and extend the operational life of your machinery—ultimately lowering total cost of ownership.
Our commitment to quality begins with direct sourcing from SKF official factories and warehouses, eliminating middlemen and ensuring complete traceability. Every bearing undergoes rigorous inspection according to SKF’s global quality management system, with documentation including original factory certificates and batch inspection reports. We maintain a large-scale dedicated inventory, covering over 95% of SKF’s conventional models, supporting same-day shipping for spot goods. With export experience to over 40 countries, we understand the importance of reliable documentation and fast global delivery—typically 7-15 days door-to-door to most regions.
Whether you need a single SKF 21310EK bearing for maintenance or bulk quantities for production, we can fulfill your requirements. Provide your specific model, quantity, and delivery location, and our technical team will confirm availability and provide a competitive quote. With our professional support and reliable supply chain, you can keep your operations running smoothly without unnecessary delays.
Q: Do you supply bearings from other brands besides SKF?
A: Yes, we provide a full range of bearings from international brands including NSK, NTN, Koyo, NACHI, IKO, FAG, Timken, and domestic Chinese brands, based on customer specifications.
Q: How can I confirm if the SKF 21310EK is compatible with my equipment?
A: Share your equipment model or existing bearing dimensions (inner diameter, outer diameter, width), and our technical team will verify compatibility with SKF's specifications.
Q: What warranty do you offer on SKF bearings?
A: All SKF bearings come with the original factory warranty covering manufacturing defects. Specific warranty terms are provided with each shipment and can be included in your purchase contract.
Q: What is the minimum order quantity for the SKF 21310EK?
A: We accept orders of any quantity, from single units for maintenance to large bulk orders for production lines, with competitive pricing at all volume levels.
Q: How long does shipping take to [my location]?
A: Standard delivery times are 7-15 days to most countries and regions via our global logistics network. Express options are available for urgent requirements—contact us with your location for a precise timeline.
Q: Can you provide customized packaging or labeling for this bearing?
A: Yes, we offer customized packaging, label printing with your company information, and technical documentation services to meet specific customer requirements.
Ready to order or need a quote?
Send the bearing model, dimensions (d x D x B), and quantity — we'll get back to you with pricing and lead time.
Project buyers
"We submitted a long SKF list for a new project, mixing ball, roller, needle and thrust bearings. This supplier came back with itemized pricing, lead times and alternatives for two long-lead references. We could plan the procurement timeline without surprises."
Daniel KimKim Engineering Project · South Korea"When our project timeline shifted and we needed to split the delivery into three batches, the supplier worked with us on the schedule. Each batch arrived complete and on the agreed date. No holding costs, no rush shipping fees."
Mohammed Al-AminAl-Amin Contracting · Saudi ArabiaSame series
Comparable designations from the same category, ready to add to one itemized quote.
Spherical Roller Bearing Spherical Roller Bearing 22214MBK/W33 70x125x31mm for Wind Power Generation
Spherical Roller Bearing Spherical Roller Bearings 24056CC W33 Self-Aligning for Wind Power Heavy-Duty Machinery
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Spherical Roller Bearing Self-Aligning Roller Bearings 22238EK 22240EK for Wind Power Generation Equipment Where it runs
Typical equipment and duty conditions this SKF bearing type is specified for.
Standard and precision lines listed separately, each with model, stock, lead time and validity — so your comparison is line by line, not guesswork.
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Read the selection guideFAQ
Send the selected SKF model, quantity per line, accuracy requirement, mounting accessories, destination country and postcode, and the date you need the goods. Confirm the exact execution and whether you need the complete assembly. With that, Project Purchasing Company returns a written itemized quote.
List precision bearings on separate lines with their accuracy class and arrangement or configuration. Keeping them apart from standard bearings prevents wrong pricing and wrong shipments on mixed project lists.
Yes. Send a photo of the nameplate or bearing markings, and we list the information that still needs confirming. Any technical change or alternative model is clearly marked and requires your approval.
Yes. Shipping method and delivery schedule are confirmed before dispatch, so batches can follow your installation timeline. On receipt, check labels, quantity and condition; any mismatch is handled with your order number and photos.
Request a quote
Project Purchasing Company quotes every line by SKF model, with price and currency, stock, estimated lead time, validity and freight or tax terms. Add related bearings and accessories to the same request.