Product Specifications
| Parameter |
Details |
| Model NO. |
21311 |
| Precision Rating |
P0, P6, P5, P4, P2 |
| Clearance |
C0, C3, C4 |
| Feature |
Long Life, High Speed, Low Noise |
| Rolling Body |
Roller Bearings |
| The Number of Rows |
Double |
| Material |
Bearing Steel |
| Spherical |
Aligning Bearings |
| Load Direction |
Radial Bearing |
| Separated |
Unseparated |
| Specification |
55×120×29 mm |
| Origin |
China |
| HS Code |
8482300000 |
Application Industries
| Industry |
Typical Equipment |
| Industrial Machinery |
Machine Tools, Printing Presses, Gearboxes |
| Auto Parts Manufacturing |
Transmission Systems, Drivetrain Components |
| Agricultural Machinery |
Harvesters, Tractors, Heavy-Duty Farming Equipment |
| Construction |
Excavators, Conveyors, Heavy Load Machinery |
| New Energy |
Wind Turbine Gearboxes, Solar Panel Tracking Systems |
Minimize Downtime with 21311E Self-Aligning Roller Bearings Engineered for Reliability
Industrial operations face costly disruptions when bearings fail prematurely—whether due to misalignment, heavy loads, or subpar manufacturing. Replacing failed components not only incurs parts costs but halts production, delays deadlines, and strains maintenance teams. For machinery handling radial loads with potential shaft misalignment, choosing the right self-aligning roller bearing is critical to avoiding these setbacks.
21311E/21311EK Bearings: Ready-to-Ship Solutions for Critical Applications
Our Self-Aligning Roller Bearing 21311E and 21311EK models address these challenges with precision engineering and immediate availability. With rich stock and 5–15 days bulk delivery, we eliminate long lead times that keep your equipment idle. Designed for industrial machinery, these bearings accommodate misalignment up to 2°, ensuring consistent performance in gearboxes, conveyors, and agricultural equipment where shaft deflection is common.
Engineered for Heavy Loads and Continuous Operation
This self-aligning roller bearing excels in applications with high radial loads and moderate axial loads, such as machine tool spindles and printing presses. Its double-row roller design distributes weight evenly, while the spherical outer ring allows for dynamic self-alignment—critical in equipment subject to thermal expansion or mounting errors. The 55x120x29mm dimension ensures compatibility with standard industrial shafts, making it a versatile choice for retrofits and new builds.
Technical Precision That Drives Performance
The 21311EK bearing’s performance is defined by key technical attributes: precision ratings from P0 to P4 ensure minimal runout and vibration, reducing noise in high-speed applications like electric motors. Clearance options (C0, C3, C4) allow customization for operating conditions—C3/C4 clearances accommodate thermal expansion in high-temperature environments, while C0 suits standard duty cycles. Crafted from high-grade bearing steel, it delivers long life even under continuous load, supported by our ISO9001-certified quality control processes.
Why Authentic Bearings Reduce Total Cost of Ownership
Opting for genuine self-aligning roller bearings avoids the hidden costs of counterfeits. Substandard bearings often fail within months, leading to repeated replacements, unplanned downtime, and potential damage to adjacent components. Our bearings, backed by a 12-month global warranty, ensure predictable performance and reduce maintenance frequency. For example, a single bearing failure in a production line can cost $10,000+ in lost output—investing in reliable components minimizes this risk.
Your Trusted Partner for Bearing Solutions
With 18 years in bearing manufacturing and exports to Europe, America, and Southeast Asia, Jinan Saifan Bearing combines expertise with accountability. Our full R&D lab and QC processes ensure each 21311E bearing meets strict tolerance standards. We offer OEM/ODM customization to match your unique requirements, backed by free technical guidance. Whether you need 1pc for emergency repairs or bulk orders, our flexible MOQ and secure payment options (T/T, credit card, Alibaba trade) simplify procurement.
Packaging & Shipping
- Carton and pallet packaging for secure transport
- 3–5 days sample lead time for testing and validation
- Multiple transport options: by sea or by air to match urgency
- 1pc MOQ available for emergency replacement needs
- Free samples provided (buyer covers freight)
Secure Your Bearing Supply Today
Don’t let bearing issues disrupt your operations. The 21311E Self-Aligning Roller Bearing is in stock and ready to ship—order now to minimize downtime. Provide your application details, and our team will confirm compatibility and deliver a quote within 24 hours.
Frequently Asked Questions
Q: Are these bearings authentic and traceable?
A: Yes, all our bearings are manufactured in-house under ISO9001/ISO14001 certifications, with full traceability from raw materials to production batch.
Q: How do I confirm if the 21311EK is compatible with my equipment?
A: Share your equipment model, load requirements, and operating conditions—our technical team provides free选型 support to ensure proper fit.
Q: What is your warranty policy?
A: We offer a 12-month global warranty covering manufacturing defects, with free replacement or refund for non-conforming products.
Q: What is the minimum order quantity?
A: Standard items have a 1pc MOQ, ideal for emergency repairs or small-batch needs.
Q: How long does shipping take?
A: Samples ship in 3–5 days; bulk orders deliver in 5–15 days via sea or air freight.
Q: How can I verify bearing quality upon receipt?
A: Each bearing includes batch test reports; our QC lab can provide additional material and dimensional analysis upon request.
Ready to order or need a quote?
Send your bearing designation, application details, and quantity — we’ll respond within 24 hours.
