Product Specifications
| Parameter |
Details |
| Model NO. |
21311, 21312, 21313, 21314, 21315 |
| 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 |
100*180*46 mm |
| HS Code |
8482300000 |
Application Industries
| Industry |
Typical Equipment |
| Steel & Metallurgy |
Rolling Mills, Continuous Casters |
| Industrial Machinery |
Reduction Gearboxes, Heavy-Duty Conveyors |
| Mining & Construction |
Crushers, Vibrating Screens |
| Paper & Printing |
Calendering Machines, Reel Stands |
Minimize Downtime with 21311-21315 Self-Aligning Roller Bearings for Rolling Mills
Rolling mill operations face constant challenges from bearing failures—unplanned shutdowns cut production, increase maintenance costs, and disrupt delivery schedules. Many manufacturers struggle with bearings that can’t handle heavy radial loads or misalignment, leading to premature wear. Sourcing reliable precision bearings with flexible order options often means choosing between quality, cost, and lead time.
Self-Aligning Roller Bearings Engineered for Rolling Mill Durability
Our Self-Aligning Roller Bearing 21311-21315 series addresses these pain points with P0-P4 precision ratings and long-life performance specifically designed for rolling mill applications. With rich stock availability, we support both emergency repairs and scheduled maintenance, eliminating the need for large inventory holdings. The double-row roller design accommodates radial loads up to 500 kN while allowing angular misalignment up to 2°, reducing installation stress and extending service life.
Optimal Performance in Heavy-Duty Rolling Mill Conditions
These bearings excel in the harsh environments of hot rolling mills, where high temperatures, heavy shock loads, and continuous operation are the norm. The bearing steel construction ensures resistance to wear under extreme pressure, while the low-noise feature minimizes operational sound in industrial settings. Whether used in backup rolls, work rolls, or gearbox applications, the self-aligning capability compensates for shaft deflection, ensuring consistent performance even in misaligned setups.
Technical Advantages That Maximize Operational Efficiency
The precision rating directly impacts performance: P4 class bearings reduce runout by 50% compared to P0, critical for maintaining roll parallelism and product quality. Clearance options (C0, C3, C4) allow customization—C3 clearance is ideal for high-temperature applications where thermal expansion occurs, preventing seizure. The unseparated design simplifies installation and replacement, reducing maintenance time. Dynamic load ratings (C) for the 21315 model reach 320 kN, ensuring reliable operation under peak rolling forces.
Why Genuine Bearings Lower Total Cost of Ownership
Choosing authentic self-aligning roller bearings over counterfeits eliminates hidden costs: a single bearing failure in a rolling mill can cause $10,000+ in downtime per hour. Our bearings, backed by ISO9001 certification, undergo strict quality control—each unit is tested for dimensional accuracy and noise levels before shipment. The 12-month global warranty covers manufacturing defects, providing financial protection that cheap alternatives can’t match. Over time, the extended service life of genuine bearings reduces replacement frequency and labor costs.
Your Trusted Partner for Bearing Supply and Support
With 18 years of experience serving global buyers, Jinan Saifan Bearing combines manufacturing expertise with responsive service. Our QC lab conducts 16-point inspections on all bearings, from raw material hardness to final assembly. We offer OEM/ODM customization to meet specific rolling mill requirements, supported by a technical team available for installation guidance. As an integrated manufacturer, we maintain stable supply chains even during raw material price fluctuations, ensuring consistent delivery within 5–15 days for bulk orders.
Packaging & Shipping
- Carton pallet packaging with moisture barrier protection
- 3–5 days sample lead time for urgent testing
- Shipping by sea or air with door-to-door logistics options
- Real-time tracking provided for all shipments
- 1pc MOQ available for emergency replacement needs
Secure Your Rolling Mill’s Reliability Today
Don’t let bearing issues disrupt your production schedule. Send us your required model (21311-21315), precision class, and quantity, and our team will provide a detailed quote within 24 hours. With stock on hand, we can ship standard bearings within 3 days—minimizing your downtime and keeping your rolling mill operational.
Frequently Asked Questions
Q: Are these bearings genuine and traceable?
A: Yes, all our self-aligning roller bearings are manufactured in our ISO9001-certified facility and come with batch traceability documentation for quality assurance.
Q: How do I select the right clearance for my rolling mill application?
A: Our technical team can recommend clearance based on your operating temperature and load conditions. C3 is typically used for high-temperature rolling mill environments.
Q: What warranty coverage do you offer?
A: We provide a 12-month global warranty covering manufacturing defects, with free replacement or refund available for non-conforming products.
Q: What is the minimum order quantity for standard bearings?
A: We accept 1pc MOQ for standard models like 21311-21315, supporting emergency repair needs.
Q: How quickly can you ship after order confirmation?
A: Stock items ship within 3–5 days; bulk orders typically deliver within 5–15 days depending on quantity.
Q: Do you provide technical support for installation?
A: Yes, our engineering team offers free technical guidance on bearing installation, mounting, and maintenance best practices.
Ready to order or need a quote?
Send your bearing designation, application details, and quantity — we’ll respond within 24 hours.
