Product Specifications
| Parameter |
Details |
| Model NO. |
21304, 21305, 21306, 21307, 21308, 21309, 21310 |
| Precision Rating |
P0, P6, P5, P4, P2 |
| Clearance |
C0, C3, C4 |
| 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 |
| Origin |
China |
| HS Code |
8482300000 |
Application Industries
| Industry |
Typical Equipment |
| Steel & Metallurgy |
Rolling Mills, Continuous Casters, Furnace Conveyors |
| Mining & Construction |
Crushers, Conveyors, Heavy-Duty Gearboxes |
| Industrial Machinery |
Reducer Systems, Press Machines, Rotary Kilns |
Minimize Downtime with High Precision Self-Aligning Roller Bearings 21304-21309 for Metallurgy Machinery
Metallurgy operations face critical challenges when bearings fail—unplanned shutdowns halt production, repair costs escalate, and missed deadlines impact profitability. Many struggle with bearings that can’t handle heavy radial loads or misalignment in high-temperature environments, leading to frequent replacements. Sourcing reliable, precision-grade bearings with flexible order options often adds another layer of complexity.
Self-Aligning Roller Bearings Engineered for Metallurgy’s Toughest Conditions
Our Self-Aligning Roller Bearings 21304-21309 series addresses these pain points directly. Designed for metallurgy machinery, these high precision P0-P4 bearings deliver long life, high speed, and low noise performance—critical for continuous operation in rolling mills and furnace conveyors. With rich stock availability, we support flexible orders from 1pc MOQ, ensuring you get the exact bearings you need without excessive inventory costs. Backed by our ISO9001 certified quality control, each unit undergoes rigorous testing before shipment.
Optimal Performance in Heavy-Duty Metallurgy Applications
These double-row radial bearings excel in environments with heavy radial loads and potential shaft misalignment—common in metallurgy machinery like continuous casters and rotary kilns. The self-aligning design compensates for angular deviations up to 2-3 degrees, reducing stress on shafts and extending equipment life. Whether operating under high temperatures or variable load conditions, the bearing steel construction ensures durability and consistent performance, minimizing the risk of unexpected failures during critical production cycles.
Precision and Clearance: Technical Factors That Impact Your Operations
Three key parameters define the performance of these self-aligning roller bearings. The precision rating (P0-P4) directly affects rotational accuracy—P4 grade bearings, for instance, maintain tighter tolerances, reducing vibration in high-speed applications like rolling mill drives. Clearance options (C0, C3, C4) accommodate thermal expansion; C3 and C4 clearances are ideal for high-temperature metallurgy processes where heat-induced expansion could otherwise cause binding. The double-row roller design distributes loads evenly, increasing dynamic load capacity and enabling longer service intervals compared to single-row alternatives.
Why Cutting Corners on Bearings Costs More in the Long Run
Choosing low-quality bearings may seem cost-effective initially, but the hidden expenses add up quickly. A single bearing failure in a metallurgy conveyor can halt production for 8+ hours, resulting in thousands of dollars in lost output. Inferior materials lead to premature wear, requiring frequent replacements and maintenance. Our bearings, however, are built to ISO standards and backed by a 12-month global warranty, ensuring reliable performance and reducing total cost of ownership. By investing in high precision self-aligning roller bearings, you protect your equipment, maintain production schedules, and avoid unnecessary downtime.
Your Trusted Partner for Bearing Solutions Since 2005
Jinan Saifan Bearing has served global buyers across Europe, America, and Southeast Asia for over 18 years, building a reputation for stability and quality. Our integrated manufacturing and exporting capabilities mean we control every step of production—from R&D to quality control—supported by an in-house QC lab. We offer full OEM/ODM customization to meet specific metallurgy machinery requirements, with sample lead times of 3–5 days and bulk delivery in 5–15 days. Our technical team provides free guidance on selection and installation, ensuring you get the right bearing for your application. With multiple payment options including T/T, credit card, and Alibaba trade assurance, we make transactions secure and convenient.
Packaging & Shipping
- Carton pallet packaging with protective internal cushioning to prevent damage during transit
- Sample lead time: 3–5 days; bulk delivery: 5–15 days from order confirmation
- Transport options: by Sea or by Air, with major carriers for reliable global delivery
- Real-time shipment tracking provided once order is dispatched
- 1pc MOQ available for standard items, supporting emergency repairs and small-batch requirements
Get Your Metallurgy Machinery Bearings Shipped Fast
Don’t let equipment downtime affect your bottom line. Whether you need a single replacement bearing or bulk order for scheduled maintenance, our ready stock ensures quick dispatch. Send us your bearing model, required precision grade, and quantity today—we’ll provide a competitive quote within 24 hours and get your order on the way.
Frequently Asked Questions
Q: Are these self-aligning roller bearings genuine and traceable?
A: Yes, all our bearings are manufactured in our ISO9001 & ISO14001 certified facility and come with complete production traceability documentation.
Q: How do I confirm the correct bearing model for my metallurgy equipment?
A: Provide your equipment model, load requirements, and operating conditions. Our technical team will verify the optimal bearing specification for your application.
Q: What is the warranty policy for these bearings?
A: We offer 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 the 21304-21309 series?
A: Standard items have a 1pc MOQ, supporting both emergency repairs and small-batch purchases.
Q: How quickly can I receive my order?
A: Samples ship in 3–5 days, while bulk orders are delivered within 5–15 days via sea or air transport, depending on your location.
Q: Can you provide custom clearance or precision grades for specific applications?
A: Yes, we offer full ODM/OEM customization, including precision grades (P0-P4) and clearance options (C0, C3, C4) to meet unique operational requirements.
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