Ensure smooth, high-precision rotation in your metallurgy machinery with Self-Aligning Roller Bearings 21304-21309, engineered to minimize downtime and enhance operational stability. Crafted from premium bearing steel with P0-P4 precision grades and C0/C3/C4 clearance options, these double-row radial bearings deliver long life and low noise even under heavy loads—critical for maintaining consistent production in demanding industrial environments.
| 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 |
| 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 |
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.
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.
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.
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.
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.
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.
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.
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.
Ready to order or need a quote?
Send
High-grade chrome steel, raw material QC, full-process monitoring, ISO/ABMA/DIN compliance.
Samples in 3-5 days, bulk orders 5-15 days. Free samples for distributors (freight collect).
P0-P4 precision grades, Z2-Z3-Z4 noise levels. Custom drawings welcome.
Professional technical guidance and failure solutions from our R&D team.
Master Sweden import duty thrust ball bearing costs by understanding that zero percent EU tariffs still incur twenty-five percent VAT. Avoid costly customs delays at Gothenburg port through accurate HS code 8482.50 classification and complete origin documentation to protect your distribution margins.
Read ArticleNavigate the Global Spherical Roller Bearing Market 2026 by addressing the structural divergence between wind energy precision and mining durability needs. Learn how quality control bottlenecks drive lead time volatility and why adopting mixed-brand sourcing strategies is essential for mitigating inventory risks in a fluctuating supply chain.
Read ArticleDiscover how China Deep Groove Ball Bearing Manufacturing Trends 2026 shift focus from price to reliability through advanced anti-corrosion packaging and strict batch consistency. Learn why moisture control and traceable steel sourcing are critical for reducing total cost of ownership in global exports.
Read ArticleOur R&D team supports full OEM/ODM customization with technical drawings. Contact us for stable factory pricing and reliable supply.
