SKF Bearings
Double Row Cylindrical Roller Bearing NNU4938 NNU4940 for Industrial Machinery with Brass Cage
<p>Ensure smooth, high-precision operation for your industrial machinery with our <strong>Double Row Cylindrical Roller Bearing</strong> NNU4938 and NNU4940, engineered to deliver reliable performance under heavy loads. The brass cage design reduces friction and heat buildup, extending service life while maintaining consistent rotation—ideal for machine tools, reducers, and high-torque equipment.</p><ul><li>Medium to large outer dimensions (120-190mm) with C0-C5 clearance options for precise fit in industrial applications</li><li>60-64 HRC hardness and Z1V1-Z3V3 vibration grades ensure stability even in continuous operation</li><li>Separated structure allows easy maintenance, minimizing downtime for your production line</li></ul>
Precision
P0 – P4
Noise Grade
Z2 / Z3 / Z4
Min. Order
1 Piece
Sample 3–5 Days
12-Month Warranty
OEM / ODM Support
Free Sample Available
Product Description
Product Specifications
| Parameter | Details |
|---|---|
| Model NO. | Double Row Cylindrical Roller Bearing |
| Outer Dimension | Medium and Large(120-190mm) |
| Material | Bearing Steel |
| Spherical | Non-Aligning Bearings |
| Load Direction | Axial Bearing |
| Separated | Separated |
| Clearance | C0 C2 C3 C4 C5 |
| Cage | Brass, Steel |
| Vibration | Z1V1 Z2V2 Z3V3 |
| Hardness | 60-64 HRC |
| Transport Package | Carton Pallet |
| Specification | As Your Request |
| Origin | Jiangsu China |
| HS Code | 8482800000 |
Application Industries
| Industry | Typical Equipment |
|---|---|
| Industrial Machinery | Machine Tools, Gearboxes, Reducers, Printing Machines |
| Automotive | Transmission Systems, Drive Axles |
| Agricultural Machinery | Tractors, Harvesters |
| New Energy | Wind Turbines, Solar Equipment |
Reduce Downtime with Reliable Double Row Cylindrical Roller Bearings NNU4938 NNU4940 for Industrial Machinery
Industrial machinery operators know the frustration of unexpected downtime caused by bearing failures. When a critical bearing like the double row cylindrical roller bearing fails prematurely, production lines stop, maintenance costs rise, and deadlines are missed. Sourcing high-quality bearings with the right specifications can be challenging, especially when balancing price, delivery time, and performance.
High-Quality Double Row Cylindrical Roller Bearings for Industrial Machinery
Our Double Row Cylindrical Roller Bearing NNU4938 and NNU4940 with Brass Cage are designed to address these challenges. As a professional bearing manufacturer with over 15 years of experience, we ensure these bearings meet strict quality standards. The separated design allows for easy installation and maintenance, while the brass cage provides excellent durability and heat resistance, making them ideal for industrial machinery applications such as gearboxes and printing machines.
Optimal Performance in Demanding Industrial Conditions
These double row cylindrical roller bearings excel in high-load, high-speed industrial environments. With a hardness of 60-64 HRC, they offer superior wear resistance, ensuring long service life even under heavy operating conditions. The non-aligning design provides stability in applications where shaft misalignment is minimal, while the axial load capacity makes them suitable for machinery requiring precision and reliability, such as CNC machines and reducers.
Key Technical Features for Enhanced Machinery Performance
The technical specifications of these bearings directly impact industrial machinery performance. The clearance options (C0, C2, C3, C4, C5) allow customization based on operating conditions – tighter clearances for precision applications and larger clearances for high-temperature environments. The vibration grades (Z1V1, Z2V2, Z3V3) ensure smooth operation, reducing noise and improving overall machinery efficiency. The brass cage material enhances heat dissipation, critical for maintaining performance in continuous operation scenarios.
Long-Term Value of Choosing Quality Bearings
Investing in high-quality double row cylindrical roller bearings reduces the total cost of ownership. Inferior bearings may have lower upfront costs but often fail prematurely, leading to unplanned downtime, increased maintenance expenses, and potential damage to other machinery components. Our bearings meet ISO international industrial standards, ensuring consistent performance and reliability. With a focus on using premium bearing steel and advanced manufacturing processes, we deliver bearings that outlast and outperform cheaper alternatives.
Why Industrial Buyers Choose Saifan Bearings
Our commitment to quality and customer service sets us apart. We hold ISO 9001:2015 and ISO 14001 certifications, ensuring strict quality control from raw material inspection to finished product testing. Our professional technical team provides free guidance on bearing selection, installation, and maintenance, helping you optimize bearing performance. With flexible order policies, including a 1-piece MOQ for standard bearings and sample orders without MOQ, we cater to both small and large-scale industrial needs. We serve customers in Europe, North America, Southeast Asia, and the Middle East, offering efficient delivery with sample orders shipped in 3-5 working days and bulk orders in 5-15 working days.
Packaging & Shipping
- Carton pallet packaging for secure transportation
- 3-5 working days for sample orders, 5-15 working days for bulk orders
- Multiple logistics options including international couriers and freight services
- Real-time logistics tracking provided for all shipments
- 1 piece MOQ for standard bearings, customized order quantity negotiable
Get Your Industrial Machinery Bearings Today
Don’t let bearing issues disrupt your production. Whether you need NNU4938 or NNU4940 double row cylindrical roller bearings, we have the expertise and inventory to meet your requirements. Send us your bearing specifications, application details, and quantity, and our team will provide a prompt quote to help you get back to smooth operation.
Frequently Asked Questions
Q: Are these bearings genuine and of high quality?
A: Yes, we are a professional bearing manufacturer with strict quality control processes. All products meet ISO international industrial standards and are certified with ISO 9001:2015 Quality Management System.
Q: How can I confirm if the NNU4938/NNU4940 bearing is suitable for my equipment?
A: Our professional technical team can assist with bearing selection. Provide your equipment model, operating conditions (load, speed, temperature), and we will recommend the appropriate bearing specifications.
Q: What is the warranty policy for these bearings?
A: We offer an official 12-month warranty valid from the date customers receive goods. Qualified defective products can be replaced free of charge or refunded.
Q: What is the minimum order quantity for NNU4938 and NNU4940 bearings?
A: We have a flexible order rule with a 1 piece MOQ for standard bearings. Sample orders are available without MOQ, and customized order quantities are negotiable.
Q: How long does it take to ship the bearings?
A: Sample orders are shipped within 3-5 working days, and bulk orders take 5-15 working days. We offer multiple shipping methods to meet your delivery requirements.
Q: How can I ensure the bearings I receive are not counterfeit?
A: We provide complete product traceability and quality documentation. Our bearings are manufactured in our own factory with strict quality control, and we can provide certification of compliance with international standards upon request.
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Double Row Cylindrical Roller Bearing NNU4938 NNU4940 for Industrial Machinery with Brass Cage?
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Phone / WhatsApp
+86 156 6666 3558Address
2612 Ming Quan, Chun Xiao No.88 Dikou Rd,
TianQiao Dist, Jinan, Shandong, China
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