Wholesale NJ Series Cylindrical Roller Bearings

NJ Series Cylindrical Roller Bearings from Shanghai Yinin

Shanghai Yinin Bearing & Transmission Company is a China-based wholesale NJ Series cylindrical roller bearings manufacturer and supplier. Since 1999, we have evolved from an export agent for domestic bearing brands into an integrated enterprise with our own manufacturing facility, Jiangsu Dahua Bearing Manufacturing Co., Ltd. Today, we combine bearing design, production, sales, and service under one roof, with about 80 employees and 12 technical staff dedicated to producing reliable radial bearings for demanding industrial applications.

Our NJ series range includes NJ1000, NJ200, NJ2200, NJ300, and NJ2300 series, each engineered for high radial load capacity and high-speed operation. These single-row cylindrical roller bearings feature rollers guided by ribs on the inner ring, allowing them to accommodate axial displacement of the shaft in one direction. This design makes them suitable for machine tool spindles, electric motors, gearboxes, pumps, and other rotating equipment where rigidity and precision are critical.

As a Wholesale NJ Series Cylindrical Roller Bearings manufacturer, we supply both standard and customized solutions. Our factory in Jiangsu Province is equipped with modern manufacturing equipment and precision measuring tools, ensuring each bearing meets international quality standards. We perform inspections after every process and conduct full inspections on finished products according to customer requirements and international standards.

Available NJ Series Range

We offer five NJ series sub-families to cover a wide spectrum of bore sizes and load ratings. Each series is designed for specific shaft diameters and application demands, from compact machinery to heavy industrial equipment.

All series are available in chrome steel (GCR15) or stainless steel, depending on your operating environment. We can also supply bearings with different cage materials—steel, brass, or polyamide—to match speed and temperature requirements.

Application Fit and Engineering Considerations

NJ series bearings are designed for applications where the shaft must be able to move axially relative to the housing. This makes them ideal for non-locating bearing positions in machines with multiple bearings, such as electric motors and gearboxes. The inner ring has two integral ribs, while the outer ring has none, allowing axial displacement of the shaft in one direction.

When selecting an NJ bearing, we evaluate the following factors with you:

• Radial load magnitude – NJ bearings handle heavy radial loads but limited axial loads (only one direction).
• Speed requirements – Cylindrical rollers provide low friction, enabling high-speed operation.
• Shaft and housing fit – Proper interference fits prevent creep and ensure load distribution.
• Operating temperature – Affects lubricant selection and internal clearance.
• Lubrication method – Grease or oil, depending on speed and heat dissipation.

Our engineering team can help you determine the correct bearing size, internal clearance (C2, CN, C3, C4), and cage type based on your specific operating conditions.

Quality Assurance and Testing

Quality is the foundation of our manufacturing process. We operate a dedicated QC center at our Jiangsu factory, where each batch undergoes dimensional inspection, material verification, and performance testing. Our testing equipment includes precision measuring instruments for bore, outer diameter, width, and radial runout, as well as noise and vibration analyzers.

We follow international standards such as ISO 492 for dimensional tolerances and ISO 199 for radial runout. For finished bearings, we conduct full inspections according to customer requirements, including visual inspection, rotational smoothness, and noise testing. This ensures that every bearing we ship meets the specified accuracy class—typically P0, P6, or P5—depending on your application.

Configuration and Customization

While we offer standard NJ series bearings, we also support customization for non-standard applications. Our capabilities include:

• Modified internal clearance for specific fits or temperature ranges
• Special cage materials or designs for high-speed or high-temperature use
• Stainless steel variants for corrosive environments
• Bearings with seals or shields (though NJ series typically open)
• Non-standard bore or outer diameter dimensions for unique housings

We also offer matched sets or paired bearings when your application requires preload or specific axial clearance. Our technicians work with you to define the exact specifications and provide samples for validation before mass production.

Information We Use to Configure Your Solution

To prepare an accurate quotation and technical proposal, we need the following details from your side:

• Bearing series and bore diameter (e.g., NJ2206)
• Required quantity and target delivery schedule
• Operating speed, radial and axial loads, and expected life
• Shaft and housing dimensions, fits, and tolerances
• Lubrication type and operating temperature range
• Any special requirements: material, cage, clearance, accuracy class, or packaging

With this information, we can recommend the most suitable bearing configuration and provide a detailed quotation, including technical drawings and test reports if needed.

Frequently Asked Questions

What is the difference between NJ and NU series bearings?

NJ bearings have two integral ribs on the inner ring and one on the outer ring, allowing axial displacement in one direction. NU bearings have no ribs on the inner ring, permitting axial displacement in both directions. Choose NJ for locating one side of the shaft, and NU for non-locating positions.

Can you supply stainless steel NJ series bearings?

Yes, we can manufacture NJ series bearings in stainless steel (AISI 440C or equivalent) for applications requiring corrosion resistance, such as food processing or chemical equipment. Please specify the material grade and operating environment when requesting a quote.

What is the minimum order quantity for NJ series bearings?

Our standard MOQ is 100 sets for stocked sizes, but we can accommodate smaller trial orders for evaluation. For customized bearings, the MOQ depends on the complexity and manufacturing process.

How do you ensure the quality of bearings before shipment?

We perform inspections at each manufacturing stage and conduct final inspection on finished bearings according to international standards. We can provide inspection reports and, if required, third-party testing certificates.

What is your typical lead time for NJ series bearings?

For in-stock items, we ship within 3 working days. For production orders, lead time varies based on quantity and customization, typically 2-4 weeks. We will confirm exact delivery dates in our quotation.