Wholesale NUP Series Cylindrical Roller Bearings

NUP Series Cylindrical Roller Bearings – Precision Radial Load Solutions

As a Wholesale NUP Series Cylindrical Roller Bearings manufacturer and supplier, Shanghai Yinin Bearing & Transmission Company provides a comprehensive range of NUP bearings engineered for high radial loads and axial location in demanding industrial applications. Our NUP series combines robust cylindrical roller design with a loose rib for axial displacement, making it ideal for machine tool spindles, electric motors, gearboxes, and heavy machinery.

With over two decades in the bearing industry, we have evolved from representing Chinese bearing manufacturers to operating our own production facilities, including Jiangsu Dahua Bearing Manufacturing Co., Ltd. Our integrated approach ensures quality control from raw material to finished product, supporting OEM and aftermarket projects worldwide.

Our NUP Series Range

We supply five main NUP series groups, each tailored to specific bore sizes and load requirements. All are manufactured in chrome steel (GCr15) or stainless steel (AISI 440C) per your application needs.

Design and Engineering Value

NUP bearings feature a single inner ring rib and a loose rib on the opposite side, allowing axial displacement of the shaft relative to the housing while supporting radial loads. This design provides:

• High radial load capacity – line contact between rollers and raceways distributes stress evenly.
• Axial location capability – the loose rib can guide axial forces in one direction when mounted correctly.
• Low friction – optimized roller profile reduces heat generation at high speeds.
• Interchangeability – standard dimensions match ISO and DIN tolerances.

We apply advanced heat treatment and precision grinding to achieve consistent hardness and dimensional accuracy. Each bearing is inspected for radial clearance, runout, and surface finish to meet P0, P6, or P5 precision classes as required.

Application Fit and Selection

Our NUP series is suitable for applications where the shaft needs to expand or contract due to temperature changes, such as long drive shafts or motors with significant thermal growth. Common industries include:

For applications requiring pure radial support without axial location, consider our NU Series. For applications needing axial location on both sides, our NJ Series may be more suitable. Our team can help you select the correct series based on your load, speed, and mounting configuration.

Quality Assurance and Testing

Quality is built into every stage of production. We conduct inspections after each manufacturing process, including:

• Raw material verification – spectrographic analysis of steel composition.
• Dimensional inspection – using precision instruments to verify bore, OD, width, and raceway geometry.
• Noise and vibration testing – each bearing is checked for smoothness and acoustic performance.
• Final visual inspection – ensuring no surface defects or contamination.

We can provide inspection reports and certificates of conformity upon request. Our testing procedures align with international standards such as ISO 492 and GB/T 307.1.

Customization and Configuration

We understand that standard catalogs may not cover every requirement. We offer customization in:

• Materials – chrome steel, stainless steel, or case-hardened steel for special environments.
• Cages – steel, brass, or polyamide depending on speed and temperature.
• Precision class – P0, P6, P5, or P4 to match your application tolerance.
• Radial clearance – C2, CN, C3, or C4 for different interference fits.
• Non-standard sizes – we can produce bearings to your specific dimensions.

Our engineering team works with you to define the exact specifications, ensuring the bearing fits your housing and shaft correctly.

Information We Use to Configure Your Solution

To prepare an accurate quotation and technical proposal, please provide the following details:

Send us your drawings or application details, and our technical team will respond within 12 working hours with a tailored solution.

Packaging and Delivery

We package bearings individually in rust-proof paper, then in cartons or wooden crates for export. Standard bearings are shipped within 3 working days if in stock. For customized orders, lead time depends on complexity and quantity. We coordinate logistics to ensure safe and timely delivery to your port or warehouse.

Frequently Asked Questions

What is the difference between NUP and NU cylindrical roller bearings?

NU bearings have no ribs on the inner ring, allowing free axial displacement in both directions. NUP bearings have a loose rib on the inner ring, which can locate the shaft axially in one direction while still permitting some axial movement. Choose NUP when you need axial location without a separate thrust bearing.

Can you supply NUP bearings in stainless steel?

Yes, we offer NUP series in AISI 440C stainless steel for corrosive environments. Stainless steel bearings have lower load ratings than chrome steel but provide excellent resistance to moisture and chemicals.

What precision grades are available for NUP series?

We manufacture NUP bearings in P0 (standard), P6, P5, and P4 precision classes. Higher precision grades are suitable for machine tool spindles and high-speed applications where runout and dimensional accuracy are critical.

Do you provide samples for testing?

Yes, we can provide samples for evaluation. Sample cost and delivery time depend on the bearing size and specifications. Contact us with your requirements to arrange sample testing.

How do you ensure quality consistency for large orders?

We implement strict process control and 100% inspection on critical dimensions. For bulk orders, we follow AQL sampling plans and provide batch inspection reports. Our QC team monitors each production stage to maintain consistency.