Double Row Cylindrical Roller Bearing NNU4938/4940 B/Sp W33 with 60-64 HRC Hardness for Large Industrial Machinery

Product Specifications

Application Industries

Avoid Costly Downtime with NNU4938/4940 B/Sp W33 Double Row Cylindrical Roller Bearings

Industrial machinery operators know the frustration of unexpected downtime—especially when caused by bearing failure. Replacing critical components often means coordinating with multiple suppliers, facing long lead times for specialized parts, and dealing with inconsistent quality across different brands. When your large industrial machinery grinds to a halt, every hour of downtime eats into production targets and profitability.

Precision Bearings Engineered for Heavy-Duty Performance

Our Double Row Cylindrical Roller Bearing NNU4938/4940 B/Sp W33 addresses these challenges directly. As an official authorized distributor for premium European bearings, we maintain sufficient stock of high-precision P4/P2 grade bearings, ensuring you get the right part when you need it. The 60-64 HRC hardness rating guarantees durability even in high-load applications, making these bearings ideal for large industrial machinery such as CNC machine tools, wind turbine gearboxes, and heavy-duty manufacturing equipment.

Optimal Performance in Demanding Industrial Environments

Designed as non-aligning, separated cylindrical roller bearings, this series excels in applications requiring high radial load capacity and precise axial guidance. The separated inner and outer rings allow for easy mounting and dismounting, simplifying maintenance procedures. Whether operating under continuous heavy loads in steel mills or handling dynamic forces in mining equipment, these bearings maintain stability and performance, reducing the risk of unplanned shutdowns.

Technical Features That Ensure Reliability

The technical specifications of these bearings directly contribute to their superior performance. The 60-64 HRC hardness of the bearing steel provides excellent wear resistance, extending service life in abrasive environments. Available clearance grades (C0, C2, C3, C4, C5) allow customization to specific operating conditions—tighter clearances for precision machinery or larger clearances for thermal expansion in high-temperature applications. The brass or steel cage options offer durability and stability, ensuring proper roller guidance even at high speeds, while vibration levels (Z1V1, Z2V2, Z3V3) are controlled to minimize noise and energy loss in industrial settings.

Why Genuine Bearings Matter for Total Cost of Ownership

Choosing genuine high-precision cylindrical roller bearings over counterfeit alternatives eliminates hidden costs associated with premature failure. Counterfeit bearings often lack proper material heat treatment, resulting in inconsistent hardness and reduced load capacity—leading to frequent replacements, unplanned downtime, and potential damage to adjacent machinery. In contrast, our bearings comply with ISO 9001 and DIN standards, backed by rigorous precision testing procedures that ensure each unit meets exacting quality requirements. The long-term reliability of genuine bearings lowers total ownership costs by reducing maintenance frequency and extending equipment lifespan.

Your Trusted Partner for Industrial Bearing Solutions

Packaging & Shipping

• Carton pallet packaging for secure transportation
• Support for priority delivery of urgent components
• Centralized shipment with full logistics tracking
• Flexible shipping options to meet your timeline requirements
• Minimum order quantity of 1 piece, ideal for emergency maintenance

Get Your Bearings Delivered When You Need Them

Don’t let bearing issues slow down your operations. Send us your specific requirements—bearing designation, application details, and quantity—and our team will provide a unified quotation within one working day. With our sufficient stock and premium shockproof logistics, we ensure timely delivery to minimize your machinery downtime.

Frequently Asked Questions