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

Product Specifications

Application Industries

Minimize Downtime with Double Row Cylindrical Roller Bearing NNU4938/4940 B/Sp W33

Industrial operations lose thousands in revenue daily when critical machinery fails due to bearing issues. Sourcing replacement bearings often means coordinating with multiple suppliers, verifying authenticity, and waiting weeks for delivery—compounding production delays. For large industrial machinery, the wrong bearing choice can lead to premature wear, increased energy consumption, and costly secondary damage.

Authorized Quality, Available for Immediate Shipment

As an official distributor of SKF and NTN, we offer the NNU4938 and NNU4940 B/Sp W33 double row cylindrical roller bearings with guaranteed authenticity. These bearings, designed for large industrial machinery, feature 60-64 HRC hardness for exceptional durability. Our unified ISO 9001 quality control system ensures every unit meets strict performance standards, while our sufficient hot-selling stock means we can fulfill urgent orders without long lead times.

Engineered for Heavy-Duty Industrial Environments

The W33 cylindrical roller bearing design excels in applications with high radial loads and moderate axial forces, common in large gearboxes and motor spindles. Its separated inner and outer rings allow for easy mounting and dismounting, simplifying maintenance in tight spaces. With vibration levels graded Z1V1 to Z3V3, these bearings maintain stable operation even at high rotational speeds, reducing noise and extending equipment lifespan in continuous-duty machinery.

Technical Features That Ensure Reliable Performance

The 60-64 HRC hardness of the bearing steel provides optimal wear resistance, critical for withstanding the abrasive conditions of mining and manufacturing equipment. Available clearance grades (C0 to C5) allow precise matching to operating temperatures and load conditions—C3 clearance, for example, accommodates thermal expansion in high-temperature environments like steel mills. Brass and steel cage options offer flexibility: brass cages handle higher speeds and loads, while steel cages provide cost-effective durability for general machinery applications.

Why Authentic Bearings Lower Total Operating Costs

Counterfeit double row cylindrical roller bearings often fail prematurely, causing unplanned downtime and potential damage to shafts or housings. A single bearing failure in a critical machine can cost 10-20 times the bearing's value in lost production. Our bearings, sourced directly from authorized manufacturers, adhere to strict material and dimensional tolerances, ensuring predictable performance and reducing maintenance frequency. The initial investment in genuine bearings translates to lower total cost of ownership over the equipment's lifecycle.

Your Trusted Partner for Industrial Bearing Solutions

Packaging & Shipping

• Secure carton pallet packaging with protective internal padding to prevent damage during transit
• 现货 available for dispatch within 3-7 working days for urgent maintenance needs
• Flexible logistics options including DHL, FedEx, UPS, air freight, and sea freight
• Real-time tracking numbers provided once shipment is confirmed
• Minimum order quantity of 1 unit, supporting both emergency repairs and bulk procurement

Restore Your Machinery's Performance Today

Delayed maintenance only increases the risk of catastrophic failure. Send us your bearing requirements—including model NNU4938 or NNU4940, application details, and quantity—and our team will provide a unified quote within one working day. With our ready stock and global shipping network, we can help you minimize downtime and get your production line back to full capacity quickly.

Frequently Asked Questions