Double Row Cylindrical Roller Bearing NNU4944 B/Sp C3 W33 for CNC Machine Tools

Product Specifications

Application Industries

Minimize CNC Downtime with Precision NNU4944 B/Sp C3 W33 Double Row Cylindrical Roller Bearings

CNC machine operators know the cost of unexpected spindle failure—unplanned downtime averaging $500-$2,000 per hour, missed production deadlines, and cascading delays across manufacturing schedules. When replacement bearings arrive with inconsistent quality or incorrect clearances, the cycle repeats. Sourcing reliable double row cylindrical roller bearings for high-precision applications often means coordinating with multiple suppliers, each with their own lead times and quality standards.

Authentic NNU4944 Bearings in Stock for Immediate Deployment

Our NNU4944 B/Sp C3 W33 double row cylindrical roller bearing is engineered to address these challenges. As an officially authorized distributor, we maintain sufficient ready stock of P4/P2 precision grade bearings, ensuring this critical component for CNC machine tool spindles is available for rapid delivery. The separated design allows for easy installation and maintenance, while the C3 clearance rating provides optimal performance in high-speed rotational applications—exactly what modern CNC equipment demands.

Engineered for CNC Machine Tool Spindle Performance

This double row cylindrical roller bearing excels in the rigorous conditions of CNC machine tool spindles, where it must withstand combined radial and axial loads at high rotational speeds. The W33 designation indicates a lubrication groove and three lubrication holes in the outer ring, ensuring consistent grease distribution even during extended operation. With a hardness of 60-64 HRC, the bearing maintains dimensional stability under thermal stress, a critical factor in maintaining machining accuracy.

Technical Features That Ensure Machining Precision

The NNU4944 B/Sp C3 W33 incorporates key technical attributes that directly impact CNC machine performance. The B/Sp precision class denotes strict tolerances for radial runout and axial clearance, essential for achieving sub-micron machining accuracy. The brass or steel cage options provide distinct advantages: brass cages offer superior heat conductivity for continuous operation, while steel cages deliver enhanced durability in heavy shock-loading scenarios. Vibration classes up to Z3V3 minimize operational noise and resonance, protecting sensitive cutting tools from premature wear.

Why Genuine Bearings Reduce Total Cost of Ownership

Counterfeit cylindrical roller bearings may offer lower upfront costs, but they typically fail within 30-50% of the service life of genuine components. A single spindle failure due to substandard bearings can cost thousands in replacement parts, labor, and lost production. Our bearings adhere to ISO 9001 and DIN standards, with full-process quality traceability from material verification to finished product delivery. The C3 clearance is precisely controlled during manufacturing, preventing premature wear from insufficient lubrication or excessive preload—common issues with improperly spec'd bearings.

Your Trusted Partner for Precision Bearing Solutions

Packaging & Shipping

• Protective carton packaging with pallet reinforcement for shock and dust protection during transit
• Ready stock items shipped within 3-7 business days of order confirmation
• Global logistics options including DHL, FedEx, UPS, air freight, and sea freight
• Real-time shipment tracking provided for all orders
• Minimum order quantity of 1 unit, supporting both emergency repairs and scheduled maintenance

Get Your CNC Spindle Back to Work

Every hour your CNC machine is down impacts your production schedule and bottom line. Our NNU4944 B/Sp C3 W33 double row cylindrical roller bearing is in stock and ready to ship—no minimum order, no extended lead times. Send us your machine model and operating parameters, and our engineering team will confirm compatibility before you order.

Frequently Asked Questions