NJ215EM Cylindrical Roller Bearing 75x130x25 High Load Roller Bearings For Machinery

The NJ215EM cylindrical roller bearing is a crucial component in industrial machinery, ensuring smooth power transmission and stable operation of various equipment. As a single-row cylindrical roller bearing, it features an inner diameter of 75mm, outer diameter of 130mm, and width of 25mm. This size combination provides optimal balance between compactness and substantial load-bearing capabilities, making it highly adaptable to mechanical applications requiring reliable performance under diverse operating conditions.

• Rolling Elements: High-precision cylindrical rollers crafted from top-grade high-carbon chromium bearing steel with extremely low surface roughness and tight micrometer-level dimensional accuracy. The line-contact design increases contact area for uniform load distribution, enhancing radial load capacity and extending service life.
• Raceways: Inner and outer ring raceways processed using super-finishing grinding techniques with surface hardness up to HRC60-65, providing excellent wear-resistance and fatigue-resistance. Precise geometric parameters ensure smooth roller movement with minimal friction coefficient.
• Cage: Integral metal-machined cage made from high-strength alloy steel with special heat treatment for enhanced rigidity and toughness. High pocket size accuracy guides and separates cylindrical rollers, preventing collisions and improving overall stability.
• Rib Structure: Outer ring with double ribs and inner ring with single rib provides axial load-carrying capacity, withstands one-way axial forces, and performs axial positioning function for shaft or housing.

• High Radial Load Capacity: Line-contact design enables remarkable radial load-carrying capacity, suitable for heavy-duty machinery including industrial motors, precision machine tools, and heavy-load transmission devices.
• Good Axial Load Performance: Unique rib structure allows bearing to withstand certain one-way axial loads while providing reliable axial positioning for equipment operating under complex stress environments.
• High-Speed Rotation Stability: Precision processing and optimized structural design maintain stable performance at high rotational speeds with low friction characteristics and reduced heat generation and vibration.
• Excellent Fatigue Resistance: High-quality materials and advanced manufacturing processes provide excellent fatigue resistance under long-term full-load operation, extending service life and reducing maintenance frequency.

• Industrial Machinery: Extensive use in transmission systems of automated production lines, providing stable support for high-speed and high-load rotating shafts in manufacturing plants.
• Power Generation Equipment: Suitable for rotor support systems in generators and turbines, handling large radial loads and axial forces under high-speed, high-load conditions.
• Machine Tool Industry: Used for spindle and feed shaft support in precision machine tools, providing low-vibration and high-rigidity characteristics to ensure dimensional accuracy and surface quality of machined workpieces.
• Transportation Equipment: Vital role in axle support systems of heavy-duty trucks and construction machinery, withstanding harsh conditions, large loads, and vibrations.

• Lubrication Management: Proper lubrication with appropriate grease or oil based on operating conditions. Ensure bearing interior and installation area are clean, with grease filling typically 1/3 to 1/2 of bearing internal space. Regular inspections and timely replenishment are essential.
• Regular Inspection: Comprehensive inspection system using visual checks and monitoring tools like vibration sensors and temperature monitors. Working temperature should not exceed 40°C above ambient temperature. Immediate shutdown required for abnormal increases in vibration or temperature.
• Installation Specifications: Clean installation environment with specialized tools to prevent damage. Avoid direct hammering on bearing rings. Ensure proper fit with shaft and bearing housing, controlling interference fit within specified range.
• Storage Precautions: Store in dry, well-ventilated area free from corrosive gases, away from heat sources and high humidity. Place horizontally to avoid deformation, and wrap in anti-rust paper or plastic film. Regular storage checks recommended.