Ball Bearings
Angular Contact Ball Bearings
The NU/NJ/NUP/N/NF/NP cylindrical roller bearings are engineered for high radial load capacity, low friction, and long-term operational reliability. With a compact structure and high rigidity, this bearing series maintains excellent running accuracy under high-speed or heavy-load conditions. By optimizing roller and raceway geometry and applying high-precision manufacturing processes, these bearings deliver higher efficiency, extended service life, and reduced maintenance requirements in industrial transmission systems.
Key Features
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High Radial Load Capacity
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Low Friction and High Operating Efficiency
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High Rigidity and Precision Performance
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Multiple Structural Types (NU / NJ / NUP / N / NF / NP)
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Long Service Life and Reduced Maintenance
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Wide Size Range and Customization Support
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Description
Reviews
7000 Series – Single Row Angular Contact Ball Bearing
Most Popular Customizable
7000 series is the most widely used single-row angular contact ball bearing, offering excellent balance of load capacity, speed, and compact design with a standard 40° contact angle for combined radial and axial loads.
- Inner Diameter (d): 10–130 mm
- Outer Diameter (D): 26–200 mm
- Width (B): 8–33 mm
- Basic Dynamic Load Rating (Cr): 5,100–95,000 N
- Basic Static Load Rating (C₀r): 2,550–71,000 N
- Limiting Speed (Grease): 8,000–28,000 rpm
7200 Series – Light Angular Contact Ball Bearing
Higher Load Capacity Customizable
7200 series features a larger ball complement than the 7000 series, providing higher radial and axial load capacity while maintaining a compact cross-section with 40° contact angle.
- Inner Diameter (d): 10–130 mm
- Outer Diameter (D): 30–230 mm
- Width (B): 9–40 mm
- Basic Dynamic Load Rating (Cr): 7,020–143,000 N
- Basic Static Load Rating (C₀r): 3,900–120,000 N
- Limiting Speed (Grease): 7,000–24,000 rpm
7300 Series – Medium Angular Contact Ball Bearing
Heavy Duty Customizable
7300 series is the heaviest standard single-row angular contact ball bearing series, designed for maximum load capacity in demanding industrial applications with 40° contact angle.
- Inner Diameter (d): 10–130 mm
- Outer Diameter (D): 35–280 mm
- Width (B): 11–58 mm
- Basic Dynamic Load Rating (Cr): 10,800–200,000 N
- Basic Static Load Rating (C₀r): 6,100–170,000 N
- Limiting Speed (Grease): 5,500–18,000 rpm
Double Row Angular Contact Ball Bearing
Combined Load Customizable
5200/5300 series double-row angular contact bearings with two rows of balls handle combined radial and axial loads efficiently, offering superior load capacity and rigidity for demanding applications.
- Inner Diameter (d): 10–100 mm
- Outer Diameter (D): 30–215 mm
- Width (B): 14–73 mm
- Basic Dynamic Load Rating (Cr): 10,200–186,000 N
- Basic Static Load Rating (C₀r): 6,000–163,000 N
- Limiting Speed (Grease): 4,500–16,000 rpm
Four-Point Contact Ball Bearing
Bi-directional Axial Customizable
QJ series four-point contact ball bearings feature a single row that handles axial loads in both directions, providing space-saving solutions for applications requiring bidirectional thrust load capacity.
- Inner Diameter (d): 20–200 mm
- Outer Diameter (D): 47–360 mm
- Width (B): 15–58 mm
- Basic Dynamic Load Rating (Cr): 15,600–280,000 N
- Basic Static Load Rating (C₀r): 14,000–305,000 N
- Limiting Speed (Grease): 3,800–12,000 rpm
Matched Pair Angular Contact Ball Bearings
High Precision Pre-loaded
DB/DF/DT arranged matched pairs are pre-loaded and pre-assembled for high-precision applications, eliminating axial play and providing superior rigidity for demanding industrial and machine tool spindle applications.
- Available Arrangements: Back-to-Back (DB), Face-to-Face (DF), Tandem (DT)
- Preload Classes: Light (GA), Medium (GB), Heavy (GC)
- Available Series: 7000, 7200, 7300
- Precision Grades: P5, P4, P2
- Features: Pre-loaded matched sets, zero axial play, high rigidity
- Applications: Machine tool spindles, precision equipment, high-speed drives
Applications
Machine Tool Spindles
High-speed precision for CNC lathes, milling machines, and grinding spindles with exceptional rigidity and accuracy requirements.
Pumps & Compressors
Combined radial and thrust load support for industrial fluid handling equipment operating under continuous demanding loads.
Automotive Drivetrain
Reliable performance in gearboxes, differentials, and wheel hubs under combined loads in automotive applications.
Robotics & Precision Equipment
High accuracy positioning for robotic arms, indexing tables, and measuring instruments requiring precision and repeatability.
About BOM Bearing
BOM Bearing is a professional manufacturer and supplier of high-quality angular contact ball bearings, providing precision-engineered solutions for demanding industrial applications worldwide.
- Quality Assurance: ISO 9001 certified manufacturing with strict quality control at every production stage
- Contact Angle Options: 15°, 25°, 30°, 40° available for optimal load distribution and speed characteristics
- Custom Solutions: Tailored bearing designs including precision grades P5/P4/P2, preload classes, and cage materials
- Technical Support: Professional engineering team for product selection, application analysis, and troubleshooting
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery
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Frequently Asked Questions (FAQ)
What contact angle should I choose?
15° contact angle for high-speed applications with low axial loads. 25° for general-purpose applications with moderate combined loads. 40° for heavy axial loads and lower speeds. Higher contact angles provide greater axial load capacity but reduce maximum speed limits.
What is the difference between DB, DF, and DT arrangements?
DB (back-to-back) arrangement handles moments and bidirectional axial loads with wide effective spacing. DF (face-to-face) has narrow spacing and accommodates shaft deflection. DT (tandem) arrangement doubles unidirectional axial load capacity for extreme thrust requirements.
Can angular contact bearings handle pure radial loads?
Single-row angular contact bearings generate an axial force component under radial load, so they should be paired or used with a second bearing for load balance. Double-row or four-point contact bearings can handle pure radial loads independently without requiring a paired bearing.
What precision grades are available?
Standard ABEC 1 (P0) through ultra-precision ABEC 9 (P2) are available. For machine tool spindles, P4 or P2 precision grades are recommended. For general industrial use, P5 or P0 is typically sufficient. Higher precision grades require tighter dimensional tolerances and cost more.
Can BOM provide custom angular contact ball bearings?
Yes, we offer full customization in contact angles (15°, 25°, 30°, 40°), precision grades (P5/P4/P2), preload classes (GA/GB/GC), cage materials, special coatings, and matched pair configurations to meet your specific application requirements.
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