7307AC Angular Contact Ball Bearing High Speed Precision Performance For Precision Equipment
Basic Parameters
- Bore diameter (d):35mm
- Outer diameter (D):80mm
- Width (B):21mm
- Contact angle:25° (suffix "AC" denotes standard angle)
- Weight:Approximately 0.47kg
- Structure:Single-row, non-separable design with inner/outer rings and ball assembly
Core Performance Specifications
- Load Capacity
- Dynamic load rating (Cr):38.2~40kN
- Static load rating (C0r):24.9~26.3kN
- Material:GCr15/SUJ2 high-carbon chromium bearing steel, heat-treated to achieve surface hardness of HRC58-62
- Speed & Precision
- Limiting speed:
- Grease-lubricated: 7,500~8,000rpm
- Oil-lubricated: 10,000~11,000rpm
- Precision class:Standard P0 (customizable to P5 for high-accuracy applications)
- Technical Features
- Axial-radial load capability:Supports combined radial and unidirectional axial loads; paired installation (e.g., back-to-back or face-to-face) required for bidirectional axial loads
- High-speed stability:Optimized raceway geometry and low-friction cage design (e.g., J steel stamping) enable smooth operation at elevated speeds
Structural & Environmental Adaptability
- Tolerance compatibility:
- Environmental resistance:
- Standard version: Suitable for -20°C to 120°C operating temperatures
- High-temperature variants: Up to 300°C with special heat-resistant materials
- Corrosion-resistant options: Stainless steel (e.g., SUS440C) available for harsh environments
- Sealing options:
- Open design (standard)
- Optional 2RS (rubber seals) or ZZ (metal shields) for dust/moisture protection
Typical Applications
- Industrial Machinery
- Machine tool spindles: Provides precision and rigidity for high-speed machining
- Gearboxes and reducers: Handles radial loads and torque transmission in heavy-duty systems
- Pumps and compressors: Resists axial thrust from fluid pressure
- Automotive & Transportation
- Turbochargers: Supports high-speed rotation under extreme temperatures
- Differential drives: Ensures smooth power transfer in vehicle drivetrains
- Energy & Precision Equipment
- Electric motor shafts: Optimized for low noise and vibration
- Robotics: Enables precise positioning in robotic joints
Maintenance & Lubrication Guidelines
- Lubrication:
- Grease:Lithium-based grease (e.g., NLGI 2) with 10%-15% cavity filling; synthetic grease (e.g., polyurea) recommended for high-temperature applications
- Oil:Circulating oil systems preferred for continuous high-speed operation to enhance heat dissipation
- Inspection intervals:
- Monitor temperature and noise during operation
- Replace lubricant every 2,000~5,000 hours depending on load and environment
Certifications & Compatibility
- Standards compliance:Meets ISO 281 (load ratings) and ISO 15 (precision)
- Cross-brand compatibility:Interchangeable with equivalent models from major manufacturers (e.g., NSK 7307AC, Timken 7307AC)
Customization Options
- Parameter adjustments:
- Contact angle: 15° (suffix "C") or 40° (suffix "B") available via special order
- Surface coatings: Phosphating or black oxide for corrosion resistance
- Special configurations:
- Full ceramic (Si3N4 balls) for non-magnetic or high-speed applications
- Laser-etched part numbers for traceability
Summary
The 7307AC angular contact ball bearing combines high load capacity, precision, and adaptability, making it ideal for critical industrial and automotive applications. Its non-separable design and standardized interfaces simplify installation, while material and sealing options extend its usability across diverse environments. Paired with proper lubrication and maintenance, this bearing delivers reliable performance in high-speed, heavy-load scenarios.
