7204AC Angular Contact Ball Bearings Single Row High Load Capacity Bearing

7204AC Angular Contact Ball Bearing: High-Precision, High-Speed Performance

Basic Parameters

• Bore diameter (d):20mm
• Outer diameter (D):47mm
• Width (B):14mm
• Contact angle:25° (suffix "AC" denotes standard angle)
• Weight:Approximately 0.112kg
• Structure:Single-row, non-separable design with inner/outer rings and ball assembly (J steel stamping cage or brass solid cage optional)

Core Performance Specifications

1. Load Capacity
   • Dynamic load rating (Cr):14.0kN (standard configuration)
   • Static load rating (C0r):7.82kN (typical value)
   • Material:GCr15/SUJ2 high-carbon chromium bearing steel, heat-treated to HRC58-62 for wear resistance
2. Speed & Precision
   • Limiting speed:
     • Grease-lubricated: 13,000~16,000rpm (NACHI/SKF reference)
     • Oil-lubricated: 18,000~21,000rpm (optimized for high-speed applications)
   • Precision class:Standard P0 (customizable to P5/P4 for high-accuracy machinery)
3. Technical Features
   • Axial-radial load capability:Supports combined radial loads and unidirectional axial thrust; paired installation (e.g., back-to-back) required for bidirectional loads
   • High-speed stability:Optimized raceway geometry reduces friction and heat generation during continuous operation

Structural & Environmental Adaptability

• Tolerance compatibility:
  • Shaft: H7/k6
  • Housing: J7
• Temperature range:
  • Standard: -20°C to 120°C
  • High-temperature variants: Up to 300°C with special heat-resistant materials
• Sealing options:
  • Open design (standard)
  • Optional 2RS (rubber seals) or ZZ (metal shields) for dust/moisture protection

Typical Applications

1. Industrial Machinery
   • Machine tool spindles:Provides rigidity for high-speed machining (e.g., CNC lathes)
   • Gearboxes and reducers:Handles radial loads in transmission systems (e.g., automotive differentials)
   • Pumps and compressors:Resists axial thrust from fluid pressure in industrial fluid systems
2. Automotive & Transportation
   • Turbochargers:Supports high-speed rotation (up to 200,000rpm) in hybrid/electric vehicles
   • Electric motor shafts:Optimized for low noise and vibration in EV drivetrains
3. Precision Equipment
   • Robotics:Enables precise positioning in robotic joints and actuators
   • Medical devices:Used in high-speed dental handpieces and diagnostic equipment

Maintenance & Lubrication Guidelines

• Lubrication:
  • Grease:Lithium-based grease (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 every 8-12 hours of operation
  • Replace lubricant every 2,000~5,000 hours depending on load and environment

Certifications & Compatibility

• Standards compliance:Meets ISO 9001:2015 and industry standards (e.g., ISO 281 for load ratings)
• Cross-brand compatibility:Interchangeable with equivalent models from major manufacturers (e.g., NSK 7204AC, Timken 7204AC)

Summary

The 7204AC 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.