71904 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71904 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71904 ACD/P4ADGB is a metric precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This universal matchable bearing belongs to the P4A tolerance class, ensuring ultra-precise dimensions and runout for demanding machinery. Its primary advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-speed spindles and precision systems. The light preload (Class B) minimizes deflection under operational forces, enhancing system stability and positioning accuracy.
71904 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
- 71904: Basic designation indicating a metric, light series angular contact ball bearing with 20mm bore, 37mm OD, and 18mm width.
- AC: Angular Contact design with a 25° contact angle, optimized for axial load capacity.
- D: Indicates a Universal Matchable (SU) design, allowing two bearings to be mounted in any combination (face-to-face, back-to-back, or tandem) without pre-set internal clearance.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7 standards, with strict controls on bore, outer diameter, width, and runout tolerances.
- DGB: Signifies a Light Preload (Class B), providing minimal internal clearance for high rigidity and reduced deflection under load.
71904 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing delivers exceptional dimensional stability and smooth operation at high speeds. The light preload ensures minimal axial and radial play, crucial for applications requiring high positional accuracy.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, it efficiently handles combined radial and axial loads. The dynamic load rating of 2106 lbf and static load rating of 1372 lbf provide reliable performance under demanding conditions.
High-Speed Capability: The lightweight phenolic cage and precision-ground chrome steel components enable a limiting speed of 100,500 rpm, making it suitable for high-speed spindle applications.
Universal Matching Flexibility: As a Universal Matchable (SU) bearing, it can be paired with another identical bearing in any configuration, simplifying inventory and assembly while providing design flexibility for various load and stiffness requirements.
71904 ACD/P4ADGB Bearing Typical Application Areas
This high-precision angular contact ball bearing is specifically engineered for applications demanding extreme accuracy and speed:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Robotics: Joint and arm mechanisms requiring accurate positioning
- Medical Equipment: Dental handpieces, surgical tools, and imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and flight control mechanisms
- High-Frequency Motors: Spindle motors and high-RPM drive systems
