71928 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71928 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71928 CD/P4ADGB is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing is engineered to handle combined loads (simultaneous radial and axial loads) efficiently. Its universal matchable (SU) design allows two bearings to be paired in a back-to-back, face-to-face, or tandem arrangement to optimize performance for specific load conditions. With a light preload (Class B) and a 15° contact angle, it delivers high running accuracy, reduced noise and vibration, and is ideal for high-speed operation up to 11,000 rpm.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation (140mm bore, 190mm OD). |
| C | 15° nominal contact angle. |
| D | Enhanced internal design for optimized performance. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards, with specific running accuracy requirements. |
| DGB | "Universal Matchable" bearing. Two bearings are supplied as a matched set for precise preload and alignment when paired. |
71928 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The angular contact design and light preload provide superior stiffness, enabling the bearing to support significant combined loads and moment loads with minimal deflection.
- Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent sliding properties, contributing to lower friction and stable operation at the high limiting speed of 11,000 rpm.
- Exceptional Precision: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring superior running accuracy for critical applications.
- Universal Matching Capability (SU): The DGB suffix indicates the bearings are supplied as a precision-matched pair. This simplifies installation and guarantees optimal preload and performance in duplex arrangements.
- Durable Construction: Components made from chrome steel provide high fatigue life and durability, suitable for a wide temperature range from -30°C to 110°C.
71928 CD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles (e.g., milling, grinding, and lathe spindles)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Medical and Laboratory Equipment
- Aerospace Positioning Systems
