71928 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71928 CDGA/P4A Bearing Product Overview & Core Advantages
The 71928 CDGA/P4A is a single-row angular contact ball bearing designed for applications demanding ultra-high precision and exceptional rotational accuracy. Manufactured to ABEC 7/P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 15° contact angle is optimized to handle significant axial loads in one direction while accommodating combined radial and axial loads. The bearing comes pre-lubricated and features a phenolic resin cage, contributing to its high-speed capability and smooth operation. As a Universal Matchable (SU) bearing, it can be precisely paired with another identical bearing to form a back-to-back (DB) or face-to-face (DF) arrangement, enabling management of axial loads in both directions and increased system rigidity.
71928 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Basic bearing series and size designation (140mm bore, 190mm OD, 24mm width). |
| C | 15° contact angle, optimized for high axial load capacity. |
| DG | Universal Matchable bearing. Two bearings can be paired for specific preload and rigidity. |
| A | Extra light preload class. Provides minimal internal clearance for high precision and rigidity with low running torque. |
| P4A | High-precision tolerance class (equivalent to ABEC 7). Defines extremely tight limits for bore, outside diameter, and width tolerances for superior running accuracy. |
71928 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: The P4A tolerance class and extra light preload (A) ensure minimal runout and high system stiffness, which is critical for applications requiring extreme positional accuracy.
- Optimized Load Capacity: The 15° contact angle and robust construction using chrome steel rings and balls provide excellent performance under high axial loads and combined loads.
- High-Speed Performance: The lightweight and durable phenolic resin cage ensures stable operation and guidance of the balls at high rotational speeds, up to a limiting speed of 11,000 rpm.
- Universal Matching Capability: The SU/Universal Matchable (DG) designation means each bearing is manufactured to specific selective tolerances, allowing for precise pairing to achieve desired preload and rigidity without selective mounting.
- Pre-lubricated & Ready-to-Use: The bearing is supplied with lubrication, making it ready for immediate installation and operation within its specified temperature range.
71928 CDGA/P4A Bearing Typical Application Areas
The 71928 CDGA/P4A is engineered for high-performance applications where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Robotic Drives.
- High-Frequency Motors and Spindle Drives.
- Medical Equipment: CT scanners and high-speed centrifuges.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and navigation systems.
