71928 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71928 CD/P4A Bearing Product Overview & Core Advantages
The 71928 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, with a 15° contact angle. Its phenolic resin cage and pre-lubrication contribute to its suitability for high-speed operation up to 10,000 rpm, making it an ideal component for demanding, precision machinery.
71928 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71928 | Standard bearing series and size designation. |
| C | Designates a 15° contact angle. |
| D | Indicates the bearing is part of a matched arrangement (in this case, a single bearing supplied for universal matching). |
| P4 | Specifies the high-precision tolerance class (equivalent to ABEC-7). |
| A | Indicates that a specific preload is applied. |
71928 CD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row design with a 15° contact angle and P4 precision ensures minimal runout and high system rigidity, which is critical for maintaining accuracy under load. The dimensional tolerances for the bore diameter (140 mm) and outside diameter (190 mm) are tightly controlled.
Optimized Load Capacity: The angular contact design is optimized to carry significant combined radial and axial loads simultaneously, with a dynamic load rating of 21,510 lbf and a static load rating of 26,100 lbf.
Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and pre-lubrication enable a high limiting speed of 10,000 rpm.
Durability and Stability: Manufactured from chrome steel for both rings and balls, the bearing offers high wear resistance. The phenolic cage provides dimensional stability and operates effectively within a temperature range of -30°C to 110°C.
71928 CD/P4A Bearing Typical Application Areas
The 71928 CD/P4A is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Medical and Dental Equipment
