71908 CB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CB/P4A Bearing Product Overview & Core Advantages
The 71908 CB/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing delivers superior running accuracy and is preloaded to minimize axial and radial play, ensuring high system stiffness and precise shaft positioning. Its optimized 15° contact angle is engineered to support significant combined loads, handling both radial and axial loads simultaneously. With a phenolic resin cage and factory-applied lubrication, it is well-suited for high-speed operation up to 45,000 rpm, making it an ideal component for demanding, precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series, indicating a light series, metric angular contact ball bearing with a 40mm bore. |
| C | Specifies a 15° contact angle. |
| B | Indicates the bearing is supplied with a preload for enhanced rigidity. |
| /P4A | Denotes the tolerance class P4 (ABEC-7), signifying very high precision. |
71908 CB/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row angular contact design, combined with a factory-applied preload, eliminates internal clearance. This results in superior stiffness and minimal runout, which is critical for applications requiring high positional accuracy and dynamic stability.
Superior Load Capacity: The optimized 15° contact angle enables the bearing to efficiently support combined radial and axial loads. With a dynamic load rating of 1215 lbf and a static load rating of 934 lbf, it offers reliable performance under demanding operating conditions.
High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces at high speeds. This, coupled with the bearing's precision construction, allows it to achieve a limiting speed of 45,000 rpm.
Optimized for Performance: Manufactured from chrome steel for both rings and balls, the bearing provides high durability and wear resistance. The open seal type allows for optimal lubrication management in controlled environments, while the standard factory lubrication supports immediate operation.
71908 CB/P4A Bearing Typical Application Areas
The 71908 CB/P4A is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles
- High-Frequency Motors and Spindles
- Precision Grinding Equipment
- Robotic Drives and Actuators
- Medical and Dental Equipment
- Aerospace Instrumentation and Control Systems
