71908 CEGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CEGB/P4A Bearing Product Overview & Core Advantages
The 71908 CEGB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Positioned in the P4A super-precision tolerance class, this bearing is designed to handle combined loads, with its 15° contact angle providing excellent resistance to axial loads in one direction while accommodating radial loads. Its light preload (Class B) ensures minimal deflection under operational stresses, making it ideal for spindle arrangements and other demanding machinery where high rigidity and positional accuracy are critical.
71908 CEGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with 40mm bore, 62mm OD, and 12mm width. |
| CEGB | Internal design code specifying a 15° contact angle, light preload (Class B), and universal matching (SU) capability for precise bearing sets. |
| P4A | Tolerance class designation, indicating super-precision dimensional and running accuracy exceeding ABEC 7 standards. |
71908 CEGB/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance standards with a phenolic resin cage, this bearing delivers exceptional dimensional stability and minimal runout, crucial for maintaining precision in high-speed operations. The light preload enhances system stiffness without generating excessive heat.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently support significant axial loads in one direction while simultaneously carrying radial loads. With a dynamic load rating of 2194 lbf and static rating of 1350 lbf, it offers reliable performance under combined loading conditions.
- Superior High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 56,000 rpm, reducing centrifugal forces and enabling smooth operation at elevated rotational velocities.
- Universal Matching Capability (SU): Designed as a universal matchable bearing, it can be paired with another identical bearing in various preloaded configurations (back-to-back, face-to-face, or tandem) to create a matched set that meets specific application stiffness and accuracy requirements.
71908 CEGB/P4A Bearing Typical Application Areas
The 71908 CEGB/P4A is specified in high-performance machinery where precision and speed are non-negotiable:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Robotics and automation drive systems
- High-Frequency Motors: Spindle motors and servo drives
- Medical Equipment: Dental handpieces and surgical tools
- Aerospace Components: Gyroscopes and navigation systems
