71908 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71908 CDGB/P4A Bearing Product Overview & Core Advantages
The 71908 CDGB/P4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A super-precision tolerance class, it delivers superior running accuracy and dimensional stability. Its key advantage lies in its ability to support combined loads (radial and axial) efficiently in one direction, making it ideal for high-speed spindles and precision machinery. The light preload (Class B) ensures minimal deflection under operational forces, while the phenolic cage contributes to smooth, high-speed operation.
71908 CDGB/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 a 40mm bore. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| DGB | Indicates a Universal Matchable (SU) bearing. "D" signifies a specific face-to-face or back-to-back pairing capability, "GB" indicates a specific preload group (Light / Class B). |
| /P4A | Denotes the tolerance class, signifying super-precision levels with very tight dimensional and running accuracy tolerances. |
71908 CDGB/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The P4A tolerance class ensures minimal runout and vibration, critical for applications like machine tool spindles. The 15° contact angle provides an optimal balance between axial load capacity and speed capability, enhancing system rigidity.
Optimized for High-Speed Operation: The lightweight phenolic resin cage offers excellent strength and low friction at high rotational speeds, contributing to the high limiting speed of 56,000 rpm. The open design allows for efficient lubrication management.
Superior Load Capacity: Engineered with a high number of chrome steel balls (21 balls, 6.35mm diameter), this bearing achieves a high dynamic load rating of 2790 lbf and a static load rating of 1912 lbf, ensuring reliable performance under demanding combined loads.
Universal Matching & Preload: Designed as a Universal Matchable (SU) bearing, it can be mounted in sets (typically 3 bearings) to create a preloaded arrangement (Face-to-Face, Back-to-Back, or Tandem) without selective assembly, simplifying installation and achieving the desired system stiffness.
71908 CDGB/P4A Bearing Typical Application Areas
The 71908 CDGB/P4A is ideally suited for high-performance machinery requiring extreme precision and speed:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical Equipment: Dental handpieces and high-speed scanners.
- Aerospace & Defense Systems: Gyroscopes and navigation instruments.
