71918 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CDGB/P4A Bearing Product Overview & Core Advantages
The 71918 CDGB/P4A is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and high-speed performance. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 15° contact angle and light preload (Class B) make it ideally suited for applications where high rigidity and minimal deflection under combined loads are critical. As a Universal Matchable (SU) bearing, it can be paired with others in sets to achieve specific preload and stiffness requirements, offering exceptional versatility for precision spindle designs.
71918 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Bearing series and size designation (90mm bore, 125mm OD, 18mm width) |
| C | 15° contact angle |
| D | Light preload |
| G | Universal matching bearing |
| B | Phenolic (resin) cage |
| /P4A | High-precision tolerance class exceeding ABEC 7 |
71918 CDGB/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to low friction and heat generation, enabling a high limiting speed of 15,000 rpm. This makes it an excellent choice for high-speed spindle applications.
Exceptional Rigidity and Load Capacity: The angular contact design allows the bearing to support significant combined loads (radial and axial). The specified light preload eliminates internal clearance, enhancing system stiffness and rotational accuracy under operational loads.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, this bearing ensures predictable performance and precise shaft positioning.
Optimized Internal Design: With 26 high-grade chrome steel balls of 11.112 mm diameter, the bearing achieves a high dynamic load rating of 10,688 lbf and a static load rating of 11,475 lbf, ensuring long service life under demanding conditions.
71918 CDGB/P4A Bearing Typical Application Areas
The 71918 CDGB/P4A is engineered for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: CNC machining centers and high-frequency spindles.
- Robotics: High-accuracy robotic arm joints and rotary actuators.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other critical guidance systems.
