71918 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71918 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded (Light / Class B) to deliver superior system stiffness and precise shaft positioning. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously, making it an ideal choice for high-precision, high-speed machinery where operational reliability is paramount.
71918 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Bearing series and size designation (90mm bore, 125mm OD, 36mm width) |
| C | 15° contact angle, optimized for axial load capacity |
| D | Duplex (two bearings in a set) |
| P4A | High-precision tolerance class (exceeds ABEC 7), ensuring minimal runout and vibration |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity |
| B | Light preload classification for optimal stiffness and speed performance |
71918 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide effective spread, significantly increasing the bearing system's resistance to moment loads and tilting. This setup provides exceptional rigidity and enables the bearing to support substantial combined loads (radial and bidirectional axial).
Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal dimensional variation and superior running accuracy. The lightweight phenolic cage and optimized internal geometry contribute to lower friction and enable a high limiting speed of 15,000 rpm, making it suitable for demanding high-speed applications.
Material & Construction: Components are manufactured from high-grade chrome steel, ensuring high durability and fatigue life. The set comes pre-lubricated for immediate operation, suitable for a temperature range of -30°C to 110°C.
71918 CD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for critical applications in:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes: Where precise shaft alignment and low runout are essential.
- High-Frequency Spindles: In PCB drilling, engraving, and other high-RPM machining operations.
- Industrial Pumps & Compressors: For handling axial and radial loads in demanding fluid-handling systems.
