71918 CD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADGB Bearing Product Overview & Core Advantages
The 71918 CD/P4ADGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high rigidity. As a universally matchable (SU) bearing supplied in a light preload (Class B) duplex set, it is engineered to accommodate combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its P4A tolerance class and phenolic cage ensure superior running accuracy and stability, making it ideal for high-speed spindles and other precision machinery where reliability and performance are critical.
71918 CD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width). |
| CD | Contact angle of 15° and specific internal design optimized for high-speed operation. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional dimensional and running accuracy. |
| DGB | Indicates a universally matchable (SU) duplex set of two bearings arranged in a back-to-back (DB) configuration, providing high rigidity and moment load capacity. |
71918 CD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex set configuration (DGB) creates a highly rigid bearing system capable of withstanding combined radial and axial loads as well as moment loads. The 15° contact angle is optimized for high-speed performance while maintaining excellent axial load capacity.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring extreme positional accuracy and smooth operation.
- High-Speed Capability: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 15,000 rpm, reducing centrifugal forces and operating temperature.
- Universal Matchability (SU): As a universally matchable bearing, any two bearings from the same lot can be paired in any combination (back-to-back, face-to-face, or tandem) without pre-load loss, offering flexibility in mounting and system design.
71918 CD/P4ADGB Bearing Typical Application Areas
The 71918 CD/P4ADGB is predominantly used in high-precision, high-speed rotational systems, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and milling heads.
- Precision Grinding Equipment
- High-Frequency Motors and Spindles
- Medical Equipment: Such as dental handpieces and imaging devices.
- Aerospace & Defense Systems: Including gyroscopes and navigation instruments.
