71918 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71918 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71918 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) enables the bearing to handle combined radial and axial loads simultaneously from both directions. Manufactured to a P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed, high-precision machinery where maximum system rigidity and minimal runout are critical.
71918 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (two bearings supplied as a matched set). |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity. |
| P4A | High precision tolerance class, exceeding ABEC-7 standards for enhanced running accuracy. |
| Light Preload / Class B | The set is preloaded to eliminate internal clearance, ensuring high system stiffness and precise shaft positioning. |
71918 ACD/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's resistance to moment loads and tilting moments. This setup provides superior stiffness, making it capable of handling heavy combined loads.
Precision & High-Speed Performance: Built to P4A tolerance class with a phenolic cage, this bearing ensures smooth operation and reduced vibration at high speeds. The 25° contact angle is optimized for substantial axial load support while maintaining excellent high-speed capabilities.
Material & Durability: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance. The phenolic cage contributes to lower friction and is suitable for the specified temperature range.
71918 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes: Where precise shaft alignment and minimal deflection are paramount.
- High-Frequency Spindles: Used in PCB drilling and other applications demanding high rotational speeds.
- Industrial Pumps and Compressors: For handling significant axial and radial loads in a compact envelope.
