71918 ACE/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71918 ACE/P4ADBB Bearing Product Overview & Core Advantages
The 71918 ACE/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement provides superior stiffness and the ability to withstand combined loads (radial and axial loads) from both directions. Manufactured to P4A tolerance class with a light preload (Class B), it ensures smooth, high-precision operation, making it ideal for high-reliability machinery where positioning accuracy is critical.
71918 ACE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing designation, indicating a metric angular contact ball bearing with a 90 mm bore, 125 mm OD, and 36 mm width. |
| ACE | Internal design code specifying a 25° contact angle and optimized internal geometry. |
| P4A | Indicates a high-precision tolerance class with very tight dimensional and running accuracy limits. |
| DB | Signifies a Duplex Back-to-Back matched set, providing high moment rigidity. |
| B | Denotes a Light Preload (Class B), which minimizes deflection and ensures stable operation under light loads. |
71918 ACE/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and supports significant combined radial and axial loads from both directions. The 25° contact angle is optimized for axial load carrying capacity.
Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees exceptional running accuracy and low vibration. The lightweight phenolic resin cage ensures stable operation and contributes to the high limiting speed of 15,000 rpm, making it suitable for high-speed applications.
Material & Durability: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and fatigue life. The bearing is pre-lubricated for immediate use and reliable operation within a wide temperature range of -30°C to 110°C.
71918 ACE/P4ADBB Bearing Typical Application Areas
The 71918 ACE/P4ADBB is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles for milling, grinding, and turning centers
- High-Speed Spindles in PCB drilling and precision machining
- Precision Gearboxes and transmission systems
- Industrial Pumps and compressors requiring high axial stiffness
- Robotic Arms and automation equipment
