71917 CE/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71917 CE/P4ADBA Bearing Product Overview & Core Advantages
The 71917 CE/P4ADBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a duplex back-to-back (DB) matched set, it excels at handling combined loads, including significant radial loads and bidirectional axial loads simultaneously. Manufactured to the stringent P4A tolerance class, this bearing offers superior running accuracy, making it ideal for high-speed, high-precision machinery. Its extra light preload (Class A) ensures minimal friction and optimal performance in precision spindles and other critical applications.
71917 CE/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD) |
| CE | Enhanced internal design for improved performance and high-speed capability |
| P4A | Precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy |
| DB | Duplex Back-to-Back arrangement; two bearings are mounted opposing each other to withstand bidirectional axial loads and provide high moment rigidity |
| A | Specifies the extra light preload applied to the matched set for optimal stiffness and minimal operational deflection |
71917 CE/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and tilting moments. This design, combined with a 15° contact angle, provides excellent capability for handling combined radial and axial loads from both directions.
High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and reduced friction at the limiting speed of 17,000 rpm. The optimized internal geometry (CE design) further enhances high-speed stability.
Precision & Accuracy: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing ensures minimal runout and vibration, which is critical for maintaining precision in demanding applications.
Material & Construction: Components made from high-grade chrome steel provide high hardness, wear resistance, and long service life. The bearing comes pre-lubricated for immediate operation.
71917 CE/P4ADBA Bearing Typical Application Areas
The 71917 CE/P4ADBA is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives: High-frequency motor spindles and servo drives.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Industrial Pumps & Compressors: For applications requiring high rotational accuracy and reliability.
