71917 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71917 ACD/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, including significant radial and bidirectional axial loads. Manufactured to a P4A tolerance class, it ensures high running accuracy, making it ideal for high-speed spindles and other precision machinery where reliability and performance are critical.
71917 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Bearing series and size designation (85mm bore, 120mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex Back-to-Back (DB) mounting arrangement |
| P4A | High Precision Tolerance Class (exceeds ABEC 7) |
| DBB | Universal matching not required; supplied as a pre-matched set |
71917 ACD/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 provides exceptional stability under combined radial and axial loads. The 25° contact angle is optimized for supporting substantial axial loads in both directions.
Precision & High-Speed Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal runout and smooth operation. The phenolic cage offers excellent strength-to-weight ratio and is ideal for high-speed applications, contributing to a limiting speed of 28,000 rpm.
Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing provides high fatigue life and wear resistance. The open seal type allows for optimal lubrication management in controlled environments.
71917 ACD/P4ADBB Bearing Typical Application Areas
The 71917 ACD/P4ADBB is engineered for high-performance applications, including:
- Machine Tool Spindles (milling, grinding, turning centers)
- High-Frequency Motors and Precision Spindles
- Industrial Pumps and Compressors
- Robotic Drives and Positioning Systems
- Aerospace & Defense Actuation Systems
