71917 ACD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 71917 ACD/P4ADBD is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This duplex back-to-back (DB) matched set features a heavy preload (Class D), enabling it to withstand significant combined loads—both radial and axial forces—simultaneously. Manufactured to a P4A tolerance class, it delivers superior running accuracy and rotational precision, making it ideal for high-performance machinery where stability and minimal deflection are critical. Its robust construction ensures high rigidity and reliable operation in demanding conditions.
71917 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing series and size designation (85mm bore, 120mm OD, 36mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex Back-to-Back (DB) mounting arrangement |
| P4A | High precision tolerance class for superior running accuracy |
| DB | Duplex Back-to-Back preloaded pair (2 bearings in set) |
71917 ACD/P4ADBD Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration with heavy preload creates an extremely rigid bearing system, effectively resisting moment loads and maintaining shaft positioning under severe combined radial and axial loads. With a radial dynamic load rating of 16,088 lbf and static load rating of 20,588 lbf, it delivers exceptional load-bearing performance.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for high-precision applications.
Optimized Internal Design: The 25° contact angle provides optimal axial load capacity while maintaining good radial performance. The phenolic cage offers excellent strength-to-weight ratio and operates effectively at high speeds.
Performance Characteristics: With a limiting speed of 28,000 rpm and chrome steel construction throughout, this bearing maintains dimensional stability across its operating temperature range of -30°C to 110°C.
71917 ACD/P4ADBD Bearing Typical Application Areas
The 71917 ACD/P4ADBD is specifically engineered for high-precision, high-rigidity applications including:
- Machine Tool Spindles - Providing precise rotational accuracy and stiffness for milling, grinding, and turning operations
- Precision Gearboxes - Supporting high torque transmission with minimal deflection
- Industrial Pumps & Compressors - Handling combined loads in demanding fluid handling systems
- Robotic Arm Joints - Delivering the rigidity and precision required for automated manufacturing
- Aerospace Actuation Systems - Meeting the stringent reliability and performance requirements of flight control systems
