71917 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71917 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71917 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement bearing set is preloaded to Extra Light (Class A) specifications, providing superior system stiffness and minimal runout. Engineered to accommodate combined loads (radial and axial), it is ideal for high-precision, high-reliability machinery where positional accuracy is critical. The bearing features a P4A tolerance class for ultra-precision performance and is pre-lubricated for immediate operation.
71917 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing designation, indicating a metric angular contact ball bearing with 85mm bore, 120mm OD, and 36mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex arrangement, specifically Back-to-Back (DB) configuration. |
| P4A | High precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| DBA | Specific preload designation: Extra Light preload (Class A). |
71917 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and maintains shaft positioning under combined loads. The Extra Light preload eliminates internal clearance, enhancing system stiffness and rotational accuracy.
Superior Load Capacity: With a 25° contact angle, this bearing is optimized to handle significant axial loads in both directions, as well as radial loads. The dynamic load rating of 16,088 lbf and static load rating of 20,588 lbf ensure reliable performance under demanding conditions.
Precision & High-Speed Performance: The P4A tolerance class guarantees ultra-precision operation. The phenolic cage contributes to smooth operation at high speeds, with a limiting speed of 28,000 rpm. This makes it suitable for high-speed spindle applications.
Material & Construction: Manufactured from chrome steel for both rings and balls, the bearing offers high durability and wear resistance. The open seal type allows for optimal lubrication management in controlled environments.
71917 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: Applications demanding accurate shaft positioning and minimal deflection.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Medical Equipment: High-speed dental handpieces and surgical tool drives.
- Aerospace Actuation Systems: Control surface actuators and other precision mechanisms.
