71911 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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71911 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71911 ACD/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. As part of a universally matchable (SU) pair, it excels at handling combined loads—simultaneously supporting high radial loads and thrust loads in one direction. Its P4A tolerance class and extra light preload (Class A) ensure exceptional running precision and minimal thermal growth, making it ideal for high-speed spindle applications where uncompromising performance is critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Bearing series and size designation (55mm bore, 80mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Optimized internal design for high stiffness and speed |
| P4A | Super-precision tolerance class (exceeding ABEC 7) |
| DG | Universal matchable (SU) designation for paired mounting |
| A | Extra light preload (Class A) for minimal friction |
71911 ACD/P4ADGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design with a 25° contact angle provides superior stiffness and enables the bearing to handle significant combined radial and axial loads. The optimized internal geometry ensures stable operation under demanding conditions.
Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, which is essential for applications requiring minimal runout and vibration.
High-Speed Capability: The lightweight phenolic cage and open design facilitate efficient lubrication and heat dissipation, supporting a high limiting speed of 34,000 rpm. The extra light preload further reduces friction and heat generation at ultra-high speeds.
Matched Set Flexibility: As a universally matchable (SU) bearing, it can be paired with another identical bearing in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without selective mounting, simplifying installation and ensuring optimal preload and performance.
71911 ACD/P4ADGA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Rotary Systems: CNC machining centers and jig borers
- High-Frequency Motors: Spindles for PCB drilling and routing
- Medical Equipment: High-speed dental handpieces and surgical tools
- Aerospace & Defense: Gyroscopes and precision guidance systems
