71905 ACDGD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71905 ACDGD/P4A Bearing Product Overview & Core Advantages
The 71905 ACDGD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. As a single bearing with a 25° contact angle and Heavy preload (Class D), it is engineered to support high combined loads—significant axial loads in one direction alongside radial loads. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed, high-reliability spindles and precision machinery. The bearing is Universal Matchable (SU), allowing for precise axial clearance adjustment when mounted with other bearings from the same manufacturing batch.
71905 ACDGD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| 71905 | Basic designation: 9mm series, 25mm bore, 42mm OD. |
| AC | Angular Contact design with a 25° contact angle. |
| DGD | Duplex arrangement: Back-to-Back (DB) mounting with Heavy preload (Class D). |
| P4A | High-Precision Tolerance Class, exceeding ABEC 7/ISO P4 standards for runout and dimensional accuracy. |
71905 ACDGD/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The 25° contact angle and Heavy preload provide superior stiffness, effectively resisting deformation under high combined loads. This design is critical for maintaining positional accuracy in demanding applications.
High-Speed Performance: The lightweight, durable phenolic resin cage minimizes centrifugal forces and ensures stable operation at the high limiting speed of 53,000 rpm. The optimized internal geometry further enhances high-speed capability.
Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and exceptional rotational accuracy. The Universal Match (SU) feature ensures predictable performance when used in sets.
Material & Lubrication: Constructed from high-grade chrome steel for both rings and balls, ensuring long service life and fatigue resistance. The bearing comes pre-lubricated for immediate operation within a temperature range of -30°C to 110°C.
71905 ACDGD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- High-Frequency Motors: Spindles for PCB drilling and small precision motors.
- Medical Equipment: Dental handpieces and high-speed surgical drills.
- Aerospace Instrumentation: Gyroscopes and other precision navigation systems.
