71909 ACE/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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71909 ACE/P4ADGA Bearing Product Overview & Core Advantages
The 71909 ACE/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As part of the Universal Matchable (SU) series, it is supplied as a pre-set duplex pair, offering superior rigidity and the ability to accommodate combined loads (radial and axial loads simultaneously). Manufactured to P4A tolerance class, it delivers outstanding running accuracy and is pre-lubricated for immediate use, making it ideal for high-reliability, high-precision machinery.
71909 ACE/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 24mm width). |
| ACE | Signifies a 25° contact angle and Extra light (A) preload. |
| P4A | Indicates a super-precision tolerance class (equivalent to ABEC 7), ensuring minimal runout and vibration. |
| DGA | Denotes a Universal Matchable (SU) bearing supplied as a pre-set duplex pair, ready for installation. |
71909 ACE/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair arrangement provides significantly increased rigidity, enabling the bearing to handle substantial combined loads and moment loads with high stability.
- Super-Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing guarantees exceptional running accuracy, low noise, and minimal heat generation.
- Optimized High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry contribute to a high limiting speed of 41,000 rpm, reducing centrifugal forces and friction.
- Ready-to-Install Convenience: As a Universal Matchable (SU) pair, the bearings are pre-ground to a specific preload (Extra light / Class A), eliminating complex mounting calculations and ensuring optimal performance out-of-the-box.
71909 ACE/P4ADGA Bearing Typical Application Areas
This high-precision bearing is engineered for demanding applications where speed, accuracy, and rigidity are critical. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces, centrifuges, and imaging device rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
