71812 ACDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71812 ACDGB/P4 Bearing Product Overview & Core Advantages
The 71812 ACDGB/P4 is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a Universal Matchable (SU) designation, it can be universally paired with other bearings of the same type to form a preloaded duplex set, offering superior system rigidity. Its key advantages include the ability to handle combined loads (radial and axial), a light preload (Class B) for reduced noise and vibration, and a P4 tolerance class ensuring ultra-precise running accuracy. The open design, combined with a phenolic cage, makes it ideal for high-speed, high-reliability spindles and precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing series and size designation (60mm bore, 78mm OD, 10mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Optimized internal geometry for high-speed operation. |
| GB | Light Preload / Class B. The bearing is preloaded to minimize axial play and enhance system stiffness. |
| /P4 | P4 Tolerance Class. Denotes very high precision levels for bore, outer diameter, and width tolerances. |
71812 ACDGB/P4 Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of a phenolic resin cage and optimized internal design enables a high limiting speed of 33,000 rpm, making it an excellent high-speed bearing for spindle applications.
High Rigidity and Load Capacity: The 25° contact angle and light preload provide high rigidity, allowing the bearing to effectively support combined radial and axial loads. With a dynamic load rating of 2858 lbf and a static load rating of 3015 lbf, it offers reliable performance under demanding conditions.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional control on the bore, outer diameter, and width, this bearing ensures minimal runout and superior rotational accuracy.
Universal Matching (SU): This feature allows any number of these single bearings to be universally matched in any combination (back-to-back, face-to-face, or tandem) to create a custom duplex bearing set with pre-defined preload and stiffness.
71812 ACDGB/P4 Bearing Typical Application Areas
The 71812 ACDGB/P4 is engineered for high-performance applications where precision and speed are critical. Typical uses include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace Systems: Gyroscopes and navigation instruments.
