71812 ACD/P4DBALT20
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 ACD/P4DBALT20 Bearing Product Overview & Core Advantages
The 71812 ACD/P4DBALT20 is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This matched pair is arranged in a Back-to-Back (DB) configuration and manufactured to P4 tolerance class, ensuring superior running accuracy. Its primary advantage lies in its ability to support combined loads (radial and axial) simultaneously while providing high stiffness and operational stability. Preloaded with an Extra light (Class A) preload, it is ideal for high-precision, high-reliability systems where minimal deflection and precise shaft positioning are critical.
71812 ACD/P4DBALT20 Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4 | Indicates a high-precision tolerance class, superior to ABEC-7. |
| DB | Specifies the bearings are supplied as a Duplex Back-to-Back matched set. |
| ALT20 | Denotes an Extra light (Class A) preload applied to the matched set. |
71812 ACD/P4DBALT20 Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex Back-to-Back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and provides exceptional shaft positioning accuracy, which is crucial for precision machinery.
- Superior Load Capacity: With a 25° contact angle, this bearing is optimized to handle significant combined radial and axial loads from both directions.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at high rotational speeds, with a limiting speed of 35,000 rpm.
- Precision Performance: Manufactured to P4 tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, ensuring smooth, quiet, and vibration-free operation.
- Optimized for Performance: The bearings are supplied as a factory-matched set with a defined preload, guaranteeing optimal performance and eliminating the need for complex on-site adjustment.
71812 ACD/P4DBALT20 Bearing Typical Application Areas
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Spindles
- Medical and Dental Equipment
- Robotic Arms and Precision Actuators
