71812 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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71812 CD/P4DBB Bearing Product Overview & Core Advantages
The 71812 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial loads). With its P4 tolerance class and light preload (Class B), it delivers high running accuracy and is optimized for high-speed operation up to 33,000 rpm. Its compact design, with a 60 mm bore and 78 mm outside diameter, makes it an ideal choice for high-performance machinery.
71812 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation, indicating a duplex angular contact ball bearing with specific dimensions. |
| CD | Indicates a 15° contact angle and specific internal design for optimized load distribution. |
| P4 | Specifies the tolerance class P4, denoting very high precision for running accuracy and dimensional stability. |
| DB | Denotes the Duplex Back-to-Back matched arrangement, which increases rigidity and moment load capacity. |
71812 CD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back (DB) duplex arrangement creates a wide effective spread, significantly increasing system rigidity and resistance to moment loads, making it suitable for applications demanding high positional accuracy.
- Superior Load Capacity: Engineered with a 15° contact angle, this bearing is optimized to handle significant combined radial and axial loads simultaneously. The dynamic load rating of 4972 lbf and static load rating of 6412 lbf ensure reliable performance under demanding conditions.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the limiting speed of 33,000 rpm. The bearing comes pre-lubricated for immediate use and optimal performance.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls on the bore, outside diameter, and width, ensuring minimal runout and vibration for high-precision applications.
71812 CD/P4DBB Bearing Typical Application Areas
The 71812 CD/P4DBB is ideally suited for high-precision and high-speed machinery, including:
- Machine Tool Spindles (e.g., milling, grinding, and lathe spindles)
- Precision Gearboxes and Transmission Systems
- High-Frequency Motors and Spindles
- Medical Equipment (e.g., high-speed dental handpieces, centrifuges)
- Robotics and Automation Arms requiring high rigidity
