71811 CD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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71811 CD/P4DBB Bearing Product Overview & Core Advantages
The 71811 CD/P4DBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, ensuring high system stiffness and minimal runout. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting significant radial loads and axial loads in both directions. Manufactured to a P4 tolerance class, this bearing is ideal for high-speed, high-precision machinery where reliability and dimensional stability are critical.
71811 CD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
- 71811: Basic designation denoting a super-light series bearing with a 55 mm bore and 72 mm outside diameter.
- C: Signifies a 15° contact angle, optimized for high-speed operation and axial load capacity.
- D: Indicates the bearing is part of a duplex (paired) set.
- P4: Denotes a high-precision tolerance class, ensuring extremely tight dimensional and running accuracy.
- DBB: Specifies the duplex back-to-back arrangement. This configuration provides high moment rigidity and is excellent for withstanding overturning moments.
71811 CD/P4DBB Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide, stable support system that significantly increases moment stiffness, making it resistant to tilting moments and ensuring precise shaft positioning.
Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 3780 lbf, this bearing is engineered to efficiently handle combined radial and bidirectional axial loads.
High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces, reduced friction, and a high limiting speed of 34,000 rpm. The standard lubrication is suitable for this operational range.
Precision Engineering: Manufactured to P4 tolerance with extremely tight dimensional control on the bore, outside diameter, and width, this bearing guarantees smooth, quiet, and accurate rotation essential for precision spindles.
71811 CD/P4DBB Bearing Typical Application Areas
The 71811 CD/P4DBB is predominantly used in high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Positioning Systems
