71911 CD/P4ADFB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71911 CD/P4ADFB Bearing Product Overview & Core Advantages
The 71911 CD/P4ADFB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. As part of a matched duplex pair in a Face-to-Face (DF) arrangement, this bearing is preloaded to deliver superior system stiffness and rotational precision. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery. The combination of a 15° contact angle and light preload optimizes it for applications involving combined radial and axial loads.
Model Code Breakdown
- 71911: Basic bearing series and size designation (55mm bore, 80mm OD, 26mm width).
- C: Represents a 15° contact angle.
- D: Indicates the bearing is part of a duplex matched set.
- P4A: Denotes a very high precision tolerance class, exceeding ABEC 7 standards.
- DF: Specifies the Duplex Face-to-Face mounting arrangement of the matched pair.
- B: Signifies a Light preload / Class B.
71911 CD/P4ADFB Bearing Structural Features & Performance Benefits
The performance of the 71911 CD/P4ADFB is derived from its meticulous design and construction. The duplex face-to-face configuration provides high system rigidity and excellent resistance to moment loads. The phenolic resin cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 34,000 rpm. Manufactured from high-grade chrome steel for both rings and balls, it ensures durability and a long operational life. The specified light preload (Class B) eliminates internal clearance, minimizing axial and radial run-out for exceptional rotational accuracy, which is critical in high-speed and high-precision applications.
71911 CD/P4ADFB Bearing Typical Application Areas
This high-precision, preloaded bearing set is engineered for the most demanding sectors, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and navigation instruments.
