71917 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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Materials
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71917 CD/P4A Bearing Product Overview & Core Advantages
The 71917 CD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Its primary advantage lies in its ability to efficiently support combined loads—simultaneously handling significant radial loads and axial loads in one direction. Manufactured to the stringent P4 (ABEC-7) tolerance class, this bearing is engineered for high-speed operation, offering superior running accuracy and low noise levels. Its compact design, featuring a phenolic cage and preloaded configuration, makes it an ideal choice for machine tool spindles and other high-performance machinery where high rigidity and precision are paramount.
71917 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71917: Basic model number denoting a metric, single-row angular contact ball bearing with an 85mm bore, 120mm OD, and 18mm width.
- C: Indicates a 15° contact angle, optimized for high-speed applications requiring high rigidity.
- D: Signifies that the bearing is supplied with a specific preload for enhanced stiffness and reduced axial/radial play.
- P4: Denotes the tolerance class P4 (ABEC-7), ensuring extremely high dimensional and running accuracy.
- A: Indicates that the bearing's internal geometry and tolerances have been optimized for a specific, high-precision mounting arrangement.
71917 CD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The angular contact design and preload work in tandem to provide superior system stiffness, minimizing deflection under load and ensuring precise shaft positioning. This is critical for applications like machine tool spindles.
Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, while the 15° contact angle and precision-ground raceways contribute to a high limiting speed of 17,000 rpm, making it a true high-speed bearing.
Superior Load Capacity: Engineered to support combined radial and axial loads, this bearing features a high dynamic load rating of 10,395 lbf and a static load rating of 10,800 lbf, ensuring long service life under demanding conditions.
Precision Materials: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and durability. The open seal type allows for customized lubrication schemes to match specific operational needs.
71917 CD/P4A Bearing Typical Application Areas
The 71917 CD/P4A is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are non-negotiable. Key application areas include:
- Machine Tool Spindles (milling, grinding, and lathe spindles)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace and Defense Actuation Systems
