7217 CD/P4ADBB
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7217 CD/P4ADBB Bearing Product Overview & Core Advantages
The 7217 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched set, arranged in a Back-to-Back (DB) configuration, is engineered to handle combined loads (significant radial and axial loads from both directions) simultaneously. With its P4A tolerance class and light preload (Class B), it delivers superior running accuracy, high system stiffness, and is ideally suited for high-speed, high-precision machinery where maximum performance is critical.
Model Code Breakdown
- 7217: Basic series designation (Medium Series) with 85 mm bore diameter.
- C: Denotes a 15° contact angle, optimized for high axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- P4A: Specifies a very high precision tolerance class, exceeding ABEC 7 standards, for minimal runout and vibration.
- DB: Defines the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loading conditions.
- B: Specifies the light preload (Class B), which minimizes deflection and ensures precise shaft positioning without excessive friction or heat generation.
7217 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back design creates a wide, rigid support system that effectively resists moment loads and tilting, making it capable of handling heavy combined radial and axial loads.
Precision & High-Speed Performance: Manufactured to P4A tolerance standards and featuring a lightweight, high-strength phenolic resin cage, this bearing ensures smooth operation, reduced vibration, and allows for high limiting speeds (up to 17,000 rpm).
Optimized Preload: The light preload (Class B) is factory-set, eliminating the need for complex adjustment during installation. This preload enhances system stiffness and rotational accuracy while maintaining optimal operating temperatures.
Superior Material: Constructed from high-carbon chrome steel for rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
7217 CD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring high rigidity and running accuracy, such as:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Frequency Spindles
- Precision Gearboxes and Drives
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Positioning Systems
