7217 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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7217 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 7217 CDGA/HCP4A is a high-precision, single-row angular contact ball bearing engineered for demanding applications. Its core advantage lies in its ability to handle combined loads (radial and axial) simultaneously with exceptional accuracy and stability. Manufactured to a P4A tolerance class and featuring a Universal Matchable (SU) designation, it is designed for ultra-precise spindle arrangements. The use of ceramic balls and a phenolic cage contributes to its status as a high-speed bearing, offering reduced friction, lower operating temperatures, and extended service life. Its extra light preload (Class A) ensures minimal deflection under high-speed operation, making it ideal for applications requiring supreme rotational accuracy.
7217 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 7217: Basic series number (Bore: 85 mm, OD: 150 mm, Width: 28 mm).
- C: 15° contact angle, optimized for high-speed performance.
- D: Signifies a phenolic (polyamide) cage material.
- GA: Indicates a specific internal clearance and preload combination (Extra light preload / Class A).
- HC: Denotes the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4A: The tolerance class, specifying extremely tight dimensional and running accuracy exceeding ABEC 7.
7217 CDGA/HCP4A Bearing Structural Features & Performance Benefits
High-Speed & High-Rigidity Performance: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, enabling a high limiting speed of 17,000 rpm. This hybrid construction also provides increased stiffness and reduces heat generation.
Precision & Accuracy: Manufactured to P4A super-precision standards, this bearing ensures minimal runout and vibration, which is critical for maintaining positioning accuracy in high-end machinery.
Universal Matching Capability (SU): As a Universal Matchable bearing, it can be mounted in any combination (back-to-back, face-to-face, or tandem) with other SU-designated bearings to form a matched set without requiring selective assembly, simplifying installation and optimizing system performance.
Optimized Load Capacity: The 15° contact angle is engineered to support significant combined loads, offering a high dynamic load rating for its compact cross-section.
7217 CDGA/HCP4A Bearing Typical Application Areas
The 7217 CDGA/HCP4A is the bearing of choice for high-performance applications where speed, precision, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy actuators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
