7217 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7217 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7217 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single-row bearing is distinguished by its 25° contact angle and P4 (ABEC-7) tolerance class, ensuring superior running accuracy. Its core advantages include the ability to accommodate combined loads (high radial and one-directional axial loads), excellent high-speed capability up to 16,000 rpm, and high operational rigidity. The combination of a phenolic cage and ceramic balls contributes to reduced friction, lower operating temperatures, and extended service life, making it ideal for high-reliability applications.
7217 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing series; 85 mm bore, 150 mm OD, 28 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | High load capacity internal design. |
| HC | Hybrid Ceramic: Features ceramic balls for enhanced performance. |
| P4 | Precision tolerance class (equivalent to ABEC-7). |
| A | Specific internal geometry for optimized performance. |
7217 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized internal geometry and 25° contact angle provide high rigidity and enable the bearing to support significant combined radial and axial loads.
- Superior High-Speed Performance: The lightweight phenolic resin cage and low-density ceramic (silicon nitride) balls minimize centrifugal forces, allowing for stable operation at the high limiting speed of 16,000 rpm.
- Extended Service Life & Reliability: Ceramic balls offer superior wear resistance, lower thermal expansion, and electrical insulation properties, which collectively enhance bearing longevity and reliability in demanding conditions.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration, which is critical for maintaining precision in high-speed spindles.
- Preload Availability: The bearing is supplied with a preload, ensuring defined axial rigidity and eliminating internal clearance for precise shaft positioning.
7217 ACD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace & Defense Systems
- Medical & Dental Equipment
