7217 CD/P4AQBCD
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7217 CD/P4AQBCD Bearing Product Overview & Core Advantages
The 7217 CD/P4AQBCD is a precision quadruplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This P4A tolerance class bearing features a heavy preload (Class D), enabling it to handle significant combined loads (radial and axial) simultaneously with minimal deflection. Its matched set configuration of four bearings provides superior stiffness and rotational accuracy, making it ideal for high-precision, high-rigidity machinery where dimensional stability is critical.
7217 CD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7217 | Basic bearing designation: 85 mm bore, 150 mm OD, 112 mm width |
| C | 15° contact angle |
| D | Heavy preload (Class D) |
| /P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
7217 CD/P4AQBCD Bearing Structural Features & Performance Benefits
Optimized Rigidity and Load Distribution: The quadruplex back-to-back configuration creates a highly rigid bearing system that effectively resists moment loads and shaft deflection. This arrangement significantly enhances system stiffness, crucial for maintaining precision under heavy combined loads.
Superior Load Capacity: With a radial dynamic load rating of 59,625 lbf and radial static load rating of 79,875 lbf, this bearing sustains substantial loads while maintaining performance. The 15° contact angle provides excellent axial load capacity in both directions.
Precision Performance: Manufactured to P4A tolerance class with precise dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration. The phenolic cage offers excellent dimensional stability and reduced friction at high speeds.
Enhanced Speed Capability: The optimized design and phenolic cage material contribute to a limiting speed of 17,000 rpm, suitable for high-speed applications while maintaining precision.
7217 CD/P4AQBCD Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring maximum rigidity and accuracy
- Precision Gearboxes: Industrial transmission systems demanding high load capacity and minimal deflection
- Robotic Automation: High-precision robotic arms and positioning systems
- Aerospace Components: Critical rotating assemblies where reliability and precision are paramount
- Medical Equipment: High-speed medical imaging and surgical device rotating elements
