7208 CD/P4AQBCC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7208 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 7208 CD/P4AQBCC is a precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing features a back-to-back quadruplex (QBC) matched arrangement, providing superior stability and the ability to handle combined loads (radial and axial) simultaneously. With a moderate preload (Class C), it delivers optimized stiffness for high-precision machinery, ensuring reliable performance in high-speed and high-rigidity environments.
7208 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series: 70 series angular contact, 40mm bore, 80mm OD |
| CD | Contact angle of 15° and optimized internal design |
| P4A | High precision tolerance class with enhanced dimensional and running accuracy |
| QBC | Quadruplex Back-to-Back arrangement - four bearings matched as a set |
| C | Moderate preload for optimal rigidity and thermal stability |
7208 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an exceptionally rigid bearing system capable of withstanding heavy combined radial and axial loads. This arrangement provides maximum stiffness against moment loads and shaft deflection.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), ensuring precise running accuracy and minimal vibration for high-speed applications up to 41,000 rpm.
Optimized Internal Design: Features 14 chrome steel balls with 11.112mm diameter, arranged at a 15° contact angle for balanced load distribution. The phenolic cage provides excellent strength-to-weight ratio and smooth operation at high speeds.
Thermal Stability: The moderate preload (Class C) ensures consistent performance across the operating temperature range (-30°C to 110°C), maintaining precision under thermal expansion conditions.
7208 CD/P4AQBCC Bearing Typical Application Areas
The 7208 CD/P4AQBCC is ideally suited for applications requiring ultra-high precision and rigidity:
- Machine tool spindles for high-speed milling and grinding operations
- Precision grinding machines and jig borers
- High-speed machining centers and CNC equipment
- Industrial robotics and automation systems
- Aerospace positioning systems and navigation equipment
- Medical imaging devices and precision instrumentation
