S7216 CD/P4AQBCB
Sealed Super Precision Angular Contact Ball Bearings
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S7216 CD/P4AQBCB Bearing Product Overview & Core Advantages
The S7216 CD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. Engineered as a matched set of four bearings in a back-to-back (QBC) arrangement, this configuration provides superior moment stiffness and stability. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and preloaded design contribute to smooth operation under combined radial and axial loads.
S7216 CD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7216 | Basic bearing designation with 80 mm bore, 140 mm OD, 104 mm width. |
| CD | Specifies a 15° contact angle and light preload (Class B). |
| P4A | Indicates high-precision tolerance class with enhanced dimensional and running accuracy. |
| QBC | Denotes a Quadruplex Back-to-Back matched set arrangement for maximum rigidity. |
S7216 CD/P4AQBCB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of withstanding heavy moment loads and complex forces, ensuring minimal deflection in critical applications.
- High Load Capacity: The angular contact design with a 15° contact angle efficiently handles combined radial and axial loads simultaneously. The matched set distributes loads evenly across all four bearings.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways contribute to low vibration and a high limiting speed of 28,000 rpm.
- Pre-Configured & Sealed: Supplied as a preloaded and sealed unit, the bearing is ready for installation, reducing assembly time and ensuring consistent performance. The integral seals protect against contamination.
S7216 CD/P4AQBCB Bearing Typical Application Areas
This bearing is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring extreme running accuracy and rigidity.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Industrial Pumps & Compressors: Where reliable performance under combined loads is critical.
