7211 CD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7211 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7211 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high rigidity. This back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, ensuring optimal stiffness and minimal axial/radial play under operating conditions. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it ideal for high-precision, high-speed machinery where positioning accuracy is critical. Manufactured to P4A tolerance class, this bearing offers superior running accuracy for demanding applications.
7211 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7211 | Basic bearing series, indicating a 55mm bore, 100mm OD, and 42mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC-7), ensuring extremely tight dimensional and running accuracy. |
| DB | Denotes the Back-to-Back arrangement of the matched pair, providing high moment rigidity. |
| C | Specifies the Moderate preload (Class C) applied to the matched set. |
7211 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Preload: The duplex back-to-back (DB) arrangement with a Moderate (C) preload creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring exceptional positional stability.
Superior Load Capacity: The 15° contact angle and optimized internal geometry enable the bearing to handle significant combined radial and axial loads simultaneously. With a dynamic load rating of 20,340 lbf and static load rating of 19,125 lbf, it offers reliable performance under demanding conditions.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio and smooth operation at high speeds, contributing to the bearing's limiting speed of 34,000 rpm. The open design facilitates efficient lubrication for thermal management.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing delivers exceptional running accuracy and low vibration levels essential for precision applications.
7211 CD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes requiring exceptional rigidity and accuracy
- Precision Gearboxes: Industrial transmission systems where high rotational accuracy and load capacity are critical
- High-Speed Motors: Servo motors, spindle motors, and other high-RPM electric motor applications
- Medical Equipment: Dental handpieces, centrifuge rotors, and other medical devices requiring precision and reliability
- Aerospace Components: Guidance systems, actuator mechanisms, and auxiliary power units
