S7021 CD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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S7021 CD/P4ADBC Bearing Product Overview & Core Advantages
The S7021 CD/P4ADBC is a precision duplex back-to-back angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched pair bearing set features a P4A tolerance class for superior running accuracy and a moderate preload (Class C) for optimal stiffness. Its sealed design with grease lubrication ensures reliable performance in demanding conditions, making it ideal for high-precision spindles and machinery where combined radial and axial loads must be managed with high rigidity.
S7021 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7021 | Basic bearing designation with 105mm bore diameter |
| CD | Duplex arrangement in Back-to-Back (DB) configuration |
| P4A | High precision tolerance class for superior running accuracy |
| DBC | Indicates moderate preload (Class C) for optimal stiffness |
S7021 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and maintains precise shaft positioning. Combined with P4A tolerance class and 15° contact angle, this configuration delivers exceptional running accuracy for demanding applications.
Superior Load Capacity: With a radial dynamic load rating of 35,100 lbf and radial static load rating of 43,425 lbf, this bearing handles significant combined radial and axial loads simultaneously. The optimized 21 chrome steel balls with 17.462mm diameter ensure reliable load distribution.
Enhanced Performance: The phenolic cage material contributes to smooth operation at high speeds, while the sealed design with grease lubrication provides maintenance-free operation within the temperature range of -30°C to 110°C. The moderate preload eliminates internal clearance for improved system stiffness.
S7021 CD/P4ADBC Bearing Typical Application Areas
- Machine tool spindles requiring high precision and rigidity
- High-speed machining centers and precision grinding machines
- Industrial pumps and compressors with demanding load requirements
- Precision instrument spindles and measuring equipment
- Robotic arm joints and automation equipment requiring accurate positioning
- Aerospace components and specialized industrial machinery
