S7212 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S7212 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S7212 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class, it ensures high running accuracy and is pre-lubricated with grease for immediate use, making it ideal for high-speed, high-rigidity spindles and precision machinery.
S7212 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design, 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| DB | Duplex Back-to-Back mounting arrangement |
| Sealed | Integrated seals for contamination protection |
| A | Extra light preload for minimal deflection |
S7212 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The back-to-back duplex arrangement creates a wide effective spread between load centers, significantly increasing moment rigidity and operational stability under complex loading conditions.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing effectively handles combined radial and thrust loads simultaneously. The dynamic load rating of 19,890 lbf and static load rating of 20,250 lbf ensure reliable performance in demanding applications.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reducing centrifugal forces and enabling operation at limiting speeds up to 32,500 rpm. The precision-ground chrome steel components further contribute to smooth high-speed operation.
Maintenance-Free Operation: Factory-sealed and pre-lubricated with high-quality grease, the bearing offers long-term reliability without requiring relubrication within the specified temperature range of -30°C to 110°C.
S7212 ACD/P4ADBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling applications
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus
- High-Speed Rotating Equipment: Dental handpieces, small precision motors, and turbochargers
- Industrial Automation: Robotics, CNC positioning systems, and precision indexing tables
