S7028 ACDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S7028 ACDGA/P4A Bearing Product Overview & Core Advantages
The S7028 ACDGA/P4A is a high-precision, double-row angular contact ball bearing engineered for demanding applications requiring exceptional rigidity and running accuracy. Its design enables it to support combined loads (radial and bidirectional axial loads) simultaneously, making it an ideal choice for high-speed spindles and precision machinery. Manufactured to the stringent P4A tolerance class and featuring a phenolic cage with preloaded configuration, this bearing delivers superior performance, reliability, and long service life in compact installations.
S7028 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7028 | Basic bearing series and size designation (140mm bore, 210mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Double-row construction for high rigidity and increased load capacity. |
| GA | Indicates a preloaded set (Extra light / Class A) and that the bearing is Universal Matchable (SU), allowing for flexible mounting arrangements in sets of 3. |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration for ultra-high precision applications. |
S7028 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The double-row design significantly increases the bearing's moment stiffness and enables it to handle substantial combined radial and axial loads from both directions, providing stable and precise shaft guidance.
Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, minimizes friction, and contributes to the high limiting speed of 11,000 rpm. The standard grease lubrication is optimized for this performance envelope.
Super-Precision Operation: Manufactured to P4A tolerances with a bore and outer diameter tolerance of -0.004mm to 0, this bearing guarantees exceptional running accuracy, low noise, and minimal heat generation, which is critical for precision machining and metrology.
Sealed and Ready-to-Use: As a sealed bearing, it is protected from contamination and comes pre-lubricated, offering a maintenance-free solution within its specified temperature range of -30°C to 110°C.
S7028 ACDGA/P4A Bearing Typical Application Areas
The S7028 ACDGA/P4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles for CNC milling, grinding, and turning centers
- High-frequency Precision Spindles
- Robotic arm joints and precision gearboxes
- Advanced medical and dental equipment
- High-speed pumps and compressors
