S7028 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
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S7028 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S7028 ACD/P4AQBCA is a precision quadruplex matched set of double row angular contact ball bearings, engineered for the most demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is designed to handle combined loads—significant radial and bidirectional axial loads—simultaneously. Its back-to-back quadruplex arrangement (QBC) provides an extremely high rigid and stable system, making it ideal for high-precision, high-reliability machinery where minimal deflection under load is critical. The sealed construction and grease lubrication contribute to long service life with minimal maintenance.
S7028 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7028 | Basic bearing series and size designation | Defines the core dimensions: 140mm bore, 210mm OD, 132mm width. |
| ACD | Angular Contact, Double Row | Indicates the double row angular contact design for high load capacity and rigidity. |
| P4A | Tolerance Class | Denotes a high-precision bearing with extremely tight dimensional and running accuracy tolerances. |
| QBC | Quadruplex Back-to-Back | Specifies a matched set of four bearings in a back-to-back arrangement, providing maximum system rigidity and moment load capacity. |
| A | Preload: Extra Light (Class A) | Indicates a specific, light internal preload applied to the bearing set, optimizing it for high-speed operation and precise rotational performance. |
S7028 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row angular contact design, combined with the quadruplex back-to-back (QBC) matched arrangement, creates an exceptionally stiff bearing system. This structure is optimized to handle heavy combined loads and provides superior resistance to moment loads, ensuring precise shaft positioning and minimal deformation under operational stresses.
Precision & High-Speed Performance: Manufactured to P4A tolerance class, this bearing guarantees extremely low runout and smooth operation. The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 11,000 rpm. The 25° contact angle is optimized for supporting substantial axial loads in both directions.
Durability & Reliability: The sealed construction effectively protects the chrome steel components from contaminants. Combined with factory-applied grease lubrication, this design ensures long-term, maintenance-free operation within a wide temperature range of -30°C to 110°C.
S7028 ACD/P4AQBCA Bearing Typical Application Areas
The S7028 ACD/P4AQBCA is ideally suited for high-performance machinery where ultimate precision, rigidity, and speed are non-negotiable. Key applications include:
- High-Precision Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed Spindles for PCB drilling and routing
- Industrial Pumps and Compressors requiring high axial stiffness
- Precision Rotary Tables and Indexing Heads
- Aerospace and Defense positioning systems
