S7216 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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S7216 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S7216 CD/P4AQBCC is a precision quadruplex matched bearing set designed for applications demanding exceptional rigidity and accuracy. This metric angular contact ball bearing arrangement, configured in a Back-to-Back (QBC) quadruplex set, is engineered to handle complex combined loads, including significant radial and bidirectional axial loads. With a P4A tolerance class and moderate preload (Class C), it delivers superior rotational accuracy, high system stiffness, and reliable performance in high-precision, high-reliability machinery.
S7216 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7216 CD | Basic bearing designation (bore: 80mm, OD: 140mm, width: 26mm per bearing) | Defines the core bearing dimensions and type. |
| P4A | Tolerance Class (superior to ABEC 7/ISO P4) | Guarantees extremely tight dimensional and running accuracy for high-precision applications. |
| QBC | Quadruplex Back-to-Back matched set | Indicates a set of four bearings factory-matched and preloaded in a back-to-back arrangement to provide maximum system rigidity and moment load capacity. |
| Sealed / Grease | Integrated seals and pre-applied grease lubrication | Offers contamination protection and is lubricated for life, ensuring long-term, maintenance-free operation. |
S7216 CD/P4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely stiff bearing system that effectively resists moment loads and complex combined loads. The 15° contact angle is optimized for supporting substantial axial loads in both directions alongside high radial loads.
High-Precision Operation: Manufactured to a P4A tolerance class, this set ensures minimal runout and vibration, which is critical for applications requiring supreme accuracy. The moderate preload (Class C) eliminates internal clearance, enhancing positional accuracy and dynamic response.
Optimized for Performance: The phenolic cage contributes to smooth operation at high speeds with low friction and excellent guiding properties. The set is pre-greased and sealed, providing reliable lubrication and protection against contaminants across its specified temperature range (-30°C to 110°C).
S7216 CD/P4AQBCC Bearing Typical Application Areas
This high-rigidity, precision-matched bearing set is ideally suited for the most demanding applications, including:
- High-Precision Machine Tool Spindles (e.g., grinding, milling, and turning centers)
- High-Speed & High-Rigidity Spindles in aerospace and automotive manufacturing
- Precision rotary tables and indexing heads
- Advanced medical and laboratory equipment
- High-performance robotics and automation systems
