S71918 CDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71918 CDGA/P4A Bearing Product Overview & Core Advantages
The S71918 CDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy and performance. Operating under the stringent P4A tolerance class, this bearing excels in high-speed, high-rigidity scenarios. Its 15° contact angle and Universal Matchable (SU) design allow it to be paired to handle complex combined loads—significant radial and axial forces—simultaneously. The combination of a phenolic cage, premium chrome steel components, and factory-applied grease lubrication ensures reliable operation in demanding environments, making it an ideal choice for high-precision spindles and machinery.
S71918 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7 | Series Designation | Indicates a high-precision, high-speed bearing series. |
| 1918 | Bore & Size Code | Denotes a 90mm bore diameter with a 125mm OD and 18mm width. |
| CD | Contact Angle & Preload | Specifies a 15° contact angle with an extra light preload (Class A). |
| GA | Universal Matching | Identifies the bearing as Universal Matchable (SU), allowing for precise pairing in sets. |
| P4A | Tolerance Class | Denotes an ultra-precision tolerance grade superior to ABEC 7, ensuring minimal runout and vibration. |
S71918 CDGA/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: Manufactured to P4A tolerances with extremely tight dimensional controls (bore/OD tolerance: -0.004mm to 0), this bearing provides exceptional rotational accuracy and system stiffness, which is critical for minimizing deflection under load.
Superior Load Capacity: The 15° contact angle is optimized to handle significant combined radial and axial loads simultaneously. With a dynamic load rating of 10,688 lbf and a static load rating of 11,475 lbf, it offers reliable performance in demanding applications.
Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and grease lubrication contribute to a high limiting speed of 15,000 rpm.
Matched Set Performance: As a Universal Matchable (SU) bearing, it is designed to be used in precisely matched pairs or sets (this model is part of a 2-bearing set), enabling pre-configured preload and optimal load distribution for maximum system performance.
S71918 CDGA/P4A Bearing Typical Application Areas
The S71918 CDGA/P4A is engineered for high-performance applications where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring machines and optical scanners.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
