7018 CD/P4AQBCA
7000 Series Super Precision Angular Contact Ball Bearings
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7018 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 7018 CD/P4AQBCA is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing features a back-to-back quadruplex matched arrangement (QBC), enabling it to handle complex combined loads including significant radial and bidirectional axial loads simultaneously. Its extra light preload (Class A) ensures minimal deflection and smooth operation, making it ideal for high-speed spindles and other high-precision machinery where stability and positional accuracy are paramount.
7018 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Standard bearing series designation, indicating the basic size (90mm bore, 140mm OD). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and axial load capacity. |
| D | Indicates the bearing is supplied pre-lubricated from the factory. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7 standards, for applications requiring extreme running accuracy. |
| QBC | Signifies a Quadruplex Back-to-Back matched set of four bearings, providing maximum system rigidity and moment load capacity. |
7018 CD/P4AQBCA Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and high moment loads. This design is critical for minimizing shaft deflection under load, ensuring precision in machining and positioning.
Optimized for High-Speed Operation: The 15° contact angle and lightweight phenolic cage work in concert to reduce centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm. This makes the bearing suitable for high-speed spindle applications.
Precision and Longevity: Manufactured to P4A tolerance standards with chrome steel rings and balls, this bearing guarantees exceptional running accuracy and long service life. The factory-applied lubrication ensures immediate operational readiness and protection during the initial run-in period.
7018 CD/P4AQBCA Bearing Typical Application Areas
The 7018 CD/P4AQBCA is engineered for the most demanding high-precision and high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and navigation systems.
- High-Frequency Motors and Spindles: Where minimal runout and thermal stability are required.
