7018 CDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7018 CDGA/P4A Bearing Product Overview & Core Advantages
The 7018 CDGA/P4A is a single-row angular contact ball bearing engineered for ultra-high precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class with an extra light preload (Class A), this bearing delivers superior running accuracy and minimal vibration. Its 15° contact angle is optimized for handling combined radial and axial loads simultaneously, making it ideal for demanding, high-speed machinery where positional stability is critical.
7018 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the standard dimensions: 90mm bore, 140mm OD, 24mm width. |
| CDGA | Specifies a universally matchable (SU) bearing set with a specific contact angle (15°) and preload (Extra light / Class A). This designation ensures precise performance when mounted in pairs or sets. |
| P4A | Indicates an ultra-precision tolerance class with running accuracy superior to ABEC 7/ISO P4. Bore and outside diameter tolerances are held to -0.004mm to 0. |
7018 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The P4A tolerance class and extra light preload ensure minimal runout and exceptional system rigidity, critical for applications requiring extreme positional accuracy. The phenolic resin cage provides excellent dimensional stability and low friction at high speeds.
Optimized Load Capacity: The 15° contact angle design enables the bearing to efficiently support significant combined radial and axial loads. With a dynamic load rating of 17,842 lbf and static load rating of 17,212 lbf, it offers reliable performance under demanding conditions.
High-Speed Capability: The lightweight phenolic cage and precision-ground chrome steel components contribute to a high limiting speed of 15,000 rpm, making it suitable for high-speed spindles and rotors.
Universal Matching: Designated as Universal Matchable (SU), these bearings can be supplied in pre-matched sets (typically 3 bearings) to achieve specific preload and stiffness characteristics without selective mounting, simplifying installation and ensuring consistent performance.
7018 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring ultra-precision.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors & Spindles: Applications demanding low vibration and high rotational accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical motion control systems.
