7018 CDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7018 CDGB/P4A Bearing Product Overview & Core Advantages
The 7018 CDGB/P4A is a single row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional running accuracy. Operating under the stringent P4A tolerance class and featuring a Universal Matchable (SU) designation, this bearing is designed for universal matching in sets, enabling simplified assembly and optimal preload control. Its 15° contact angle and light preload (Class B) make it ideally suited for managing combined loads while achieving superior high-speed performance.
7018 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the boundary dimensions: 90mm bore, 140mm OD, 24mm width. |
| C | Designates a 15° contact angle, optimized for high-speed applications and combined radial and axial loads. |
| DGB | Indicates a Universal Matchable (SU) bearing. Two bearings can be mounted in any combination (face-to-face, back-to-back, or tandem) to achieve the desired rigidity and preload. |
| P4A | Specifies the tolerance class, representing ultra-precision dimensional and running accuracy standards superior to ABEC-7. |
7018 CDGB/P4A Bearing Structural Features & Performance Benefits
Precision Engineering: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring extreme rotational accuracy.
High-Speed Capability: The 15° contact angle and phenolic resin cage contribute to low friction and heat generation, supporting a limiting speed of 15,000 rpm. The open design facilitates efficient lubrication management.
Superior Rigidity & Load Capacity: The Universal Matchable (SU) design allows for the creation of preloaded bearing sets. When mounted in pairs, these sets provide significantly increased system rigidity and can handle substantial combined radial and axial loads (Dynamic Load Rating: 17,842 lbf, Static Load Rating: 17,212 lbf).
Optimized Material Selection: Components made from chrome steel offer high hardness and durability, while the phenolic cage provides excellent strength-to-weight ratio and smooth operation at high speeds.
7018 CDGB/P4A Bearing Typical Application Areas
The 7018 CDGB/P4A is a cornerstone component in high-performance machinery where precision and speed are paramount. Its primary applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring maximum rigidity and running accuracy.
- Precision Grinding Spindles: Where minimal vibration and thermal growth are critical for surface finish quality.
- High-Frequency Motors and Spindles: Used in applications demanding rapid acceleration and deceleration.
- Aerospace & Defense Systems: Including gyroscopes, radar equipment, and other precision instruments.
