7018 CD/P4ADGC
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7018 CD/P4ADGC Bearing Product Overview & Core Advantages
The 7018 CD/P4ADGC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined radial and axial loads simultaneously. Its P4A tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other high-precision, high-reliability machinery where minimal runout and vibration are critical.
7018 CD/P4ADGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the standard boundary dimensions (90mm bore, 140mm OD, 48mm width). |
| CD | Specifies a 15° contact angle and indicates the bearing is part of a universally matchable (SU) pair. This allows two bearings to be mounted in any combination (back-to-back, face-to-face, or tandem) to achieve the required stiffness and load capacity. |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards. This ensures extremely tight dimensional and running accuracy for superior performance in demanding applications. |
| DGC | Indicates a Moderate preload (Class C) is applied to the bearing pair. This preload eliminates internal clearance, increasing system rigidity and improving rotational accuracy at the expense of a slightly lower limiting speed. |
7018 CD/P4ADGC Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design and universal matching (SU) capability allow for configurations that provide high resistance to moment loads. The 15° contact angle and moderate preload (C) work together to deliver exceptional system stiffness, crucial for minimizing deflection under heavy combined loads.
Precision & High-Speed Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal runout. The lightweight, durable phenolic resin cage ensures stable guidance of the balls, reducing centrifugal forces and friction, which contributes to reliable operation at high rotational speeds.
Optimized Material Selection: Constructed from high-grade chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance. The phenolic cage is suitable for the specified temperature range and high-speed operation.
7018 CD/P4ADGC Bearing Typical Application Areas
The 7018 CD/P4ADGC is predominantly used in high-performance machinery where precision, speed, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and imaging device rotors.
