7018 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7018 ACE/HCP4A Bearing Product Overview & Core Advantages
The 7018 ACE/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its key advantages stem from its P4 (ABEC-7) tolerance class, ceramic ball construction, and availability with preload, making it an ideal solution for high-speed spindles and other precision machinery where minimal runout and high operational stability are critical.
7018 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the standard boundary dimensions (90mm bore, 140mm OD, 24mm width). |
| ACE | Internal design suffix. Typically indicates a 25° contact angle and optimized internal geometry for high-speed, high-precision performance. |
| HC | Hybrid Ceramic. Denotes the use of ceramic balls (typically Silicon Nitride, Si3N4) with steel rings. |
| P4A | Precision Class. Equivalent to ABEC-7, specifying extremely tight dimensional and running accuracy tolerances. |
7018 ACE/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions (up to 22,000 rpm). Ceramic balls are also electrically insulating and highly resistant to wear.
High Rigidity & Load Capacity: The 25° contact angle is optimized to handle substantial axial loads in one direction while maintaining excellent radial load capacity. The availability of preload eliminates internal clearance, maximizing system stiffness and rotational accuracy.
Precision & High-Speed Performance: Manufactured to P4 tolerance class, this bearing ensures minimal vibration and precise shaft positioning. The lightweight phenolic resin cage contributes to lower inertia and smooth operation at the limiting speed.
Open Design & Lubrication: The open seal type allows for customized lubrication schemes to match specific application needs, optimizing performance for the specified temperature range of -30°C to 110°C.
7018 ACE/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Motors & Spindles: Where low friction, high speed, and long service life are paramount.
