7018 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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7018 CB/HCP4A Bearing Product Overview & Core Advantages
The 7018 CB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to a P4 (ABEC-7) tolerance class, it offers superior running accuracy and rotational stability. Its key advantage lies in its ability to accommodate combined loads—simultaneously handling substantial radial loads and axial loads in one direction. The use of ceramic balls and a phenolic cage contributes to its classification as a high-speed bearing, enabling operation at high rotational speeds with reduced friction and heat generation. This combination of precision, speed capability, and load capacity makes it an ideal solution for high-reliability, high-performance systems.
7018 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the bearing dimensions (90mm bore, 140mm OD, 24mm width). |
| CB | Specific internal design and clearance, indicating a matched preload for optimal stiffness and positioning accuracy. |
| HCP4A | Hybrid Ceramic, P4 tolerance, and specific internal design. HC denotes Hybrid Ceramic construction (steel rings with ceramic balls). P4 specifies the precision tolerance class (ABEC-7). |
7018 CB/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to a P4 tolerance class, this bearing ensures minimal runout and superior rotational accuracy. The CB preload provides enhanced system stiffness, critical for applications requiring precise shaft positioning.
- Superior High-Speed Performance: The hybrid ceramic design, featuring silicon nitride balls, significantly reduces centrifugal forces and friction. Combined with the lightweight phenolic resin cage, this allows for a high limiting speed of 24,000 rpm, making it an exemplary high-speed bearing.
- Extended Service Life and Reliability: Ceramic balls are harder, lighter, and offer superior corrosion resistance compared to steel. They also exhibit lower thermal expansion, maintaining stable preload and performance across the operating temperature range of -30°C to 110°C.
- Optimized Load Capacity: With a 15° contact angle, the bearing is engineered to efficiently support combined loads, offering a dynamic load rating of 6548 lbf and a static load rating of 5625 lbf.
7018 CB/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles: Used in CNC machining and PCB drilling equipment.
- Precision Instrumentation: Applications in medical devices, optical scanners, and coordinate measuring machines.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and other critical rotating assemblies.
