7018 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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7018 ACB/HCP4A Bearing Product Overview & Core Advantages
The 7018 ACB/HCP4A is a high-precision, single-row angular contact ball bearing engineered for demanding applications. It is characterized by its P4 (ABEC-7) tolerance class, ensuring exceptional running accuracy. A key feature is its ceramic ball material (Silicon Nitride), which significantly reduces centrifugal forces, lowers operating temperatures, and enables superior high-speed performance. With a 25° contact angle, it is optimally designed to support combined loads, handling substantial axial loads in one direction alongside radial loads. The phenolic cage and preload availability contribute to its high rigidity and smooth operation, making it an ideal choice for high-reliability, precision machinery.
7018 ACB/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). |
| ACB | Angular Contact Bearing with a 25° contact angle. |
| HCP4A | A hybrid bearing designation: HC indicates Hybrid Ceramic (steel rings with ceramic balls), and P4A specifies a P4 tolerance class with specific internal geometry and preload for high-precision applications. |
7018 ACB/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls reduces weight, minimizes friction, and provides electrical insulation. This construction is fundamental to achieving the high limiting speed of 20,000 rpm.
- High Rigidity and Precision: The P4 tolerance and availability of preload ensure minimal axial and radial runout, resulting in exceptional positional accuracy and high rigidity for the supported shaft.
- Superior Load Capacity: The 25° contact angle and robust design provide a high radial dynamic load rating of 6075 lbf and a radial static load rating of 5310 lbf, making it capable of handling significant combined loads.
- Optimized High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls reduce centrifugal forces, allowing for smoother operation at extreme speeds and within a wide temperature range (-30° to 110 °C).
7018 ACB/HCP4A Bearing Typical Application Areas
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Aerospace and Defense Actuators
- Semiconductor Manufacturing Equipment
