7018 CD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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7018 CD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 7018 CD/HCP4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and speed performance. This bearing is supplied as a matched triplex set in a back-to-back (TBT) arrangement, providing superior stability and the ability to handle combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it guarantees ultra-precise running accuracy. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal choice for high-reliability, high-performance systems.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series and size designation (90mm bore, 140mm OD). |
| CD | Indicates a matched set of two bearings with specific preload and axial/radial clearance. |
| HC | Signifies the use of Hybrid Ceramic balls (steel rings with ceramic balls). |
| P4A | Denotes a super-precision tolerance class, with running accuracy exceeding ABEC 7/ISO P4. |
| TBT | Specifies the Triplex Back-to-Back arrangement of the three bearings in the set. |
| A | Indicates an Extra Light preload class. |
7018 CD/HCP4ATBTA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The triplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and manages complex combined loads. This configuration significantly increases the overall system's stability and load-carrying capacity.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 15,000 rpm. This makes the bearing suitable for very high-speed spindles.
Reduced Friction & Heat Generation: Ceramic balls have a lower coefficient of thermal expansion and are harder than steel, leading to less friction, lower operating temperatures, and reduced risk of thermal seizure under high-speed conditions.
Precision & Longevity: Manufactured to P4A tolerance class with a 15° contact angle, this bearing ensures minimal runout and vibration, which is critical for precision machining and extended bearing service life.
7018 CD/HCP4ATBTA Bearing Typical Application Areas
The 7018 CD/HCP4ATBTA is engineered for the most demanding high-precision and high-speed machinery. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for electric motors operating at very high RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
