S7018 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7018 ACEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.16 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7605 lbf
Radial static load rating
6750 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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S7018 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The S7018 ACEGA/HCP4A is a super-precision angular contact ball bearing engineered for the most demanding applications. Its single bearing configuration with Universal Matchable (SU) designation allows for simplified, high-rigidity mounting in pairs. This bearing excels in environments requiring exceptional rotational accuracy, high-speed capability, and reliable performance under combined loads. The use of ceramic balls and a phenolic cage significantly enhances its high-speed performance and reduces operational friction, making it an ideal choice for advanced machinery.
S7018 ACEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7018 | Bearing series and size designation (90mm bore, 140mm OD, 24mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| EGA | Pre-greased with a specific high-performance lubricant suitable for the specified temperature range. |
| HC | Hybrid Ceramic construction, featuring ceramic balls and steel rings. |
| P4A | Indicates a super-precision tolerance class (exceeding ABEC 7), ensuring minimal runout and superior running accuracy. |
S7018 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls reduces centrifugal forces, lowers operating temperature, and enables a limiting speed of 15,000 rpm. This design also offers superior resistance to electrical erosion and operates effectively with minimal lubrication.
- High Rigidity & Load Capacity: The 25° contact angle and robust internal geometry provide excellent support for combined radial and axial loads, with a dynamic load rating of 7605 lbf and a static load rating of 6750 lbf.
- Optimized High-Speed Cage: The lightweight, durable phenolic resin cage ensures stable operation at high speeds, contributing to the bearing's exceptional rotational precision and low vibration levels.
- Sealed & Pre-Lubricated: The sealed design protects against contamination, while the factory-applied grease lubrication provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S7018 ACEGA/HCP4A Bearing Typical Application Areas
This super-precision bearing is ideally suited for high-performance machinery where speed, accuracy, and reliability are paramount. Key applications include:
- Machine Tool Spindles for high-speed milling, grinding, and turning centers.
- High-Frequency Motors and Spindles used in PCB drilling and semiconductor manufacturing.
- Precision Robotics and automated guidance systems.
- Advanced Aerospace & Defense Systems requiring high reliability and performance.
