7018 ACE/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7018 ACE/HCP4ADBB
Basic Information
System of measurement
Metric
Weight
2.22 kg
Tolerance class
P4A
Seal type
Open
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
48 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
12442 lbf
Radial static load rating
13500 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7018 ACE/HCP4ADBB Bearing Product Overview & Core Advantages
The 7018 ACE/HCP4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, ensuring optimal performance under combined radial and axial loads. Featuring a 25° contact angle and ceramic balls, it delivers superior high-speed capability, reduced friction, and extended service life, making it ideal for high-precision, high-reliability machinery.
7018 ACE/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACE | Specific internal design and clearance for optimized performance. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls for enhanced speed and durability. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy. |
| DBB | Duplex Back-to-Back: A matched set of two bearings arranged back-to-back to withstand moment loads and provide high rigidity. |
7018 ACE/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide effective spread, significantly increasing system rigidity and stability against overturning moments.
- Superior Speed & Thermal Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a phenolic resin cage enables very high limiting speeds (15,000 rpm) with excellent thermal stability and lower operating temperatures.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle significant combined loads (radial and axial), with a high dynamic load rating of 12,442 lbf.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring predictable and precise performance in the application.
7018 ACE/HCP4ADBB Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high positional accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and other critical rotating assemblies.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational accuracy are required.
