7018 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACDGA/P4A
Basic Information
System of measurement
Metric
Weight
1.16 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
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
16672 lbf
Radial static load rating
16200 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 230.56
/ each
In Stock
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7018 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7018 ACDGA/P4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional operational reliability. Operating under the stringent P4A tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads. Its extra light preload (Class A) ensures minimal friction and precise running accuracy, making it ideal for high-speed spindles and other precision machinery where rotational stability is critical. The bearing is universally matchable (SU designation), allowing for flexible mounting configurations in sets to support complex load requirements.
7018 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 7018 | Basic bearing series, indicating a metric bore diameter of 90mm and outside diameter of 140mm. |
| AC | Angular Contact design with a 25° contact angle, optimized for combined axial and radial loads. |
| DGA | Indicates a specific internal design and manufacturing process for universal matching (SU). "GA" typically refers to a specific internal clearance and preload grouping for precision matching. |
| P4A | The tolerance class, denoting extremely high precision levels for dimensional and running accuracy beyond standard ABEC 7/ISO P4. |
7018 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High-Precision Construction: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width. This ensures exceptional running accuracy and system stability in demanding applications.
- Optimized Load Capacity: The 25° contact angle and robust chrome steel construction provide excellent capacity for axial loads in one direction and combined (axial and radial) loads.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload minimizes friction, collectively enabling a high limiting speed of 15,000 rpm.
- Universal Matching (SU): This bearing is designed for universal matching, meaning individual bearings can be mounted in any combination (back-to-back, face-to-face, or tandem) to create a matched set that meets specific application requirements for rigidity and load distribution.
- Material Integrity: Components made from high-grade chrome steel offer high hardness, wear resistance, and a long operational life under demanding conditions.
7018 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring ultra-precision and rigidity.
- Precision Grinding Spindles: Applications where minimal runout and thermal stability are paramount.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring the highest levels of accuracy and reliability.
