7018 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
2.32 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
15.875 mm
Ball quantity
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
27225 lbf
Radial static load rating
32175 lbf
Limiting speed
16 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 515.75
/ each
In Stock
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7018 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7018 ACD/P4ADBB is a precision duplex angular contact ball bearing set designed for demanding applications requiring exceptional rigidity and running accuracy. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, ensuring high system stiffness and minimal axial and radial runout. It excels at handling combined loads (radial and axial) simultaneously and is optimized for high-precision, high-rigidity applications such as machine tool spindles.
7018 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a specific 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a high-precision tolerance class exceeding ABEC 7 (P4), with additional running accuracy requirements for the assembled set. |
| DB | Signifies a Duplex Back-to-Back matched pair. This arrangement provides high moment rigidity and is ideal for applications with overturning moments. |
7018 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The back-to-back duplex mounting and light preload create an exceptionally rigid bearing system that minimizes deflection under load, crucial for maintaining precision in machining operations. The P4A tolerance class guarantees superior running accuracy.
- Superior Load Capacity: With a 25° contact angle, this bearing is engineered to handle significant combined radial and axial loads efficiently. The dynamic and static load ratings ensure long-term reliability under strenuous conditions.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at high speeds, with a limiting speed of 16,000 rpm. The open design allows for efficient lubrication management.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, this bearing offers high hardness, wear resistance, and a long operational life.
7018 ACD/P4ADBB Bearing Typical Application Areas
This precision duplex bearing is ideally suited for high-performance machinery where accuracy and rigidity are paramount. Key applications include:
- Machine Tool Spindles (e.g., milling, grinding, and turning centers)
- High-Frequency Machining Heads
- Precision Grinding Spindles
- Industrial Pumps and Compressors requiring high shaft stability
