S7018 ACD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7018 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
2.33 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
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
15 X 1000 rpm
Lubrication
Grease
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
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In Stock
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S7018 ACD/P4ADBB Bearing Product Overview & Core Advantages
The S7018 ACD/P4ADBB is a precision duplex pair of double row angular contact ball bearings, pre-configured in a Back-to-Back (DB) arrangement. This design is engineered to provide exceptional high rigidity and stability, capable of supporting combined loads (radial and axial loads) simultaneously from both directions. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, making it ideal for high-precision, high-reliability applications requiring minimal runout and smooth operation.
S7018 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7018 | Basic bearing series, indicating a high-precision, double row angular contact ball bearing with a 90mm bore. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Indicates a Duplex pair of two bearings supplied as a set. |
| P4A | The tolerance class, signifying ultra-precision dimensional and running accuracy exceeding ABEC 7/ISO P4 standards. |
| DBB | Specifies the Duplex Back-to-Back arrangement, providing high moment rigidity. |
S7018 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a large spread between load centers, significantly increasing the bearing set's resistance to moment loads and ensuring high rigidity for precise shaft positioning.
- Superior Load Capacity: The double row design and 25° contact angle enable high radial dynamic load rating of 27,225 lbf and excellent capacity for combined loads, including bidirectional axial thrust.
- Precision & High-Speed Performance: The P4A tolerance class guarantees minimal vibration and noise. The lightweight phenolic cage and optimized internal geometry contribute to stable operation at high speeds, with a limiting speed of 15,000 rpm.
- Ready-to-Install & Long-Lasting: The bearings are sealed and pre-lubricated with grease, offering protection against contamination and providing a long service life within the specified temperature range of -30°C to 110°C without immediate need for re-lubrication.
S7018 ACD/P4ADBB Bearing Typical Application Areas
This precision bearing set is ideally suited for demanding applications where high rigidity, accuracy, and speed are critical. Key industries and machinery include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Spindles
- Precision Industrial Pumps and Compressors
- Robotic Arms and Precision Gearboxes
- Advanced Medical and Laboratory Equipment
