7018 ACD/P4ADT
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACD/P4ADT
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 Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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7018 ACD/P4ADT Bearing Product Overview & Core Advantages
The 7018 ACD/P4ADT is a precision duplex tandem angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This P4A tolerance class bearing is preloaded and supplied as a matched set, enabling it to handle combined loads (radial and axial) efficiently in a single direction. Its compact design and high rigidity make it ideal for high-precision, high-reliability machinery where minimal deflection under load is critical.
7018 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Standard bearing series with 90mm bore, 140mm OD, 48mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Tandem (DT) arrangement. Two bearings are matched and preloaded to share the axial load in one direction. |
| P4A | High precision tolerance class, equivalent to ABEC 7, with enhanced running accuracy. |
| DT | Duplex Tandem, confirming the matched set arrangement. |
7018 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement combines two bearings to provide superior axial stiffness and a high thrust load capacity in one direction, making it resistant to operational deflection.
- Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures smooth, precise rotation with minimal runout, which is critical for high-speed spindles.
- Optimized High-Speed Operation: The lightweight phenolic resin cage and precision-ground chrome steel components reduce centrifugal forces and friction, supporting a high limiting speed of 16,000 rpm.
- Durability & Preload: The bearings are supplied as a preloaded matched set, eliminating internal clearance and ensuring immediate, precise performance upon installation without requiring further adjustment.
7018 ACD/P4ADT Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Robotic Drives and Rotary Axes
