7018 ACDGD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACDGD/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
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7018 ACDGD/P4A Bearing Product Overview & Core Advantages
The 7018 ACDGD/P4A is a single-row angular contact ball bearing engineered for applications demanding high rigidity and exceptional precision. Designed to accommodate primarily axial loads in one direction, combined with radial loads, it features a 25° contact angle and a Heavy preload (Class D) for maximum system stiffness and minimal deflection under load. Manufactured to P4A tolerance class with Universal Matchable (SU) designation, it is ideal for high-precision, high-speed spindles and other critical machinery requiring superior running accuracy and dimensional stability.
7018 ACDGD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, defining the boundary dimensions: 90mm bore, 140mm outside diameter, 24mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Heavy preload (Class D). |
| GD | Grease-filled with a specific quantity and type. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
7018 ACDGD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The combination of a 25° contact angle and a Heavy preload (Class D) provides superior axial and radial stiffness, minimizing operational deflection and ensuring high positional accuracy in demanding applications.
- Optimized Internal Geometry: With a ball diameter of 15.875 mm and 20 balls, the bearing is designed for high load-carrying capacity. The phenolic cage ensures low friction, excellent high-speed capability, and reduced weight.
- Premium Materials & Lubrication: Constructed from chrome steel for both rings and balls, offering high durability and wear resistance. The bearing is pre-lubricated (GD suffix) for immediate operation and reliable performance within its specified temperature range.
- Ultra-Precise Performance: The P4A tolerance class guarantees minimal runout and vibration, which is critical for applications like machine tool spindles. The Universal Matchable (SU) feature allows for precise mounting in sets of three to handle complex load configurations.
7018 ACDGD/P4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring high axial stiffness.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
- Medical Equipment: High-speed dental handpieces and imaging devices.
