7018 ACD/P4ATBTA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7018 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
3.47 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
72 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
36675 lbf
Radial static load rating
48600 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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
In Stock
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7018 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 7018 ACD/P4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set provides superior stability and load-handling capabilities. Engineered with a P4A tolerance class and an extra light preload (Class A), it delivers outstanding running accuracy and is optimized to handle combined loads efficiently. Its open design, phenolic cage, and pre-lubrication make it suitable for high-speed operation and precision machinery where reliability is paramount.
7018 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Basic bearing series, indicating dimensions: 90mm bore, 140mm OD, 72mm width. |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | High Precision Tolerance Class, exceeding ABEC-7/ISO P4 standards for exceptional dimensional accuracy. |
| TBTA | Specifies a Triplex Back-to-Back Arrangement of three matched bearings. |
7018 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, ensuring precise alignment and minimal runout under heavy combined loads.
- Superior Load Capacity: With a radial dynamic load rating of 36,675 lbf and a static load rating of 48,600 lbf, this bearing set is built to handle significant radial and thrust loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the 25° contact angle and precision grinding contribute to a high limiting speed of 15,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with bore and OD tolerances of -0.004mm to 0, guaranteeing smooth, quiet operation and superior positional accuracy in high-precision spindles.
7018 ACD/P4ATBTA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery requiring maximum rigidity and speed, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Machining Spindles
- Precision Grinding Equipment
- Industrial Pumps and Compressors
- Robotic Arm Rotary Joints
