7208 ACD/P4ATBTA
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7208 ACD/P4ATBTA
Basic Information
System of measurement
Metric
Weight
1.12 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
54 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
15502 lbf
Radial static load rating
15638 lbf
Limiting speed
41 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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7208 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 7208 ACD/P4ATBTA is a metric system, ultra-precision angular contact ball bearing designed for the most demanding applications. Its core advantage lies in its triplex back-to-back (TBT) matched set configuration, providing exceptional system rigidity and stability. This bearing is engineered to handle combined loads (radial and axial) simultaneously with high accuracy, thanks to its P4A tolerance class and 25° contact angle. The extra light preload (Class A) ensures minimal friction and precise rotational characteristics, making it ideal for high-speed, high-precision spindles and machinery where uncompromising performance is critical.
Model Code Deep Explanation
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing series and size designation (40mm bore, 80mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Ultra-high precision tolerance class, exceeding ABEC 7 standards, with specific running accuracy requirements. |
| TBT | Triplex Back-to-Back arrangement. Three bearings are supplied as a matched set for maximum rigidity. |
| A | Specifies the Extra Light Preload applied to the matched set. |
7208 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- Superior Rigidity and Stability: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system, capable of resisting complex moment loads and maintaining precise shaft positioning under heavy combined loads.
- High-Speed Capability: The lightweight phenolic resin cage and open design facilitate efficient lubrication and cooling, enabling a high limiting speed of 41,000 rpm. The 25° contact angle provides an optimal balance between axial load capacity and speed.
- Ultra-Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This ensures minimal runout and vibration for exceptional rotational accuracy.
- Optimized Load Capacity: With a dynamic load rating of 15,502 lbf and static load rating of 15,638 lbf, this bearing is built for longevity and reliability in demanding applications. The use of high-grade chrome steel for rings and balls ensures durability.
- Pre-Configured Matched Set: Supplied as a set of three bearings, pre-matched for optimal performance. This eliminates the need for selective assembly by the end-user, ensuring consistent preload and simplifying installation.
7208 ACD/P4ATBTA Bearing Typical Application Areas
This high-precision, high-rigidity bearing is specifically designed for advanced machinery, including:
- High-Speed Machine Tool Spindles (e.g., CNC milling, grinding, and jig boring machines)
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Industrial High-Speed Pumps and Compressors
- Advanced Robotics and Automation Equipment
