7208 ACDGB/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7208 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.37 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
18 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
7178 lbf
Radial static load rating
5130 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 87.63
/ each
In Stock
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7208 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7208 ACDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a single bearing from a universally matchable (SU) set, it excels in handling combined loads, accommodating both high radial loads and substantial axial loads in one direction. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery. The light preload (Class B) minimizes deflection under operational forces, enhancing system stability and performance.
7208 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7208 | Basic bearing designation indicating a 40 mm bore and 80 mm outside diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| DGB | Duplex arrangement, Back-to-Back mounting configuration for high rigidity. |
| P4A | Super Precision tolerance class for extremely high running accuracy and dimensional stability. |
7208 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The back-to-back (DGB) duplex design creates a rigid bearing system capable of supporting significant combined radial and axial loads. The 25° contact angle is optimized for high axial load carrying capacity.
- Superior High-Speed Performance: The lightweight phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 41,000 rpm. The bearing is pre-lubricated for immediate high-speed operation.
- Exceptional Precision: Manufactured to P4A super precision standards with tight dimensional tolerances on the bore, outside diameter, and width. This guarantees minimal runout and vibration for ultra-precise applications.
- Optimized Internal Geometry: Features 14 precision balls made of chrome steel with a diameter of 11.112 mm, ensuring smooth operation and long service life under high dynamic loads (7178 lbf).
7208 ACDGB/P4A Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace & Defense Systems: Gyroscopes, radar platforms, and navigation instruments.
