708 CEGB/P4A
Miniature Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
708 CEGB/P4A
Basic Information
System of measurement
Metric
Weight
0.012 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
22 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
8
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
526 lbf
Radial static load rating
180 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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708 CEGB/P4A Bearing Product Overview & Core Advantages
The 708 CEGB/P4A is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high-speed performance. As a single bearing from a Universal Matchable (SU) pair, it is engineered to handle combined radial and axial loads simultaneously. Its defining characteristics include a P4A tolerance class for superior running accuracy, a light preload (Class B) for reduced friction and heat generation, and a phenolic cage optimized for high-speed operation. This bearing is pre-lubricated and ready for installation, offering reliable performance in demanding, high-precision environments.
708 CEGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 708 CEGB | Basic bearing designation for a metric, angular contact ball bearing with specific internal design. |
| P4A | Indicates a high-precision tolerance class, signifying extremely tight dimensional and running accuracy tolerances superior to ABEC 7. |
708 CEGB/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration, providing stable and precise shaft guidance. The 15° contact angle offers an optimal balance between radial load capacity and axial load capacity.
- Optimized for High Speeds: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for a limiting speed of 100,000 rpm. This makes it ideal for very high-speed spindle applications.
- Superior Load Capacity: The bearing's internal geometry and chrome steel construction provide a dynamic load rating of 526 lbf and a static load rating of 180 lbf, enabling it to handle significant combined loads.
- Universal Matching Design (SU): As a universal matchable bearing, it can be paired with another identical bearing in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to create a preloaded set, enhancing system rigidity and performance.
- Pre-lubricated & Ready-to-Use: The bearing comes pre-lubricated, simplifying installation and ensuring immediate, reliable operation within its specified temperature range.
708 CEGB/P4A Bearing Typical Application Areas
This high-precision, high-speed angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes.
- Precision Instruments: Measuring devices, optical scanners, and laboratory equipment.
- High-Speed Motors: Spindles for PCB drilling, dental handpieces, and small turbochargers.
- Robotics: Joints and actuators requiring high accuracy and responsiveness.
