708 ACD/P4A
Miniature Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
708 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.012 kg
Tolerance class
P4 (ABEC-7)
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
-0.005mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
9
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
718 lbf
Radial static load rating
302 lbf
Limiting speed
120 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 71.17
/ each
In Stock
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708 ACD/P4A Bearing Product Overview & Core Advantages
The 708 ACD/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and exceptional rotational accuracy. Engineered to P4 (ABEC-7) tolerance class, this bearing excels at accommodating combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its 25° contact angle optimizes it for high rigidity and thrust capacity. Pre-lubricated and featuring an open design with a phenolic cage, it is engineered for high-speed operation up to 120,000 rpm, making it an ideal component for precision spindles and high-performance machinery.
708 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 708 ACD/P4A provides detailed technical specifications through its suffixes:
- 708: Basic bearing series designation.
- ACD: Indicates a 25° contact angle and a specific internal design optimized for high precision and matched mounting.
- P4: Denotes the tolerance class, equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy.
- A: Signifies that the bearing is supplied with a specific preload for enhanced rigidity and precise rotational performance.
708 ACD/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class with a 25° contact angle, this bearing provides superior running accuracy and system stiffness, minimizing deflection under load.
- Optimized for Combined Loads: The angular contact design efficiently supports combined radial and axial loads in one direction, a critical requirement for spindle applications.
- High-Speed Capability: The lightweight phenolic resin cage ensures stability and reduced centrifugal forces, enabling reliable operation at the limiting speed of 120,000 rpm.
- Preload & Precision: The "A" suffix indicates the bearing is supplied with a preload, which eliminates internal clearance for greater shaft positioning accuracy and reduced vibration.
- Material Integrity: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and consistent performance within a temperature range of -30°C to 110°C.
708 ACD/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 Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors: Spindles for PCB drilling and small precision motors.
- Robotics: High-accuracy joints and arm assemblies.
