7208 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7208 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.33 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.007mm 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° to 110 °C
Radial dynamic load rating
7178 lbf
Radial static load rating
5130 lbf
Limiting speed
32 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 108.94
/ each
In Stock
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7208 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7208 ACD/HCP4A is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. Engineered with a 25° contact angle and P4 (ABEC-7) tolerance class, it delivers superior running accuracy and rigidity. Its key advantage lies in its ability to accommodate combined radial and axial loads simultaneously. The combination of a ceramic ball material and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal choice for high-reliability, high-performance systems.
7208 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7208 ACD/HCP4A is decoded as follows:
- 7208: Basic series designation for a metric angular contact ball bearing with a 40mm bore and 80mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a high rigidity internal design.
- HCP4A: A composite suffix indicating:
- HC: Hybrid Ceramic balls (Ceramic balls with steel rings).
- P4: P4 (ABEC-7) Tolerance Class, denoting very high precision.
- A: Indicates a specific internal clearance or preload condition.
7208 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and optimized internal geometry provide high rigidity, enabling the bearing to effectively support combined radial and axial loads.
- Superior High-Speed Performance: The use of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, allowing for a high limiting speed of 32,000 rpm.
- Enhanced Durability and Temperature Resistance: Ceramic balls offer superior wear resistance, lower thermal expansion, and can operate effectively within a temperature range of -30°C to 110°C.
- Precision Engineering: Manufactured to P4 tolerance, this bearing ensures minimal runout and vibration, which is critical for applications requiring high positional accuracy.
7208 ACD/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for demanding applications in:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency Motors and Spindles
- Aerospace and Defense Systems
- Medical and Dental Equipment
