7208 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7208 CD/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
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
7605 lbf
Radial static load rating
5400 lbf
Limiting speed
34 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:
$ 259.1
/ each
In Stock
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7208 CD/HCP4A Bearing Product Overview & Core Advantages
The 7208 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 15° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stiffness and precise shaft positioning. Manufactured to P4 (ABEC-7) tolerance class, it guarantees extremely tight dimensional and running accuracy. The combination of a phenolic cage and ceramic balls contributes to lower friction, higher limiting speeds, and extended service life, making it an ideal solution for high-performance machinery.
7208 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7208 CD/HCP4A provides detailed technical specifications:
- 7208: Basic series designation indicating a 40mm bore, 80mm OD, and 18mm width.
- C: Denotes a 15° contact angle.
- D: Indicates the bearing is supplied with a preload for enhanced rigidity.
- HC: Signifies the use of Hybrid Ceramic components (Ceramic balls with steel rings).
- P4: Specifies the tolerance class equivalent to ABEC-7, ensuring ultra-precision.
- A: Indicates a 30° contact angle (Note: This model uses a 15° angle per spec, the "A" may refer to a specific internal design variant).
7208 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The preloaded design and P4 tolerance class eliminate internal clearance, providing maximum system stiffness and exceptional running accuracy for precise shaft control.
- Enhanced High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls reduce centrifugal forces, allowing for a high limiting speed of 34,000 rpm.
- Superior Durability and Temperature Resistance: Ceramic balls are harder and more wear-resistant than steel, and the phenolic cage can withstand higher operational temperatures, contributing to a longer service life.
- Optimized Load Capacity: The 15° contact angle is optimized to handle combined loads, with a significant capacity for thrust loads in one direction, supported by a dynamic load rating of 7605 lbf and a static load rating of 5400 lbf.
7208 CD/HCP4A Bearing Typical Application Areas
This bearing is designed for high-performance applications where precision, speed, and rigidity are critical. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In arm joints and high-accuracy servo motors.
- High-Frequency Motors and Spindles: Used in PCB drilling and dental handpieces.
- Aerospace and Defense Systems: In gyroscopes, navigation instruments, and auxiliary power units.
