7208 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7208 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.33 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 123.55
/ each
In Stock
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7208 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7208 ACDGA/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional performance. Its design is optimized to primarily support high axial loads in one direction while also accommodating significant radial loads. Manufactured to the stringent P4A tolerance class, this bearing guarantees superior running accuracy and dimensional stability. The combination of a ceramic ball and phenolic cage contributes to its capability for high-speed operation, reaching limiting speeds up to 41,000 rpm, making it an ideal solution for high-performance machinery.
7208 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 7208 ACDGA/HCP4A provides a detailed technical specification. Below is a breakdown of its components:
- 7208: Basic designation indicating a medium series 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 ball complement and optimized internal geometry for increased load capacity.
- GA: Indicates the bearing is lubricated and part of a Universal Matchable (SU) set. "GA" typically refers to a specific preload and internal clearance group for light preload applications.
- /HC: Denotes the use of Hybrid Ceramic balls, which are lighter and harder than steel, reducing centrifugal force and enabling higher speeds.
- P4A: The tolerance class, specifying extremely tight dimensional and running accuracy tolerances beyond standard ABEC 7 (P4) levels.
7208 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Performance: The hybrid ceramic balls and lightweight phenolic resin cage are central to its high-speed capability. Ceramic balls have lower density, reducing centrifugal forces and friction, while the phenolic cage offers excellent strength and guidance at high rotational speeds.
- Exceptional Rigidity and Precision: Manufactured to a P4A super-precision tolerance, this bearing ensures minimal runout and vibration. This results in superior positional accuracy and system stability, which is critical for machine tool spindles and other precision equipment.
- Optimized Load Capacity: The 25° contact angle and high ball complement (D) design are engineered to handle substantial axial loads and combined (radial and axial) loads efficiently.
- Universal Matching: As a Universal Matchable (SU) bearing, it can be mounted in various preloaded arrangements (e.g., back-to-back, face-to-face) with other bearings from the same lot to achieve the desired system rigidity without selective matching.
7208 ACDGA/HCP4A Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Where extreme accuracy and minimal runout are paramount.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Aerospace and Defense Systems: Including gyroscopes, radar systems, and auxiliary power units.
- Medical Equipment: Such as high-speed dental handpieces and laboratory centrifuges.
