S7208 ACD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7208 ACD/HCP4ADBA
Basic Information
System of measurement
Metric
Weight
0.66 kg
Tolerance class
P4A
Seal type
Sealed
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
36 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
11700 lbf
Radial static load rating
10238 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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
In Stock
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S7208 ACD/HCP4ADBA Bearing Product Overview & Core Advantages
The S7208 ACD/HCP4ADBA is a high-precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and rotational accuracy. This matched back-to-back (DB) arrangement provides superior stability and is preloaded to Extra Light / Class A specifications, ensuring minimal axial and radial runout. Engineered with ceramic balls and a phenolic cage, it delivers outstanding high-speed performance and the capability to handle combined radial and axial loads simultaneously. Its sealed design and pre-lubrication offer reliable, long-term operation in precision machinery.
S7208 ACD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7208 | Basic bearing series, indicating a 40mm bore, 80mm OD, and angular contact design. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings supplied as a matched set). |
| HCP4A | High-performance specification: P4A tolerance class for extreme precision, Ceramic balls (Hybrid), and Phenolic cage. |
| DBA | Matched arrangement in Back-to-Back (DB) configuration with Class A preload. |
S7208 ACD/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and maintains shaft positioning under heavy combined loads.
- Superior High-Speed Capability: The combination of lightweight ceramic balls and a phenolic cage reduces centrifugal forces and friction, enabling a high limiting speed of 41,000 rpm.
- Exceptional Precision: Manufactured to ABEC 7 / P4A tolerance class with tight bore and outside diameter tolerances, this bearing ensures minimal vibration and supreme running accuracy.
- Reduced Maintenance: The sealed design and factory-applied grease lubrication protect against contamination and provide long-lasting, maintenance-free operation within a temperature range of -30°C to 110°C.
- Optimized Load Capacity: With a dynamic load rating of 11,700 lbf and static load rating of 10,238 lbf, it is built to handle significant radial and axial forces.
S7208 ACD/HCP4ADBA Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics and Automation Arms
- High-Frequency Spindles for PCB drilling and routing
- Medical Equipment such as dental handpieces and centrifuges
- Aerospace Actuators and Control Systems
