S7208 ACDGC/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S7208 ACDGC/HCP4A
Basic Information
System of measurement
Metric
Weight
0.33 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
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
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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S7208 ACDGC/HCP4A Bearing Product Overview & Core Advantages
The S7208 ACDGC/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and reliability. This single bearing is part of a Universal Matchable (SU) pair, enabling precise preload configuration when mounted with its matched counterpart. Its defining characteristics include a 25° contact angle and Moderate (Class C) preload for superior high-rigidity support. The combination of a ceramic ball and phenolic cage facilitates outstanding high-speed performance, making it capable of handling combined loads (radial and axial) simultaneously in high-velocity environments.
S7208 ACDGC/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Implication |
|---|---|---|
| ACD | Angular Contact Design, 25° contact angle | Optimized for handling significant axial loads in one direction and radial loads. |
| GC | Moderate Preload (Class C) | Provides consistent running accuracy and enhanced system rigidity. |
| HC | Hybrid Ceramic (Silicon Nitride Balls) | Reduces centrifugal forces, lowers friction, and enables higher limiting speeds. |
| P4A | High Precision Tolerance Class | Guarantees extremely tight dimensional and running accuracy for critical applications. |
S7208 ACDGC/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and moderate preload work in tandem to provide exceptional stiffness, minimizing deflection under combined loads. This ensures precise rotational accuracy and longevity in high-stress conditions.
- Superior High-Speed Performance: The use of ceramic balls significantly reduces weight and centrifugal force, while the phenolic cage offers excellent strength-to-weight ratio and smooth operation. This synergy allows the bearing to achieve a remarkable limiting speed of 41,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing features extremely tight bore, outside diameter, and width tolerances, ensuring predictable performance and ease of integration into high-precision assemblies.
- Sealed & Lubricated for Life: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is designed for maintenance-free operation within its specified temperature range of -30°C to 110°C.
S7208 ACDGC/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where speed, precision, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In robot arm joints and spindle drives requiring high accuracy and responsiveness.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, radar systems, and other critical rotating assemblies.
