7208 CDGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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7208 CDGB/HCP4A Bearing Product Overview & Core Advantages
The 7208 CDGB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered as a single bearing with a Universal Matchable (SU) designation, it can be precisely paired with other bearings to form optimized sets. Its core advantages include the ability to handle combined loads (radial and axial), superior high-speed capabilities enabled by its ceramic balls and phenolic cage, and outstanding operational reliability due to its P4A super-precision tolerance and light preload. This makes it an ideal component for high-rigidity, high-rotation accuracy systems.
7208 CDGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 7208: Basic series code denoting a metric angular contact ball bearing with a 40mm bore and 80mm outside diameter.
- C: Indicates a 15° contact angle, optimized for high-speed operation.
- D: Signifies a light preload (Class B), which enhances rigidity and minimizes runout.
- GB: Specifies the use of Ceramic (Si3N4) balls, which reduce centrifugal forces, lower operating temperature, and enable higher limiting speeds.
- HC: Denotes a Phenolic (resin) cage, which offers excellent strength-to-weight ratio and is ideal for high-speed applications.
- P4A: Identifies the tolerance class, which is a super-precision grade with extremely tight dimensional and running accuracy tolerances.
7208 CDGB/HCP4A Bearing Structural Features & Performance Benefits
High-Speed Performance: The combination of ceramic balls and a lightweight phenolic cage significantly reduces rotational mass and inertia. This allows the bearing to achieve a high limiting speed of 41,000 rpm with minimal heat generation and wear.
High Rigidity & Precision: The bearing is supplied with a light preload, which eliminates internal clearance. This ensures maximum shaft positioning accuracy, improved system stiffness, and reduced vibration and noise under load.
Superior Load Capacity: The 15° contact angle and robust internal geometry provide excellent capacity for combined radial and axial loads, making it suitable for complex loading conditions.
Long-Term Reliability: Manufactured to P4A super-precision standards with a chrome steel ring material, the bearing guarantees consistent performance, long service life, and high operational reliability in precision machinery.
7208 CDGB/HCP4A Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications where speed, precision, and rigidity are critical. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In high-accuracy robotic arms and joints.
- High-Frequency Motors & Spindles: Used in motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical instrumentation.
