7008 CD/HCP4ADGB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CD/HCP4ADGB
Basic Information
System of measurement
Metric
Weight
0.34 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
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6210 lbf
Radial static load rating
4950 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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7008 CD/HCP4ADGB Bearing Product Overview & Core Advantages
The 7008 CD/HCP4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universally matchable (SU) bearing is part of a matched set of two, enabling it to handle combined loads—significant radial loads and axial loads in one direction—with high reliability. Its construction with a phenolic cage and ceramic balls facilitates high-speed operation up to 41,000 rpm, while the P4A super-precision tolerance and light preload (Class B) ensure smooth running and minimal vibration, making it ideal for high-rigidity, high-precision spindles.
7008 CD/HCP4ADGB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7008 CD/HCP4ADGB provides detailed technical specifications:
- 7008: Basic bearing series with 40 mm bore, 68 mm outside diameter, and 30 mm width.
- C: Represents a 15° contact angle, optimized for high axial load capacity.
- D: Indicates the bearing is part of a universally matchable (SU) pair in a DB (back-to-back) arrangement when mounted.
- HC: Signifies the use of Hybrid Ceramic balls (ceramic balls with steel rings), offering reduced weight, lower friction, and higher speed capability.
- P4A: Denotes a super-precision tolerance class exceeding ABEC 7, ensuring extreme dimensional and running accuracy.
- ADGB: Indicates a Light Preload (Class B) applied to the universally matched set, reducing deflection and improving system rigidity.
7008 CD/HCP4ADGB Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds compared to all-steel bearings. This also enhances durability in potentially corrosive environments.
- Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent performance at high speeds, providing strength with minimal friction and superior guidance for the ceramic balls.
- Precision & Preload: Manufactured to P4A tolerance standards and supplied with a light preload, this bearing delivers exceptional running accuracy, high system stiffness, and precise rotational performance, critical for minimizing vibration and chatter.
- Universal Matchability (SU): As a universally matchable bearing, any two bearings from this group can be paired in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without performance loss, providing flexibility in mounting and optimal handling of combined loads and moments.
7008 CD/HCP4ADGB Bearing Typical Application Areas
This high-performance bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision, rigidity, and speed are paramount.
- Precision Robotics: Arm joints and servo motors requiring high accuracy and rapid response.
- High-Frequency Spindles: PCB drilling and routing spindles that operate at very high rotational speeds.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other instrumentation requiring reliable, high-speed operation.
- Medical Equipment: Dental handpieces and high-speed imaging device rotors.
