7008 CEGB/HCP4AH1
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7008 CEGB/HCP4AH1
Basic Information
System of measurement
Metric
Weight
0.17 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
15 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1721 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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
No drawings available at the moment, will be launched soon
In Stock
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7008 CEGB/HCP4AH1 Bearing Product Overview & Core Advantages
The 7008 CEGB/HCP4AH1 is a single-row angular contact ball bearing engineered for ultra-high precision applications. Positioned in the P4A super-precision tolerance class, it delivers exceptional running accuracy and rotational stability. A key advantage is its universal matchable (SU) design, allowing two bearings to be mounted in a tandem, back-to-back, or face-to-face arrangement to optimize performance for specific load and rigidity requirements. Its combination of a phenolic resin cage and ceramic balls enables superior high-speed performance and reduced rotational inertia.
7008 CEGB/HCP4AH1 Bearing Model Code Explained, Specifications & Naming Convention
The model number 7008 CEGB/HCP4AH1 provides detailed technical specifications through its suffixes:
- 7008: Basic designation indicating a 40mm bore, 68mm OD, and 15mm width.
- C: Denotes a 15° contact angle, optimized for high-speed applications with combined loads.
- E: Represents an optimized internal design with a larger ball complement and reinforced shoulders for increased load capacity.
- GB: Specifies a Light preload (Class B) for enhanced rigidity and precise shaft positioning.
- HCP4A: Indicates the P4A tolerance class, a super-precision grade with extremely tight dimensional and running accuracy tolerances.
- H1: Specifies a universally matchable (SU) bearing, supplied as one of a pair for precise preload control in matched sets.
7008 CEGB/HCP4AH1 Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The P4A tolerance class ensures minimal runout and vibration, critical for applications demanding extreme accuracy. The light preload (Class B) eliminates internal clearance, providing high system rigidity from startup.
- Superior High-Speed Capability: The combination of a lightweight phenolic resin cage and ceramic (silicon nitride) balls significantly reduces centrifugal forces, allowing for a limiting speed of 56,000 rpm. Ceramic balls also offer lower friction and reduced heat generation.
- Enhanced Load Capacity: The optimized "E" type internal design incorporates more and larger balls (19 balls, 7.144 mm diameter), substantially increasing the dynamic and static load ratings (2790 lbf / 1721 lbf).
- Universal Matching Versatility: As a Universal Matchable (SU) bearing, it provides design flexibility. Two bearings can be paired to handle complex load conditions, including combined radial and axial loads.
7008 CEGB/HCP4AH1 Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring utmost precision and rigidity.
- Precision Spindles: In PCB drilling, semiconductor manufacturing, and other fine machining equipment.
- High-Frequency Motors: Used in spindle motors and other applications where high rotational speeds are critical.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other instrumentation requiring reliable, high-speed rotation.
