7008 ACBGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 ACBGA/P4A
Basic Information
System of measurement
Metric
Weight
0.21 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
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1550 lbf
Radial static load rating
1192 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7008 ACBGA/P4A Bearing Product Overview & Core Advantages
The 7008 ACBGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a single bearing with Universal Matchable (SU) designation, it can be precisely paired with another identical bearing to form a preloaded duplex set, offering superior system rigidity. Its P4A tolerance class ensures extremely tight dimensional and running accuracy, making it ideal for high-speed operation and applications subject to combined loads (radial and axial). The extra light preload (Class A) minimizes deflection under light loads, contributing to precise rotational performance.
7008 ACBGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width). |
| AC | Angular Contact design, optimized for combined loads. |
| BGA | Designates a Universal Matchable (SU) bearing that can be paired in various preloaded arrangements (Back-to-Back, Face-to-Face, Tandem). |
| P4A | Indicates a super-precision tolerance class, with running accuracy exceeding ABEC 7/ISO P4 standards, ensuring minimal vibration and high-speed capability. |
7008 ACBGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and robust construction enable the bearing to efficiently support significant combined radial and axial loads. When used in a matched set, the system rigidity is dramatically increased.
- Super-Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing achieves excellent running accuracy and stability, allowing for a high limiting speed of 56,000 rpm. The cage design reduces friction and is suitable for high acceleration.
- Optimized Internal Geometry: The bearing features 26 high-grade chrome steel balls with a diameter of 4.762 mm, providing a large load-carrying capacity relative to its compact bearing dimensions (40mm x 68mm x 15mm).
- Universal Matching Capability (SU): This feature allows for flexible mounting configurations. Two 7008 ACBGA/P4A bearings can be universally matched to create a preloaded pair, simplifying inventory and assembly for high-precision spindles.
7008 ACBGA/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and imaging scanner rotors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
