7008 ACD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7008 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.58 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
45 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7762 lbf
Radial static load rating
6975 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7008 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7008 ACD/P4ATBTB is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rigidity and accuracy. This bearing is supplied as a triplex back-to-back (TBT) matched set with a P4A super-precision tolerance, delivering superior running accuracy and system stability. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high performance under high-speed operation. The light preload (Class B) ensures minimal deflection and precise rotational characteristics, making it ideal for high-reliability, high-stiffness spindles and machinery.
7008 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 15mm width per bearing). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class, exceeding normal P4 standards for enhanced running accuracy. |
| TBT | Specifies the Triplex Back-to-Back matched arrangement of three bearings. |
7008 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy cutting forces.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads. With a dynamic load rating of 7762 lbf and static load rating of 6975 lbf, it ensures long service life in demanding conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel components and optimized internal geometry contribute to a high limiting speed of 56,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional tolerances on bore, OD, and width, this bearing guarantees minimal runout and superior rotational accuracy for applications like machine tool spindles.
7008 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is specifically designed for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arms.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
