S7008 ACD/P4AQBTA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7008 ACD/P4AQBTA
Basic Information
System of measurement
Metric
Weight
0.77 kg
Tolerance class
P4A
Seal type
Sealed
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
60 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
9518 lbf
Radial static load rating
9338 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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
Price available upon request.
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S7008 ACD/P4AQBTA Bearing Product Overview & Core Advantages
The S7008 ACD/P4AQBTA is a P4A ultra-precision metric double row angular contact ball bearing configured in a Quadruplex Tandem Back-to-Back (QBT) matched set. Engineered for the most demanding applications, this bearing delivers exceptional high rigidity and superior load-carrying capacity. Its primary advantage lies in its ability to handle significant combined loads (radial and axial) simultaneously, making it an ideal solution for high-precision, high-reliability machinery requiring maximum stiffness and rotational accuracy.
S7008 ACD/P4AQBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7008 | Basic bearing series and size designation (40mm bore, 68mm OD). |
| ACD | Angular Contact, Double Row design. |
| P4A | Indicates an ultra-precision tolerance class superior to ABEC 7, ensuring minimal runout and vibration for high-speed applications. |
| QBT | Specifies the bearing is part of a Quadruplex Tandem Back-to-Back matched set of 4 bearings, designed to handle very high axial loads and provide extreme rigidity. |
| A | Denotes an Extra Light preload for minimal friction and optimal high-speed performance. |
S7008 ACD/P4AQBTA Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Load Capacity: The double row angular contact design, combined with the QBT matched arrangement of four bearings, provides unparalleled system stiffness. This configuration is exceptionally effective at supporting heavy combined loads and high moment loads, ensuring precise shaft positioning under demanding conditions.
- Ultra-Precision Performance: Manufactured to a P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, which is critical for applications requiring minimal vibration and high rotational precision.
- Optimized for High Speeds: The phenolic cage offers low weight and excellent performance at the limiting speed of 41,000 rpm. The Extra Light (A) preload further enhances high-speed capability by reducing friction and heat generation.
- Sealed & Pre-Lubricated: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is ready for immediate installation, offering long-term, maintenance-free operation within its specified temperature range.
S7008 ACD/P4AQBTA Bearing Typical Application Areas
This bearing is specifically designed for ultra-high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Advanced Robotics and Automation (e.g., high-precision rotary joints)
- Other critical equipment requiring ultra-precision angular contact ball bearings in a multi-bearing, high-stiffness configuration.
