S7008 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S7008 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.39 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
30 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
5850 lbf
Radial static load rating
4680 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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
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S7008 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S7008 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and rotational accuracy. This matched set features a Back-to-Back (DB) arrangement with an Extra Light (Class A) preload, providing superior stability and resistance to moment loads. Manufactured to P4A tolerance class, it ensures minimal runout and is ideally suited for high-speed spindles and other high-precision, high-rigidity machinery. Its sealed design and pre-lubrication contribute to long-term, maintenance-free operation.
S7008 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact, Duplex arrangement. Indicates the bearing is supplied as a pre-set pair. |
| DB | Back-to-Back mounting. This arrangement provides high rigidity and can withstand moment loads. |
| P4A | High-Precision Tolerance Class. Exceeds ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
S7008 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex Back-to-Back (DB) design and Class A preload create a highly rigid bearing system that effectively counters overturning moments and shaft deflection, ensuring precise rotational alignment.
- Superior Precision: Manufactured to P4A tolerance class with a 25° contact angle, this bearing delivers exceptional running accuracy and low vibration levels, which is critical for high-speed applications.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and grease lubrication contribute to a high limiting speed of 41,000 rpm.
- Robust Load Capacity: The design is engineered to support combined loads (radial and axial) simultaneously, with a high dynamic load rating of 5850 lbf for long service life.
- Sealed & Ready-to-Use: The sealed construction protects against contamination, and the bearing is pre-lubricated with grease, making it a maintenance-free solution within its specified temperature range.
S7008 ACD/P4ADBA Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and other high-precision metalworking equipment.
- High-Speed Motors & Spindles: Used in applications requiring high rotational speeds with minimal runout.
- Precision Instrumentation: Critical for medical devices, optical scanners, and measuring equipment.
- Robotics: Provides the necessary accuracy and rigidity in robotic arm joints and precision gearboxes.
