7008 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7008 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.38 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
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
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7008 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7008 ACD/P4ADBB is a precision duplex angular contact ball bearing specifically engineered for applications demanding exceptional rotational accuracy and high rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B standards, providing superior stability and minimizing axial and radial runout. Its fundamental advantage lies in its ability to support combined loads—simultaneously handling significant radial loads and thrust loads in both directions. Manufactured to P4A tolerance class, this bearing is the ideal solution for high-precision, high-reliability machinery where uncompromising performance is critical.
7008 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 30mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a Duplex (two-bearing) set. |
| P4A | Denotes a high-precision tolerance class with enhanced running accuracy requirements. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity. |
| B | Indicates a Light preload is applied to the matched set. |
7008 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise alignment and minimal vibration under operation.
- Superior Load Capacity: The 25° contact angle and duplex design enable the bearing to handle substantial combined radial and axial loads from both directions simultaneously, making it suitable for complex loading conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction, contributing to smooth operation at high rotational speeds, with a limiting speed of 56,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, this bearing guarantees exceptional running accuracy and consistent performance.
- Durable Construction: Components made from chrome steel for both rings and balls offer high wear resistance and long service life under demanding conditions.
7008 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring extreme accuracy and rigidity, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-performance automotive transmissions.
- High-Frequency Spindles: Used in PCB drilling and routing equipment.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
- Aerospace Actuators & Control Systems: Where reliability and precision are non-negotiable.
