7004 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 ACD/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3038 lbf
Radial static load rating
1834 lbf
Limiting speed
103 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
Price:
$ 103.61
/ each
In Stock
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7004 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7004 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric system bearing is supplied as a matched set in a back-to-back (DB) arrangement with a Light preload (Class B), enabling it to handle combined loads—significant radial and axial loads in both directions. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed, high-rigidity spindles and other demanding precision machinery.
7004 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Standard bearing series designation, indicating a 20mm bore, 42mm OD, and 24mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (two bearings supplied as a matched set). |
| P4A | High precision tolerance class, exceeding ABEC 7 standards, for exceptional running accuracy. |
| DBB | Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and excellent stability. |
7004 ACD/P4ADBB Bearing Structural Features & Performance Benefits
- Superior Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise shaft positioning under heavy combined loads.
- High-Speed Capability: The lightweight and robust phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for smooth operation at the high limiting speed of 103,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed applications.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width. This guarantees minimal runout and vibration, which is critical for maintaining high surface finishes and machining accuracy.
- Optimized Load Capacity: The design, with a dynamic load rating of 3038 lbf and a static load rating of 1834 lbf, is engineered to handle demanding applications. The light preload eliminates internal clearance, enhancing stiffness and rotational accuracy from startup.
7004 ACD/P4ADBB Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Medical Equipment: Dental handpieces and high-speed surgical drills.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational accuracy are required.
