7004 CD/P4ADBG2GMM
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 CD/P4ADBG2GMM
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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3150 lbf
Radial static load rating
1912 lbf
Limiting speed
121 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
Available
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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7004 CD/P4ADBG2GMM Bearing Product Overview & Core Advantages
The 7004 CD/P4ADBG2GMM is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched set features a back-to-back (DB) arrangement and is manufactured to the stringent P4A tolerance class, ensuring superior runout control. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial loads and axial loads in both directions—making it an ideal choice for high-precision, high-rigidity spindles and systems requiring preload for optimal performance.
7004 CD/P4ADBG2GMM Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing designation: 20mm bore, 42mm OD, 24mm width. |
| C | 15° contact angle. |
| D | Duplex bearing set. |
| P4A | High precision tolerance class (superior to ABEC 7). |
| DB | Back-to-Back mounting arrangement. |
| G | Preload level (light). |
| 2G | Radial internal clearance group. |
| MM | Bearing set is universally matchable. |
7004 CD/P4ADBG2GMM Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) design creates a wide, rigid support system that significantly increases moment stiffness. This configuration is exceptionally effective at handling combined radial and axial loads from both directions, providing stable and precise shaft positioning.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and excellent guidance for the rolling elements. This contributes to smooth operation at high rotational speeds, with a limiting speed of 121,000 rpm.
- Optimized for Preload: The bearings are supplied as a matched set with a defined preload (G), eliminating internal clearance. This pre-installed preload enhances system stiffness, improves rotational accuracy, and reduces noise and vibration from the moment of installation.
- Material & Lubrication: Constructed from chrome steel for both rings and balls, ensuring high durability and fatigue life. The bearing is open and pre-lubricated with grease, suitable for a temperature range of -30°C to 110°C.
7004 CD/P4ADBG2GMM Bearing Typical Application Areas
This precision duplex angular contact ball bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Medical Equipment: Dental handpieces and laboratory automation.
- Test & Measurement Equipment: Where minimal runout and high rigidity are critical.
