7004 ACE/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 ACE/P4ADBB
Basic Information
System of measurement
Metric
Weight
0.13 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
2632 lbf
Radial static load rating
1440 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
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In Stock
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7004 ACE/P4ADBB Bearing Product Overview & Core Advantages
The 7004 ACE/P4ADBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched set of two bearings is arranged in a Back-to-Back (DB) configuration, providing high resistance to moment loads and excellent operational stability. With its P4A tolerance class and light preload (Class B), it is engineered for high-speed performance and precise positioning in sophisticated machinery. Its compact design efficiently handles combined radial and axial loads, making it an ideal choice for high-reliability applications.
7004 ACE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series, indicating a 20mm bore, 42mm OD, and 24mm width. |
| ACE | Internal design code, typically signifying a 25° contact angle and specific internal geometry optimized for high-speed operation. |
| P4A | Indicates a high-precision tolerance class, with extremely tight dimensional and running accuracy tolerances superior to ABEC 7. |
| DB | Signifies the Duplex Back-to-Back mounting arrangement of the two matched bearings in the set. |
7004 ACE/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The Back-to-Back (DB) duplex arrangement creates a wide effective spread between load centers, significantly increasing the bearing system's rigidity and its ability to withstand moment loads and tilting moments.
- Superior Precision: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for maintaining high positional accuracy in precision equipment.
- Optimized High-Speed Performance: The phenolic resin cage offers low weight and excellent sliding properties, contributing to lower friction and higher limiting speeds. The 25° contact angle provides a balanced capacity for radial and axial loads at high rotational velocities.
- Pre-Configured for Performance: The set comes with a light preload (Class B) applied, eliminating internal clearance and ensuring immediate, precise performance without the need for complex adjustment during installation.
7004 ACE/P4ADBB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Gearboxes: Especially in applications with high output speeds and significant axial loads.
- High-Frequency Spindles: Used in PCB drilling, engraving, and other high-RPM machining processes.
- Medical Equipment: In centrifuges and other high-speed laboratory or diagnostic devices.
- Robotic Arms and Actuators: Where precise motion control and high stiffness are paramount.
