7004 ACD/P4ADBA
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7004 ACD/P4ADBA
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
Extra light / Class A
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 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 7004 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched pair in a Back-to-Back (DB) arrangement is preloaded to Extra Light (Class A) specifications, ensuring minimal axial and radial play for superior running precision. Its primary advantages include the ability to support combined loads (substantial radial and axial loads simultaneously), high operational stiffness, and excellent performance at high speeds, making it an ideal choice for high-reliability, high-precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series and size designation (20mm bore, 42mm OD). |
| A | Contact angle of 25°. |
| CD | Indicates a Duplex pair in a Back-to-Back (DB) arrangement. |
| P4A | Specifies the high precision tolerance class, exceeding ABEC 7 standards. |
| DBA | Confirms the specific preload level within the matched set (Duplex Back-to-Back, Class A). |
7004 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads, providing exceptional shaft positioning accuracy and stability.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads from both directions, a hallmark of angular contact ball bearings.
- Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 103,000 rpm. The bearings are pre-lubricated for immediate operation.
- Premium Materials: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and long service life under demanding conditions.
7004 ACD/P4ADBA Bearing Typical Application Areas
This precision bearing set is engineered for high-performance applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Medical and Dental Equipment
- Optical and Measuring Instrumentation
