7204 ACD/P4ADBD
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7204 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
0.21 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
47 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
11
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4185 lbf
Radial static load rating
2520 lbf
Limiting speed
100.5 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
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7204 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 7204 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement is preloaded to Class D (Heavy), providing superior system stiffness and minimal axial/radial runout. It excels at handling combined loads (radial and axial) simultaneously, making it ideal for high-precision, high-rigidity machinery where rotational accuracy is paramount. The bearing is supplied pre-lubricated and features an open design for controlled lubrication management.
7204 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7204 A | Standard bearing series with 20mm bore, 47mm OD | Defines the core dimensions and contact angle (25°). |
| C | 15° nominal contact angle design | Optimized for high axial load capacity. |
| D | Duplex Back-to-Back (DB) arrangement | Provides high moment rigidity and preload. |
| P4A | High precision tolerance class | Ensures extremely tight dimensional and running accuracy. |
| DBD | Universal matching designation for duplex sets | Indicates bearings are selectively matched for optimal performance in a back-to-back pair. |
7204 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex back-to-back (DB) configuration with a heavy preload (Class D) creates an exceptionally stiff bearing system, effectively resisting moment loads and minimizing deflection under operation.
- Superior Load Capacity: The 25° contact angle and robust construction enable high radial dynamic load rating (4185 lbf) and static load rating (2520 lbf), making it suitable for applications with significant combined loads.
- Precision & High-Speed Capability: Manufactured to P4A tolerance class for exceptional running accuracy. The lightweight phenolic cage and optimized internal geometry support a high limiting speed of 100,500 rpm, suitable for high-speed spindles.
- Optimized Material & Lubrication: Constructed from chrome steel for both rings and balls, ensuring high durability and fatigue resistance. The bearing comes pre-lubricated for immediate operation within a wide temperature range of -30°C to 110°C.
7204 ACD/P4ADBD Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes requiring extreme precision and rigidity.
- Precision Rotary Systems: Industrial robotics, rotary tables, and indexing heads.
- High-Frequency Motors & Spindles: Where high rotational speeds and accuracy are critical.
- Medical & Laboratory Equipment: High-speed centrifuges and precision instruments.
