7205 ACD/P4ADBD
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7205 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
0.26 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
52 mm
Outside diameter tolerance
-0.004mm to 0
Width
30 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4770 lbf
Radial static load rating
3082 lbf
Limiting speed
71.5 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
No drawings available at the moment, will be launched soon
In Stock
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7205 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 7205 ACD/P4ADBD is a duplex pair of precision angular contact ball bearings in a Back-to-Back (DB) arrangement, preloaded to Heavy / Class D. This configuration is engineered for applications demanding extremely high rigidity and precise rotational accuracy under combined loads, including significant radial and bidirectional axial forces. Manufactured to the exacting P4A tolerance class, this matched set offers superior running accuracy, making it ideal for high-performance spindles and other high-precision machinery where minimal deflection and maximum stability are critical.
7205 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7205 | Basic bearing series, indicating a 25 mm bore, 52 mm OD, and angular contact design. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Indicates a duplex pair of two bearings. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7), ensuring exceptional dimensional and running accuracy. |
| DB | Denotes the Back-to-Back mounting arrangement, which provides high moment rigidity and stable preload. |
7205 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex Back-to-Back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection. The Heavy preload (Class D) eliminates internal clearance, ensuring maximum stiffness and precise rotational positioning.
- Superior Load Capacity: The 25° contact angle and duplex design enable the bearing set to handle significant combined radial and axial loads from both directions simultaneously.
- Precision & High-Speed Capability: The P4A tolerance class guarantees minimal runout and vibration. The lightweight phenolic resin cage and optimized internal geometry contribute to lower friction and stable operation at high speeds, with a limiting speed of 71,500 rpm.
- Durability & Reliability: Constructed from high-grade chrome steel for rings and balls, this bearing offers excellent wear resistance and long service life under demanding conditions.
7205 ACD/P4ADBD Bearing Typical Application Areas
This precision duplex bearing set is specifically designed for high-end applications where uncompromising accuracy and rigidity are non-negotiable. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring ultra-fine surface finishes.
- High-Frequency Motors & Spindles: Where rapid acceleration and deceleration are routine.
- Medical & Dental Equipment: High-speed handpieces and scanners.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
