7204 CD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7204 CD/P4ADBC
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
15 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
11
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4388 lbf
Radial static load rating
2610 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7204 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7204 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched pair arrangement (Duplex Back-to-Back) provides superior stability and is preloaded to ensure minimal axial and radial play under operating conditions. Its key advantages include the ability to handle combined loads (radial and axial) simultaneously, high operational precision due to its P4A tolerance class, and excellent high-speed capabilities supported by its phenolic cage. This bearing is engineered for high-performance applications where reliability and precision are critical.
7204 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7204 | Basic bearing series, indicating a 20mm bore, 47mm OD, and 28mm width. |
| C | Specifies a 15° contact angle, optimized for handling combined loads. |
| D | Indicates the bearing is part of a Duplex (matched) set. |
| P4A | Denotes a high precision tolerance class, with enhanced dimensional and running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity. |
7204 CD/P4ADBC 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, making it ideal for precision spindles.
- Superior Load Capacity: The 15° contact angle and duplex design enable the bearing to support significant combined radial and axial loads in both directions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures smooth operation and lower centrifugal forces at high speeds, contributing to a limiting speed of 100,500 rpm.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees exceptional running accuracy, low noise, and minimal vibration for demanding applications.
- Preloaded Configuration: Supplied with a moderate preload (Class C), the bearing eliminates internal clearance, enhancing system stiffness and positioning accuracy from startup.
7204 CD/P4ADBC Bearing Typical Application Areas
This precision duplex bearing is critical in applications requiring high speed, rigidity, and accuracy. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Drives & Feed Systems: Servo motors, robotics, and automated positioning systems.
- High-Frequency Spindles: PCB drilling and routing equipment.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
