71905 CDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.042 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
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
900 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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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71905 CDGB/P4A Bearing Product Overview & Core Advantages
The 71905 CDGB/P4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its key advantage lies in its ability to accommodate combined loads, primarily handling high radial loads and unidirectional axial loads efficiently. The light preload (Class B) minimizes deflection under operational forces, ensuring high system rigidity and precise shaft positioning, making it ideal for demanding, high-speed machinery.
71905 CDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 CDGB/P4A is decoded as follows:
- 71905: Basic designation for a single row angular contact ball bearing with a 25mm bore and 42mm outside diameter.
- C: Denotes a 15° contact angle, optimized for high-speed operation and high radial load capacity.
- D: Indicates the bearing is supplied as a Universal Matchable (SU) set. Two bearings are precision-ground to be mounted in a universal arrangement (face-to-face or back-to-back).
- G: Specifies a Light Preload (Class B), which increases bearing stiffness and controls axial and radial play.
- B: Refers to the material of the cage, which is Phenolic, offering excellent performance at high speeds.
- P4A: The tolerance class, indicating very high precision levels for dimensional and running accuracy, superior to ABEC-7.
71905 CDGB/P4A Bearing Structural Features & Performance Benefits
The performance of the 71905 CDGB/P4A is a direct result of its precision engineering and material selection.
- High Precision & Rigidity: The P4A tolerance class ensures minimal runout and vibration. Combined with the light preload, this provides high system rigidity, critical for maintaining accuracy under load.
- Optimized Load Capacity: The 15° contact angle is engineered to support significant radial loads while also effectively handling axial loads in one direction.
- Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, reduces friction, and allows for a high limiting speed of 100,500 rpm. The open design facilitates efficient lubrication management.
- Universal Matching Capability: Being Universal Matchable (SU), two bearings can be paired to accommodate combined loads and moments in various configurations, providing design flexibility for complex spindle arrangements.
71905 CDGB/P4A Bearing Typical Application Areas
This high-precision angular contact bearing is specified in applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and high-frequency motor spindles.
- Robotics: High-accuracy joints and actuators.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace Instrumentation: Gyroscopes and navigation system components.
