71905 CD/P4ADFD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CD/P4ADFD
Basic Information
System of measurement
Metric
Weight
0.084 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
18 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
2498 lbf
Radial static load rating
1800 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Face-to-Face (DF)
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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71905 CD/P4ADFD Bearing Product Overview & Core Advantages
The 71905 CD/P4ADFD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex bearing set features a Face-to-Face (DF) matched arrangement and a Heavy preload (Class D), delivering superior system stability and resistance to complex combined loads. Manufactured to a P4A tolerance class, it guarantees ultra-precise running accuracy, making it an ideal solution for high-performance spindles and precision machinery where uncompromising high rigidity and rotational precision are paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 18mm width) |
| C | 15° contact angle |
| D | Heavy preload (Class D) |
| P4A | High-precision tolerance class (exceeds ABEC 7) |
| DF | Duplex Face-to-Face matched arrangement |
71905 CD/P4ADFD Bearing Structural Features & Performance Benefits
- Superior Rigidity & Load Capacity: The duplex DF arrangement and heavy preload create an exceptionally rigid bearing system capable of withstanding significant combined loads (radial and axial) from both directions, minimizing shaft deflection under operation.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, contributing to the high limiting speed of 100,500 rpm. The optimized contact angle of 15° provides an excellent balance between axial load capacity and speed performance.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, ensuring precise fitment and minimal runout for applications demanding the highest levels of accuracy.
- Durable Construction: Components made from chrome steel offer high hardness and wear resistance, ensuring long service life and consistent performance under demanding conditions.
71905 CD/P4ADFD Bearing Typical Application Areas
This bearing is engineered for high-precision, high-speed applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy robotic arm joints and rotary actuators.
- Medical Equipment: Dental handpieces, high-speed centrifuges.
- Aerospace Instrumentation: Gyroscopes, navigation systems.
