71905 CD/P4ADBD
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 CD/P4ADBD
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 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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In Stock
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71905 CD/P4ADBD Bearing Product Overview & Core Advantages
The 71905 CD/P4ADBD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement provides superior stiffness and the ability to withstand combined loads, including significant radial and bidirectional axial loads. Manufactured to the stringent P4A tolerance class and featuring a Heavy (Class D) preload, it is engineered for high-precision, high-reliability scenarios where minimal deflection and precise rotational accuracy are critical.
71905 CD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 CD/P4ADBD is decoded as follows:
- 71905: Denotes the bearing series and size (25mm bore, 42mm OD, 18mm width).
- C: Signifies a 15° contact angle, optimized for high axial load capacity.
- D: Indicates the Heavy preload (Class D) for maximum system rigidity.
- P4A: Represents the tolerance class, specifying extremely tight dimensional and running accuracy.
- DB: Stands for Duplex Back-to-Back arrangement, enhancing moment load capacity and rigidity.
- Open / Lubricated: The bearing is supplied with lubrication for immediate operation.
71905 CD/P4ADBD Bearing Structural Features & Performance Benefits
- High Rigidity & Preload: The duplex back-to-back (DB) configuration and Heavy preload (Class D) work in tandem to create an exceptionally stiff bearing unit, drastically reducing axial and radial play under operational loads. This is vital for applications requiring high positional accuracy.
- Superior Load Capacity: The 15° contact angle and optimized internal geometry enable the bearing to efficiently handle combined radial and axial loads from both directions.
- Precision & Speed: Built to P4A tolerance class standards, this bearing ensures smooth, quiet, and precise operation. The lightweight phenolic resin cage contributes to excellent high-speed performance, with a limiting speed of 100,500 rpm.
- Durability & Material Quality: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers high fatigue life and wear resistance, suitable for a temperature range of -30°C to 110°C.
71905 CD/P4ADBD Bearing Typical Application Areas
This high-precision, high-rigidity bearing is ideally suited for:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- Precision Gearboxes and High-Speed Drives
- Industrial Pumps and Compressors
- Robotics and Automation Equipment
- Medical Equipment and Scientific Instruments
