71905 CD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CD/HCP4ADBC
Basic Information
System of measurement
Metric
Weight
0.078 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71905 CD/HCP4ADBC Bearing Product Overview & Core Advantages
The 71905 CD/HCP4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. 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 P4A tolerance class and featuring ceramic balls and a phenolic cage, it is engineered for high-speed operation and reliable performance in precision machinery.
71905 CD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 CD/HCP4ADBC is decoded as follows:
- 71905: Denotes the bearing series and size (5mm bore, 42mm OD, 18mm width).
- C: Indicates a 15° contact angle, optimized for high-speed applications.
- D: Signifies a Duplex Back-to-Back (DB) preloaded pair.
- HC: Refers to the Hybrid Ceramic construction (steel rings with ceramic balls).
- P4A: Specifies the ABEC 7 / P4A super-precision tolerance class.
- DB: Confirms the Duplex Back-to-Back mounting arrangement.
- C: Indicates a Moderate preload (Class C).
71905 CD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and supports high combined radial and axial loads.
- Superior High-Speed Performance: The combination of lightweight phenolic resin cage and ceramic balls (Silicon Nitride) reduces centrifugal forces, lowers operating temperature, and enables a very high limiting speed of 100,500 rpm.
- Enhanced Durability & Long Life: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel, significantly extending service life, especially in contaminated or poorly lubricated environments.
- Precision & Thermal Stability: Manufactured to P4A tolerance class for exceptional running accuracy. The phenolic cage and ceramic balls contribute to stable performance across the operating temperature range (-30°C to 110°C).
71905 CD/HCP4ADBC Bearing Typical Application Areas
This high-performance bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors & Spindles: Where extreme rotational speeds and accuracy are critical.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: Dental handpieces and high-speed surgical drills.
