71905 CE/HCP4ALDBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CE/HCP4ALDBA
Basic Information
System of measurement
Metric
Weight
0.072 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
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1960 lbf
Radial static load rating
1260 lbf
Limiting speed
83 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
Extra light / Class A
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 CE/HCP4ALDBA Bearing Product Overview & Core Advantages
The 71905 CE/HCP4ALDBA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a duplex back-to-back (DB) matched set, it offers superior rigidity and can accommodate combined radial and axial loads. Manufactured to the stringent P4A tolerance class and featuring a ceramic ball and phenolic cage construction, this bearing is engineered for high reliability in demanding operational environments.
71905 CE/HCP4ALDBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 CE/HCP4ALDBA provides detailed technical specifications:
- 71905: Basic bearing series and size designation (25mm bore, 42mm OD, 18mm width).
- C: 15° contact angle, optimized for high-speed applications with axial loads.
- E: High-grade ceramic balls (Silicon Nitride), offering reduced weight, higher stiffness, and superior performance at high speeds.
- HC: Phenolic resin cage, providing high strength, low weight, and excellent performance in high-speed and high-temperature conditions.
- P4A: Super-precision tolerance class, ensuring extremely tight dimensional and running accuracy.
- A: Extra light preload applied to the duplex set, minimizing runout and ensuring high system stiffness.
- DB: Duplex Back-to-Back arrangement, providing high moment rigidity and the ability to handle bidirectional axial loads.
71905 CE/HCP4ALDBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a robust, preloaded system capable of withstanding significant combined radial and axial loads and moment loads, making it ideal for applications requiring high shaft stability.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage (HC) and low-density ceramic balls (E) significantly reduces centrifugal forces, enabling a high limiting speed of 83,000 rpm. The 15° contact angle is specifically chosen for optimal high-speed operation.
- Precision and Longevity: Manufactured to P4A super-precision standards, this bearing ensures minimal vibration and noise. The ceramic balls offer excellent wear resistance and a longer operational life, especially in challenging environments.
- Optimized for Precision Systems: The extra light preload (A) on the matched set eliminates internal clearance, providing precise rotational accuracy and immediate response to load changes, which is critical for high-precision machinery.
71905 CE/HCP4ALDBA Bearing Typical Application Areas
This high-precision bearing is specifically designed for advanced applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Aerospace Actuators and Control Systems
- Medical and Dental Drill Handpieces
- Advanced Semiconductor Manufacturing Equipment
