71905 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71905 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.039 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
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71905 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71905 CDGA/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. As a single bearing with an extra light preload (Class A), it delivers smooth operation and minimal deflection under load. Its standout feature is the combination of a phenolic resin cage and ceramic balls, which significantly reduces weight and inertial forces, enabling superior high-speed capabilities up to 100,500 rpm. This bearing is universally matchable (SU), allowing for precise duplex arrangements to handle complex combined loads (radial and axial) with high rigidity and reliability in compact installations.
71905 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 CDGA/HCP4A is decoded as follows:
- 71905: Basic bearing series, indicating a light series, 25mm bore, 42mm OD, 9mm width.
- C: 15° contact angle, optimized for high-speed applications with axial loads.
- DG: Universal Matchable (SU) bearing, designed to be paired in duplex sets (back-to-back, face-to-face, or tandem).
- A: Denotes Extra Light Preload (Class A), providing minimal internal clearance for high rotational accuracy and rigidity.
- HCP4A: High-Precision P4A Tolerance Class, specifying extremely tight dimensional and running accuracy tolerances for the most demanding spindle applications.
71905 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & Low Inertia: The combination of a lightweight phenolic cage and low-density ceramic balls dramatically reduces centrifugal forces, enabling stable operation at the very high limiting speed of 100,500 rpm.
- High Rigidity & Precision: The extra light preload (Class A) eliminates internal clearance, resulting in superior shaft positioning accuracy and system stiffness, which is critical for machine tool spindles.
- Superior Load Capacity: With a dynamic load rating of 1521 lbf and static load rating of 900 lbf, it reliably handles significant combined radial and axial loads.
- Thermal Stability: The phenolic cage and ceramic components offer excellent dimensional stability across the operating temperature range of -30°C to 110°C.
- Universal Matching: The SU universal matching designation allows for precise pairing (sets of 2) to create custom bearing arrangements that meet specific application requirements for preload and stiffness.
71905 CDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and rigidity are paramount.
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical scanners.
- High-Frequency Motors & Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
