71901 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71901 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.01 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
12 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.004mm to 0
Width
6 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
596 lbf
Radial static load rating
281 lbf
Limiting speed
220 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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71901 CDGA/HCP4A Bearing Product Overview & Core Advantages
The 71901 CDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered with a 15° contact angle and an Extra Light (A) preload, this bearing delivers superior rotational accuracy and rigidity. Its ceramic ball construction and P4A super-precision tolerance class make it ideal for high-speed operation up to 220,000 rpm, offering excellent resistance to thermal expansion and electrical arcing. This single bearing is universally matchable (SU), allowing for precise duplex arrangements to handle combined radial and axial loads efficiently in a compact 6mm width design.
71901 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Basic bearing series and size designation (12mm bore, 24mm OD). |
| C | 15° nominal contact angle. |
| DG | Universal matchable bearing designation for duplex mounting. |
| A | Extra Light preload class. |
| HCP4A | Tolerance class P4A (higher than ABEC 7) with enhanced running accuracy. |
71901 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls (Si3N4), which are 60% lighter than steel, and a lightweight phenolic resin cage significantly reduces centrifugal forces, enabling stable operation at the limiting speed of 220,000 rpm.
- Superior Rigidity & Accuracy: The 15° contact angle and Class A preload provide high system stiffness and minimal axial/radial runout, which is critical for precision positioning. The P4A tolerance class ensures exceptionally tight dimensional control on all bearing surfaces.
- Enhanced Durability: Ceramic balls offer superior wear resistance and a longer service life. They are non-corrosive and provide electrical insulation, preventing damage from electrical currents.
- Thermal Stability: Ceramic balls have a lower coefficient of thermal expansion than steel, helping to maintain preload stability and performance across the operating temperature range of -30°C to 110°C.
71901 CDGA/HCP4A Bearing Typical Application Areas
- High-Speed Machining Spindles: For CNC milling, grinding, and drilling centers where high rotational speed and precision are paramount.
- Precision Instrumentation: Used in coordinate measuring machines (CMM), optical scanners, and laboratory equipment.
- Semiconductor Manufacturing: Critical components in wafer handling robots, steppers, and other cleanroom machinery.
- Aerospace Gyroscopes and Actuators: Applications demanding the ultimate in accuracy, speed, and reliability.
