71901 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71901 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.009 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
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
486 lbf
Radial static load rating
198 lbf
Limiting speed
165 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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71901 CEGA/HCP4A Bearing Product Overview & Core Advantages
The 71901 CEGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing with a 15° contact angle and P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its core advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in one direction—making it ideal for applications requiring uncompromising precision and reliability. The combination of a ceramic ball and phenolic cage construction enables superior high-speed performance and reduced rotational inertia.
71901 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Standard designation for a super-precision, light series angular contact ball bearing. |
| C | Specifies a 15° contact angle. |
| EGA | Indicates the bearing is universally matchable (SU), allowing it to be paired with another bearing in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to accommodate various load conditions. |
| HC | Signifies the use of hybrid ceramic balls (silicon nitride), which reduce friction, heat generation, and wear, contributing to the high limiting speed. |
| P4A | Denotes an ABEC 7 / ISO P4 tolerance class with additional dimensional and running accuracy requirements for the tightest precision. |
71901 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls provides superior performance, including electrical insulation, reduced centrifugal forces, and extended service life at high speeds.
- Phenolic Cage: The lightweight and robust phenolic resin cage ensures excellent dimensional stability and low friction, further enhancing the bearing's high-speed capability and smooth operation.
- Extra Light Preload (Class A): This preload class minimizes axial and radial play, resulting in high system rigidity, precise shaft positioning, and reduced noise and vibration.
- Universal Matchability: The EGA suffix means this bearing can be universally paired, allowing for easy creation of preloaded bearing sets (in a set of 2) to handle complex combined loads without the need for selective assembly.
- Pre-lubricated: The bearing comes pre-lubricated for immediate use, offering reliable operation within its specified temperature range.
71901 CEGA/HCP4A Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives and Motors
- Medical and Dental Drill Handpieces
- Aerospace Instrumentation and Gyroscopes
- Semiconductor Manufacturing Equipment
