S71920 CEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71920 CEGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.66 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
12.7 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
8775 lbf
Radial static load rating
7088 lbf
Limiting speed
16.25 X 1000 rpm
Lubrication
Grease
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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S71920 CEGA/HCP4A Bearing Product Overview & Core Advantages
The S71920 CEGA/HCP4A is a super-precision double row angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. Its design is optimized to simultaneously handle significant combined radial and axial loads from both directions. Featuring ceramic balls and a P4A ultra-precision tolerance, this bearing delivers exceptional rotational accuracy, reduced heat generation, and extended service life, making it ideal for high-reliability spindles and precision machinery.
S71920 CEGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Denotes the bearing series and size (100mm bore, 140mm OD, 20mm width). |
| CE | Indicates a 15° contact angle and that the bearing is Universal Matchable (SU), designed to be paired with an identical bearing for preload control. |
| GA | Specifies an Extra light preload (Class A), minimizing friction and heat for optimal high-speed performance. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce weight, centrifugal force, and operating temperature. |
| P4A | The tolerance class, representing ultra-precision dimensional and running accuracy superior to ABEC 7. |
S71920 CEGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row angular contact design provides superior rigidity and enables the bearing to support substantial combined loads (radial and bidirectional axial loads) efficiently.
- Enhanced High-Speed Performance: The combination of hybrid ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces and friction, allowing for a high limiting speed of 16,250 rpm.
- Ultra-Precision Operation: Manufactured to P4A tolerance standards, this bearing ensures minimal runout and vibration, which is critical for achieving high levels of machining finish and positional accuracy.
- Sealed & Lubricated for Life: As a sealed bearing pre-lubricated with grease, it is protected from contamination and is maintenance-free within its specified temperature range of -30°C to 110°C.
S71920 CEGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles for CNC milling, grinding, and turning centers
- High-frequency High-Speed Machining (HSM) spindles
- Precision spindles in PCB drilling and routing machines
- Rotary axes and high-precision gearboxes
