S71905 CEGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71905 CEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.042 kg
Tolerance class
P4A
Seal type
Sealed
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
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1186 lbf
Radial static load rating
630 lbf
Limiting speed
83 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S71905 CEGA/P4A Bearing Product Overview & Core Advantages
The S71905 CEGA/P4A is a super-precision angular contact ball bearing engineered for applications demanding the highest levels of accuracy and performance. As a single bearing designed for universal matching (SU), it can be mounted in pairs to create a rigid, preloaded set capable of handling combined loads—significant radial loads and axial loads in both directions. Its compact 9mm width, P4A tolerance class, and Extra Light preload (Class A) make it an ideal solution for high-speed spindles and other high-precision machinery where minimal runout and exceptional rotational accuracy are critical.
S71905 CEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for a super-precision, 15° contact angle bearing. |
| 1905 | Bore size 05 (25mm) x Outside diameter 19 (42mm). |
| CE | Enhanced internal geometry and grinding for improved performance and lower noise. |
| GA | Indicates a light preload when bearings are universally matched. |
| P4A | The tolerance class, denoting extremely tight dimensional and running accuracy superior to ABEC 7. |
S71905 CEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The optimized 15° contact angle and universal matchable design allow two bearings to be paired for high system rigidity, efficiently supporting combined radial and axial loads from both directions.
- Super-Precision Performance: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional running accuracy and minimal vibration for ultra-precise applications.
- High-Speed Capability: The lightweight phenolic resin cage and optimized internal design contribute to low friction and a high limiting speed of 83,000 rpm, making it suitable for demanding high-speed spindle applications.
- Sealed and 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.
S71905 CEGA/P4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Robotics: Precision joints and arm assemblies requiring high rigidity.
