71918 CEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 CEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.54 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6908 lbf
Radial static load rating
5400 lbf
Limiting speed
15 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
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71918 CEGA/P4A Bearing Product Overview & Core Advantages
The 71918 CEGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to simultaneously handle combined radial and axial loads, this single bearing features a 15° contact angle and an Extra Light (A) preload for superior performance in high-speed, high-precision environments. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and consistent operation, making it an ideal solution for machine tool spindles and other precision machinery where reliability is critical.
71918 CEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CEGA | Universal Matchable bearing designed for duplex mounting (back-to-back or face-to-face) |
| P4A | High precision tolerance class with enhanced dimensional and running accuracy |
71918 CEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The angular contact design with 15° contact angle and Extra Light preload provides exceptional stiffness and minimal deflection under load, ensuring precise rotational characteristics.
- Superior Load Capacity: Engineered to handle combined radial and axial loads simultaneously, with a dynamic load rating of 6908 lbf and static load rating of 5400 lbf.
- Optimized High-Speed Performance: The phenolic resin cage and precision-ground components enable stable operation at limiting speeds up to 15,000 rpm.
- Universal Matching Capability: As a Universal Matchable (SU) bearing, it can be paired with identical bearings in various arrangements to achieve specific stiffness and preload requirements.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring durability and long service life in demanding applications.
71918 CEGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Instrumentation - Measuring equipment and optical devices
- High-Speed Motors - Spindle motors and high-frequency applications
- Aerospace Components - Guidance systems and precision actuators
- Medical Equipment - Dental handpieces and surgical tools
