S71918 CEGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71918 CEGA/P4A
Basic Information
System of measurement
Metric
Weight
0.54 kg
Tolerance class
P4A
Seal type
Sealed
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
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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S71918 CEGA/P4A Bearing Product Overview & Core Advantages
The S71918 CEGA/P4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing from a universally matchable (SU) pair, it excels at handling combined loads, including radial loads and axial loads in one direction. Its extra light preload (Class A) and P4A tolerance class ensure exceptional running accuracy, minimal vibration, and optimal performance in precision machinery, making it a benchmark for high-speed spindles.
S71918 CEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Super-precision bearing |
| 7 | Angular contact ball bearing |
| 1918 | Bore diameter: 90 mm, Outside diameter: 125 mm, Width: 18 mm |
| C | 15° contact angle |
| E | Optimized internal design for high speed |
| GA | Light preload (Class A) |
| P4A | Geometric tolerance class superior to ABEC 7/ISO P4 |
S71918 CEGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to a P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. The extra light preload (Class A) eliminates internal clearance, providing maximum system stiffness and precise rotational accuracy for critical applications.
- Superior High-Speed Capability: The phenolic resin cage is lightweight and exhibits excellent performance at high speeds, contributing to a low limiting speed of 15,000 rpm. The optimized internal geometry (designated by suffix E) further enhances high-speed stability.
- Optimized Load Capacity: With a 15° contact angle and a dynamic load rating of 6908 lbf, this bearing is engineered to handle significant combined radial and axial loads simultaneously.
- Universal Matchability (SU): This bearing is universally matchable, allowing any two bearings to be paired in a duplex set (DB, DF, or DT arrangement) without selective matching, simplifying inventory and assembly for preloaded configurations.
- Sealed & Pre-Lubricated: The sealed design protects against contamination and retains the factory-fill grease lubrication, supporting reliable operation within a temperature range of -30°C to 110°C.
S71918 CEGA/P4A Bearing Typical Application Areas
The S71918 CEGA/P4A is the bearing of choice for high-performance equipment requiring exceptional speed and precision, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Aerospace Gyroscopes and Instrumentation
- Medical and Dental Handpiece Drives
