71918 CDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 CDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.55 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
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
10688 lbf
Radial static load rating
11475 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71918 CDGC/P4A Bearing Product Overview & Core Advantages
The 71918 CDGC/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior running accuracy. Operating under a Moderate (Class C) preload, this bearing is designed to primarily accommodate high axial loads in one direction while also supporting significant radial loads. Its P4A tolerance class ensures exceptional dimensional and rotational precision, making it ideal for high-speed spindles and other precision machinery. The bearing is Universal Matchable (SU), allowing for precise axial clearance adjustment when mounted in sets, which is critical for achieving optimal system rigidity and performance.
71918 CDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing designation indicating a lightweight, high-precision series with a 90mm bore, 125mm OD, and 18mm width. |
| C | Specifies a 15° contact angle, optimized for high axial load capacity. |
| DG | Indicates a Universal Matchable (SU) bearing. Two bearings can be paired face-to-face, back-to-back, or in tandem to form a matched set. |
| C | Denotes a Moderate preload (Class C), providing enhanced rigidity for the application. |
| P4A | Signifies an ABEC 7 / ISO P4 tolerance class with additional running accuracy requirements, ensuring minimal vibration and high-speed capability. |
71918 CDGC/P4A Bearing Structural Features & Performance Benefits
- High Precision and Rigidity: The P4A tolerance class and Moderate preload work in concert to deliver exceptional running accuracy and system stiffness, minimizing deflection under load.
- Optimized Load Capacity: The 15° contact angle is engineered to handle high axial loads efficiently while maintaining a robust radial load rating (10,688 lbf dynamic).
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 15,000 rpm. The open design facilitates efficient lubrication and cooling.
- Matched Set Versatility: As a Universal Matchable (SU) bearing, it can be supplied in pre-matched sets (typically 3 bearings) to create a defined preload or clearance, simplifying installation and ensuring consistent, predictable performance.
- Premium Materials: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
71918 CDGC/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Rotary Systems: Industrial robots, rotary tables, and indexing heads.
- High-Speed Motors and Drives: Electric spindles and high-frequency motor applications.
- Aerospace and Defense Systems: Gyroscopes, radar platforms, and other precision guidance systems.
