71918 ACB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACB/P4A
Basic Information
System of measurement
Metric
Weight
0.59 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.009mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
36
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
3780 lbf
Radial static load rating
3735 lbf
Limiting speed
19 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1090.38
/ each
In Stock
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71918 ACB/P4A Bearing Product Overview & Core Advantages
The 71918 ACB/P4A is a single-row angular contact ball bearing designed for applications demanding high precision and exceptional rotational accuracy. Operating under the P4 (ABEC-7) tolerance class, it is engineered to handle significant axial loads in one direction, making it ideal for high-speed spindles and other precision machinery. Its key advantages include a 25° contact angle for optimal axial load capacity, a lightweight phenolic cage for superior high-speed performance, and the availability of preload options for enhanced system rigidity and reduced vibration.
71918 ACB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71918 | Basic Bearing Series & Size | Denotes a metric, single-row angular contact bearing with a 90mm bore, 125mm OD, and 18mm width. |
| ACB | Contact Angle & Internal Design | Indicates a 25° contact angle and a specific internal geometry optimized for high rigidity and speed. |
| P4A | Tolerance Class | Specifies a P4 (ABEC-7) precision grade, ensuring extremely tight dimensional and running accuracy for high-performance applications. |
71918 ACB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a 25° contact angle, this bearing provides exceptional system stiffness and running accuracy, minimizing deflection under load.
- Superior High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling a high limiting speed of 19,000 rpm and stable operation.
- Optimized Load Capacity: The angular contact design is engineered to support high axial loads in one direction simultaneously with radial loads, with a dynamic load rating of 3780 lbf.
- Preload Availability: The option for preload allows for precise control over internal clearance, resulting in increased bearing rigidity and improved positional accuracy of the shaft.
71918 ACB/P4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles (e.g., CNC milling, grinding, and high-speed machining centers)
- Precision Gearboxes and Robotic Drives
- High-Frequency Motors and Spindle Drives
- Medical Equipment and Optical Instrumentation
