71918 CB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71918 CB/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
15 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
36
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
4005 lbf
Radial static load rating
3960 lbf
Limiting speed
22 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:
$ 1090.17
/ each
In Stock
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71918 CB/P4A Bearing Product Overview & Core Advantages
The 71918 CB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Operating under P4 (ABEC-7) tolerance class, this bearing is designed to accommodate primarily axial loads in one direction and combined loads. Its 15° contact angle and preload availability deliver superior system stiffness and precise shaft positioning, making it an ideal solution for high-speed spindles and other demanding machinery where minimal runout and high reliability are critical.
71918 CB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width). |
| CB | Specific internal design and contact angle (15°) optimized for high rigidity and precise operation. |
| P4A | Indicates the tolerance class P4 (ABEC-7), denoting very high dimensional and running accuracy for precision applications. |
71918 CB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The single-row angular contact design with a defined contact angle and available preload provides excellent axial and radial stiffness, minimizing deflection under load for superior machining accuracy.
- Optimized Load Capacity: Engineered to handle significant axial loads in one direction and combined (radial and axial) loads, thanks to the optimized raceway geometry and high-grade chrome steel construction.
- High-Speed Capability: The lightweight phenolic resin cage ensures stability and low friction at the limiting speed of 22,000 rpm, reducing centrifugal forces and heat generation.
- Precision-Grade Performance: Manufactured to P4 tolerance class, this bearing guarantees tight dimensional control and minimal runout, which is essential for applications like machine tool spindles.
71918 CB/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery, including:
- Machine Tool Spindles (milling, grinding, and high-speed machining centers)
- Precision Gearboxes and Drives
- High-Frequency Motors and Spindles
- Medical Equipment (e.g., high-speed dental handpieces)
- Aerospace Actuation Systems
