71924 ACE/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71924 ACE/P4A
Basic Information
System of measurement
Metric
Weight
1.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
165 mm
Outside diameter tolerance
-0.01mm to 0
Width
22 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
24
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
10102 lbf
Radial static load rating
8550 lbf
Limiting speed
15 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:
$ 1649.09
/ each
In Stock
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71924 ACE/P4A Bearing Product Overview & Core Advantages
The 71924 ACE/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered with a 25° contact angle and P4 (ABEC-7) tolerance class, this bearing is optimized to handle combined loads—significant radial loads and unidirectional axial loads—simultaneously. Its single-row design with a phenolic cage facilitates high-speed operation up to 15,000 rpm, making it an ideal choice for high-performance spindles and precision machinery where minimal runout and high system rigidity are critical.
71924 ACE/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing series and size designation (120mm bore, 165mm OD, 22mm width). |
| ACE | Internal design code specifying a 25° contact angle and optimized internal geometry. |
| P4A | Indicates a P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements for precision applications. |
71924 ACE/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and robust construction provide excellent resistance to deformation under combined loads, ensuring stable performance and long service life.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and enables a high limiting speed of 15,000 rpm.
- Precision Engineering: Manufactured to P4 tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, guaranteeing superior running accuracy and minimal vibration.
- Optimized for Preload: The design is suitable for preload, which eliminates internal clearance, increases system stiffness, and enhances positional accuracy in the assembly.
71924 ACE/P4A Bearing Typical Application Areas
This bearing is predominantly used in high-precision, high-speed applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Advanced Robotics and Automation Systems
