71924 ACD/P4ATBTC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71924 ACD/P4ATBTC
Basic Information
System of measurement
Metric
Weight
3.45 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
165 mm
Outside diameter tolerance
-0.004mm to 0
Width
66 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
35775 lbf
Radial static load rating
58500 lbf
Limiting speed
10 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71924 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 71924 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex back-to-back (TBT) matched set delivers superior performance under combined loads (radial and axial). Its P4A tolerance class ensures ultra-high running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical. The moderate preload (Class C) provides optimal stiffness right from installation, reducing deflection and enhancing system stability.
71924 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71924 ACD/P4ATBTC is decoded as follows:
- 71924: Basic bearing series, indicating a light-weight, high-precision angular contact design with a 120mm bore, 165mm OD, and 66mm width.
- ACD: 25° contact angle, optimized for supporting high axial loads.
- P4A: High precision tolerance class, specifying extremely tight dimensional and running accuracy tolerances.
- TB: Denotes a triplex back-to-back matched arrangement of three bearings.
- T: Indicates the use of a phenolic (resin) cage, which is lightweight and suitable for high-speed operation.
- BC: Specifies a moderate preload (Class C) applied to the matched set.
71924 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads from both directions. This configuration effectively counters moment loads, ensuring precise shaft positioning.
- High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the optimized internal geometry and 25° contact angle contribute to a high limiting speed of 10,000 rpm. The bearing is supplied lubricated for immediate operation.
- Precision & Accuracy: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is paramount for applications requiring high rotational accuracy and surface finish quality.
- Durability: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue life and reliability under demanding operating conditions within a temperature range of -30°C to 110°C.
71924 ACD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Machining Centers
- Industrial Pumps and Compressors
- Other precision rotary equipment requiring maximum rigidity and accuracy.
