71924 ACD/P4ATGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71924 ACD/P4ATGA
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
Universal Matchable (SU)
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71924 ACD/P4ATGA Bearing Product Overview & Core Advantages
The 71924 ACD/P4ATGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Operating under the P4A tolerance class, this bearing is engineered to handle combined loads efficiently, offering high performance in demanding environments. Its universal matchable (SU) design allows for flexible mounting arrangements in sets, while the extra light preload (Class A) ensures smooth operation with minimal friction. The combination of a phenolic cage and optimized 25° contact angle contributes to its superior high-speed capabilities and operational stability.
71924 ACD/P4ATGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71924 ACD/P4ATGA provides detailed technical specifications through its suffixes:
- 71924: Basic model number indicating a 120mm bore, 165mm OD, and 66mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a duplex (two single bearings) configuration, though this specific bearing is universal matchable for duplex sets.
- P4A: Denotes a very high precision tolerance class, exceeding ABEC 7 standards, for exceptional running accuracy.
- T: Indicates the cage material is Phenolic (fiberglass reinforced).
- GA: Specifies a special preload class (Extra Light / Class A).
71924 ACD/P4ATGA Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance standards with a universal matchable (SU) design, this bearing provides exceptional dimensional stability and rotational accuracy, essential for high-precision spindles.
- Superior Load Capacity: The 25° contact angle and robust construction enable it to support significant combined radial and axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the open design facilitates efficient lubrication, allowing for a high limiting speed of 10,000 rpm.
- Durability and Reliability: Components made from chrome steel and a precisely engineered ball complement (28 balls of 14.288mm diameter) ensure long service life and consistent performance within a temperature range of -30°C to 110°C.
71924 ACD/P4ATGA Bearing Typical Application Areas
This high-precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Industrial Pumps and Compressors: Where reliability and speed are critical.
- High-Frequency Motors and Spindles: Applications requiring minimal runout and vibration.
- Aerospace and Defense Systems: Actuators, guidance systems, and other precision mechanisms.
