S71924 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71924 ACD/P4ADBA
Basic Information
System of measurement
Metric
Weight
2.42 kg
Tolerance class
P4A
Seal type
Sealed
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
44 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
26775 lbf
Radial static load rating
38925 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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
Price available upon request.
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S71924 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S71924 ACD/P4ADBA is a super-precision double row angular contact ball bearing designed for applications demanding exceptional rotational accuracy, high rigidity, and reliable performance under combined loads. This metric bearing features a duplex back-to-back (DB) arrangement and an extra light preload (Class A), making it ideal for high-speed spindles and other precision machinery. Its sealed design and phenolic cage contribute to its high-speed capability and long service life in demanding environments.
S71924 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number S71924 ACD/P4ADBA is decoded as follows:
- S7: High-precision bearing series
- 1924: Dimension series; 19 indicates the series, 24 indicates a 120mm bore diameter
- AC: Angular Contact design
- D: Duplex (Two bearings as a set)
- P4A: High precision tolerance class (exceeding ABEC 7/ISO P4)
- DB: Duplex Back-to-Back mounting arrangement
- A: Extra light preload class
S71924 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement provides superior rigidity and moment load capacity, ensuring stable shaft positioning and minimizing deflection under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and double row design, this bearing efficiently handles significant radial loads and bidirectional axial loads simultaneously.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry enable a high limiting speed of 11,000 rpm. The grease lubrication is suitable for this high-speed range.
- Exceptional Precision: Manufactured to a P4A tolerance class, it guarantees extremely tight running accuracy and minimal rotational vibration, which is critical for precision applications.
- Sealed and Ready-to-Use: The sealed design protects against contamination and retains lubrication, offering a maintenance-free solution within its specified temperature range of -30°C to 110°C.
S71924 ACD/P4ADBA Bearing Typical Application Areas
This super-precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles
- High-Frequency Motors
- Medical Equipment Spindles
- Aerospace Positioning Systems
