S71924 ACD/P4AQBCB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71924 ACD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
4.84 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
88 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
43875 lbf
Radial static load rating
77625 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Light / Class B
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/P4AQBCB Bearing Product Overview & Core Advantages
The S71924 ACD/P4AQBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This sealed metric bearing features a back-to-back quadruplex arrangement (QBC), enabling it to handle significant combined loads—both radial and axial—simultaneously. Manufactured to a P4A tolerance class, it offers superior running accuracy and is preloaded (Light / Class B) for optimal stiffness in high-speed operations. Its compact design and high rigidity make it an ideal choice for high-performance machinery where precision and reliability are critical.
S71924 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71924 | Basic bearing designation; 120 mm bore, 165 mm OD, 88 mm width. |
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration. |
| QBC | Quadruplex Back-to-Back matched set arrangement, providing high moment stiffness. |
| Sealed | Integrated seals protect against contamination and retain lubrication. |
S71924 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back (QBC) arrangement of four bearings creates an extremely rigid bearing system, effectively resisting complex moment loads and maintaining shaft alignment under heavy combined loads.
- High Load Capacity: With a radial dynamic load rating of 43,875 lbf and a static load rating of 77,625 lbf, this bearing is engineered to withstand substantial radial and axial forces simultaneously, thanks to its 25° contact angle.
- Optimized High-Speed Performance: The phenolic cage reduces centrifugal forces and friction, contributing to a high limiting speed of 11,000 rpm. The light preload (Class B) further enhances high-speed stability.
- Long-Term Reliability & Simplified Maintenance: The integral seals and factory-applied grease lubrication create a sealed-for-life system, offering protection from contaminants and ensuring consistent performance across a wide temperature range (-30°C to 110°C).
S71924 ACD/P4AQBCB Bearing Typical Application Areas
This bearing is specifically designed for high-precision, high-stiffness applications, including:
- Machine Tool Spindles: For CNC machining centers, grinders, and milling machines requiring high speed and accuracy.
- High-Speed Industrial Pumps & Compressors: Where reliable operation under combined loads is essential.
- Precision Robotics and Automation Systems: Providing the rigidity and accuracy needed for precise positioning.
- Aerospace and Defense Actuation Systems: Demanding high reliability and performance in critical applications.
