S71909 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71909 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
0.54 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7312 lbf
Radial static load rating
8100 lbf
Limiting speed
41 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
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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S71909 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S71909 ACD/P4AQBCA is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As part of a matched quadruplex set in a back-to-back (QBC) arrangement, this bearing is engineered to handle combined radial and axial loads simultaneously with exceptional accuracy and stability. Its P4A tolerance class and extra light preload (Class A) ensure minimal runout and vibration, making it ideal for machine tool spindles and other precision machinery where rotational accuracy is paramount.
S71909 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Advantage |
|---|---|---|
| ACD | Angular Contact Design, 25° contact angle | Optimized for high axial load capacity and rigidity. |
| P4A | ABEC 7 / ISO P4A Tolerance Class | Guarantees ultra-precision running accuracy for high-speed spindles. |
| QBC | Quadruplex Back-to-Back Arrangement | Provides maximum system rigidity and moment load capacity. |
S71909 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) matched set configuration creates an extremely rigid bearing system capable of withstanding heavy combined loads and significant moment loads, which is critical for maintaining machining accuracy.
- Super-Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This results in superior running accuracy, reduced vibration, and enhanced performance at high speeds.
- Optimized High-Speed Operation: The phenolic resin cage is lightweight and exhibits excellent performance at high rotational speeds, contributing to the bearing's high limiting speed of 41,000 rpm. The 25° contact angle provides a balanced capability for both radial and axial loads at high speeds.
- Sealed & Pre-Lubricated: The bearing is sealed and pre-lubricated with grease, offering protection against contamination and providing reliable, maintenance-free operation within its specified temperature range of -30°C to 110°C.
S71909 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is specifically engineered for high-precision, high-speed applications, including:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles.
- High-Speed Drives: Precision spindles for routers and engraving machines.
- Precision Instrumentation: High-accuracy measuring devices and rotary tables.
- Aerospace & Defense Systems: Gyroscopes and other critical rotational components.
