S71909 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71909 CD/P4AQBCC
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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7605 lbf
Radial static load rating
8550 lbf
Limiting speed
46 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
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
Price available upon request.
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S71909 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S71909 CD/P4AQBCC is a super-precision angular contact ball bearing designed for the most demanding applications. This matched quadruplex set in a back-to-back (QBC) arrangement delivers exceptional system rigidity and stability. Engineered to a P4A tolerance class, it offers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where controlling both radial and axial displacements is critical. Its moderate preload (Class C) ensures optimal performance from installation.
S71909 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71909 | Series designation for a 45 mm bore, 68 mm OD super-precision angular contact ball bearing. |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and high rigidity. |
| P4A | Denotes an ABEC 7 / ISO P4 tolerance class with additional running accuracy requirements for enhanced performance. |
| QBCC | Specifies a Quadruplex (4-bearing) set in a Back-to-Back (QBC) arrangement with Universal (C) matching for precise preload and stiffness. |
S71909 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- Extreme Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and maintains precise shaft positioning, which is crucial for machining accuracy.
- Super-Precision Performance: Manufactured to P4A tolerance standards with tight dimensional control on bore, outside diameter, and width, ensuring minimal runout and vibration for superior finish and accuracy in machined parts.
- Optimized High-Speed Capability: The 15° contact angle (CD) and lightweight phenolic resin cage are engineered to minimize centrifugal forces and friction, enabling stable operation up to the high limiting speed.
- High Load Capacity: The design supports significant combined loads (radial and axial), with high dynamic and static load ratings for long service life under demanding conditions.
- Sealed and Pre-Lubricated: As a sealed bearing with factory-applied grease lubrication, it is protected from contamination and is ready for immediate installation, simplifying maintenance.
S71909 CD/P4AQBCC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications requiring the ultimate in precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy joints and rotary actuators.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
