S71911 ACD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71911 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.73 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
52 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.938 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
10980 lbf
Radial static load rating
12375 lbf
Limiting speed
34 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.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S71911 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The S71911 ACD/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 is engineered to deliver exceptional system rigidity and handle significant combined loads (radial and axial). Its P4A tolerance class ensures ultra-high running accuracy, making it ideal for high-speed spindles and other precision machinery requiring maximum performance and reliability.
S71911 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71911 | Series designation for a 55mm bore, 80mm OD super-precision angular contact ball bearing. |
| ACD | Contact Angle of 25° and a Moderate Preload (Class C). |
| P4A | Indicates an ABEC 7 / P4A tolerance class for superior dimensional and running accuracy. |
| QBCC | Specifies a Quadruplex (4-bearing) Back-to-Back (QBC) matched set that is pre-configured for immediate installation. |
S71911 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Extreme Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an exceptionally stiff bearing system capable of supporting high combined radial and axial loads from both directions, minimizing shaft deflection under operation.
- Super-Precision Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finish quality and positioning accuracy.
- Optimized High-Speed Operation: The lightweight and robust phenolic resin cage ensures stable operation at high rotational speeds, contributing to the high limiting speed of 34,000 rpm.
- Ready-to-Install & Sealed: As a factory-matched set with seals and pre-lubrication, it ensures optimal internal preload and alignment, simplifying installation and providing long-term, maintenance-free service.
S71911 ACD/P4AQBCC Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the highest levels of accuracy and surface finish.
- High-Frequency Machining Centers: Where rapid acceleration and deceleration are required.
- Other Precision Rotary Equipment: Such as high-speed pumps and precision measuring instruments.
