71814 ACD/P4QBCA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71814 ACD/P4QBCA
Basic Information
System of measurement
Metric
Weight
0.54 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
70 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7762 lbf
Radial static load rating
13500 lbf
Limiting speed
28 X 1000 rpm
Lubrication
Lubricated
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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71814 ACD/P4QBCA Bearing Product Overview & Core Advantages
The 71814 ACD/P4QBCA is a super-precision angular contact ball bearing designed for the most demanding applications. Its defining feature is its Quadruplex Back-to-Back (QBC) matched arrangement, providing exceptional system rigidity and the ability to handle complex combined loads (radial and axial). Manufactured to a P4 tolerance class, this bearing delivers outstanding running accuracy, making it ideal for high-speed spindles and other precision machinery where maximum performance and reliability are critical.
71814 ACD/P4QBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71814 | Bearing series and size designation | Indicates a 70mm bore, 90mm OD, 40mm width bearing. |
| ACD | 25° Contact Angle | Optimized for carrying significant axial loads in combination with radial loads. |
| P4 | Tolerance Class | Denotes high precision with tight dimensional and running accuracy tolerances. |
| QBCA | Quadruplex Back-to-Back, Class A Preload | Specifies a set of four bearings matched for back-to-back mounting with an extra light preload to minimize deflection and maximize system stiffness. |
71814 ACD/P4QBCA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system, drastically reducing axial and radial displacement under load. This is essential for maintaining precision in machining and positioning applications.
- Superior Load Capacity: The 25° contact angle and the multi-bearing setup enable the bearing group to support high combined loads from multiple directions simultaneously.
- High-Speed Capability: The lightweight phenolic cage minimizes centrifugal forces, reducing friction and heat generation. This, combined with the P4 precision and optimized internal geometry, allows for a high limiting speed of 28,000 rpm.
- Pre-optimized Performance: As a factory-matched set, the four bearings are selected and graded to work in perfect unison, ensuring consistent preload and smooth, vibration-free operation.
71814 ACD/P4QBCA Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- High-Frequency Machine Tool Spindles (for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-speed Robotic Drives and Servo Motors
- Aerospace and Defense positioning systems
- Advanced Medical Equipment spindles
