71812 ACD/P4QBCA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71812 ACD/P4QBCA
Basic Information
System of measurement
Metric
Weight
0.4 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
78 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
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
11925 lbf
Limiting speed
35 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
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In Stock
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71812 ACD/P4QBCA Bearing Product Overview & Core Advantages
The 71812 ACD/P4QBCA is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. As part of a quadruplex back-to-back (QBC) matched set, this bearing is engineered to handle combined radial and axial loads simultaneously. Its P4 tolerance class ensures ultra-precise rotational accuracy, making it ideal for high-speed spindles and other critical machinery. The phenolic cage and optimized 25° contact angle contribute to superior high-speed performance and operational stability.
71812 ACD/P4QBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation (60mm bore, 78mm OD, 40mm width) |
| ACD | Angular Contact Design with a 25° contact angle |
| P4 | High precision tolerance class for superior running accuracy |
| QBC | Quadruplex Back-to-Back arrangement for maximum rigidity |
| A | Extra light preload for optimal stiffness and minimal deflection |
71812 ACD/P4QBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments. This configuration provides superior stability under complex loading conditions.
- Precision Performance: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration, critical for applications requiring high positional accuracy and smooth operation.
- High-Speed Capability: The phenolic cage offers excellent strength-to-weight ratio and operates effectively at the specified limiting speed of 35,000 rpm, making it suitable for demanding high-speed applications.
- Optimized Contact Design: The 25° contact angle provides an ideal balance between radial and axial load capacity, while the chrome steel construction ensures durability and long service life.
71812 ACD/P4QBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers
- High-Speed Machining Centers: Where exceptional rigidity and accuracy are paramount
- Precision Instrumentation: Medical equipment, measuring devices, and optical systems
- Robotics & Automation: High-precision robotic joints and positioning systems
- Aerospace Components: Critical rotating assemblies requiring reliable performance
