71912 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 ACD/P4AQBCA
Basic Information
System of measurement
Metric
Weight
0.76 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
85 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
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
11115 lbf
Radial static load rating
13162 lbf
Limiting speed
33 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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71912 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71912 ACD/P4AQBCA is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing features a back-to-back quadruplex arrangement (QBC), enabling it to withstand significant combined loads—both radial and axial—simultaneously. Its extra light preload (Class A) ensures minimal deflection under load, making it ideal for high-precision, high-rigidity systems. The phenolic cage and optimized 25° contact angle contribute to stable performance at high rotational speeds.
71912 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High precision tolerance class exceeding ABEC 7 (P4) standards |
| QBC | Quadruplex Back-to-Back matched arrangement for maximum rigidity |
71912 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back configuration provides extremely high system stiffness, minimizing axial and radial play under heavy combined loads.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation up to the limiting speed of 33,000 rpm.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width for superior running accuracy.
- Optimized Load Distribution: The 25° contact angle and quadruplex design efficiently handle complex load patterns in demanding applications.
71912 ACD/P4AQBCA Bearing Typical Application Areas
- High-Precision Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Aerospace Positioning Systems
- Medical Device Rotary Components
- Semiconductor Manufacturing Equipment
