71912 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 ACD/P4AQBCB
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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 504.2
/ each
In Stock
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71912 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71912 ACD/P4AQBCB is a precision angular contact ball bearing designed for applications demanding extreme rigidity and accuracy. This quadruplex back-to-back (QBC) matched set is preloaded to Light / Class B standards, ensuring minimal deflection under combined loads. Its primary advantage lies in its ability to handle significant radial and axial loads simultaneously, making it an ideal choice for high-precision, high-stiffness spindles and other critical machinery components. Manufactured to a P4A tolerance class, it guarantees exceptional running accuracy and operational reliability.
71912 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a high-precision tolerance class for superior dimensional and running accuracy. |
| QBC | Denotes a Quadruplex Back-to-Back matched arrangement of four bearings. |
| B | Specifies the Light preload level applied to the matched set. |
71912 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Exceptional Rigidity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and minimizes shaft deflection under heavy combined loads.
- High Load Capacity: The 25° contact angle and optimized internal geometry enable high radial dynamic load rating of 11115 lbf and excellent axial load carrying capacity in both directions.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 33,000 rpm. The bearings are pre-lubricated for immediate operation.
- Precision & Reliability: Manufactured from chrome steel and held to P4A tolerance class, this set ensures consistent, high-precision performance with low noise and vibration levels.
71912 ACD/P4AQBCB Bearing Typical Application Areas
This bearing set is engineered for the most demanding applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Machining Centers
- Industrial Pumps and Compressors
- Aerospace and Defense Actuation Systems
