71912 ACB/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71912 ACB/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.39 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
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
30
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
3735 lbf
Limiting speed
33 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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
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71912 ACB/P4ADGA Bearing Product Overview & Core Advantages
The 71912 ACB/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy and performance. Engineered to a P4A tolerance class, this bearing is optimized to accommodate combined loads (radial and axial) simultaneously. Its universal matchable (SU) design allows for flexible mounting in various preload configurations, while the extra light preload (Class A) ensures minimal friction and optimal operation in high-speed, high-rigidity systems. This combination makes it an ideal solution for machine tool spindles and other precision equipment.
71912 ACB/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71912 ACB/P4ADGA is decoded as follows:
- 71912: Basic bearing series, indicating a super-precision, light series angular contact bearing with a 60mm bore, 85mm OD, and 26mm width.
- AC: Angular Contact design.
- B: Represents a 40° contact angle (Note: The provided spec indicates 25°. The 'B' suffix is often associated with a 40° angle; please verify the exact specification for this model).
- P4A: High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy tolerances.
- DGA: Indicates the bearing is supplied lubricated with a specific grease suitable for the designated operating temperature range.
71912 ACB/P4ADGA Bearing Structural Features & Performance Benefits
- Super-Precision & High Rigidity: Manufactured to P4A tolerance standards, this bearing ensures exceptional running accuracy and system stability. The phenolic cage and optimized internal geometry contribute to high rigidity, minimizing deflection under load.
- Superior Load Capacity: The angular contact design is inherently capable of handling combined radial and axial loads. The specified 25° contact angle provides a balanced capacity for both load types.
- High-Speed Performance: The lightweight phenolic resin cage is engineered for high-speed operation, reducing centrifugal forces and allowing for a limiting speed of 33,000 rpm. The open design and pre-lubrication facilitate efficient heat dissipation.
- Universal Matching Capability (SU): Bearings marked Universal Matchable (SU) can be mounted in pairs in various configurations (back-to-back, face-to-face, or tandem) to adjust the overall stiffness and moment load capacity of the bearing set.
71912 ACB/P4ADGA Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where extreme accuracy, high speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Used in PCB drilling, semiconductor manufacturing, and other fine machining processes.
- High-Frequency Motors and Robotic Drives.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Aerospace Instrumentation and Navigation Systems.
