71930 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71930 ACD/P4ADGB
Basic Information
System of measurement
Metric
Weight
5 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
150 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
210 mm
Outside diameter tolerance
-0.004mm to 0
Width
56 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
19.05 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
40050 lbf
Radial static load rating
56250 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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:
$ 1781.49
/ each
In Stock
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71930 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71930 ACD/P4ADGB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, this bearing excels in high-speed operations and can accommodate combined loads (radial and axial) simultaneously. Its universal matchable (SU) design allows for flexible mounting arrangements in pairs, providing high system rigidity and operational stability. Preloaded with a Light / Class B preload, it is ideal for high-precision, high-reliability machinery where minimal deflection is critical.
71930 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71930 ACD/P4ADGB provides detailed technical specifications through its suffixes:
- 71930: Basic series designation for a high-precision angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a specific internal design and light preload (Class B).
- P4A: Denotes an extremely high tolerance class, superior to ABEC 7/ISO P4, ensuring exceptional running accuracy.
- DGB: Signifies a Universal Matchable (SU) bearing. Two bearings can be mounted in any configuration (face-to-face, back-to-back, or tandem) without pre-set axial clearance, simplifying assembly and enhancing system performance.
71930 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance standards with a phenolic cage, this bearing ensures minimal runout and high dimensional stability, which is crucial for high-speed and high-precision applications.
- Superior Load Capacity: With a 25° contact angle and robust construction, it effectively handles significant combined radial and axial loads. The dynamic load rating is 40,050 lbf and the static load rating is 56,250 lbf.
- Optimized High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel components contribute to a high limiting speed of 11,000 rpm, reducing centrifugal forces and heat generation.
- Universal Matching Capability (SU): The DGB suffix allows for versatile pairing, enabling designers to create stiff bearing arrangements (like back-to-back for moment load resistance) tailored to specific application needs without custom machining or selective assembly.
71930 ACD/P4ADGB Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance machinery, including:
- Machine Tool Spindles (for milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace and Defense Positioning Systems
