71940 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71940 ACD/P4ADGB
Basic Information
System of measurement
Metric
Weight
12.2 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
280 mm
Outside diameter tolerance
-0.004mm to 0
Width
76 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
73125 lbf
Radial static load rating
112500 lbf
Limiting speed
16.25 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
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71940 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71940 ACD/P4ADGB is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a preloaded pair (DB arrangement), it excels at handling combined loads—simultaneously supporting substantial radial loads and thrust loads in both directions. Its P4A tolerance class and light preload (Class B) ensure exceptional running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system stiffness are critical.
Model Code Breakdown
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 71940 | Basic Series & Size | Denotes a 719-series bearing with a 200 mm bore, 280 mm OD, and 76 mm width. |
| AC | Contact Angle | A 25° contact angle, optimized for supporting high thrust loads. |
| D | Bearing Arrangement | Indicates two bearings are supplied as a universally matchable (SU) set for a back-to-back (DB) mounting configuration. |
| P4A | Tolerance Class | Signifies super-precision tolerances (equivalent to ISO Class 4), ensuring extremely tight dimensional and running accuracy. |
| DGB | Preload Specification | Specifies a light preload (Class B), which increases bearing rigidity and optimizes performance for high-speed operation. |
71940 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and the use of a matched pair in a back-to-back arrangement create a highly rigid bearing system capable of withstanding combined radial and axial loads from both directions. The phenolic cage contributes to stable operation under high loads.
- Super-Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, OD, and width tolerances, this bearing guarantees minimal runout and vibration, which is paramount for achieving superior surface finishes and machining accuracy.
- Optimized High-Speed Capability: The lightweight phenolic cage and the open design facilitate efficient lubrication and cooling, enabling a high limiting speed of 16,250 rpm. The light preload further minimizes heat generation at high speeds.
- Universal Matchability (SU): This feature allows any two bearings from the same lot to be mounted together as a preloaded pair without the need for selective matching, simplifying installation and ensuring consistent, predictable performance.
71940 ACD/P4ADGB Bearing Typical Application Areas
The 71940 ACD/P4ADGB is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motorized Spindles: Used in PCB drilling and precision engraving.
- Industrial Pumps & Compressors: For applications requiring high-speed and high-accuracy shaft support.
