71948 ACDGB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71948 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
8.5 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
320 mm
Outside diameter tolerance
-0.004mm to 0
Width
38 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
25.4 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
48600 lbf
Radial static load rating
68625 lbf
Limiting speed
7.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
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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In Stock
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71948 ACDGB/P4A Bearing Product Overview & Core Advantages
The 71948 ACDGB/P4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 25° contact angle and a P4A super-precision tolerance class, making it ideal for spindle systems where minimal runout and high-speed capability are critical. Its Universal Matchable (SU) designation allows for precise preload setting when mounted in a matched arrangement, delivering superior system stiffness and performance under combined radial and axial loads.
71948 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71948 | Basic bearing series and size designation (240mm bore, 320mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| DGB | Duplex arrangement, Ground back faces, and Light preload (Class B). |
| P4A | Indicates a super-precision tolerance class with running accuracy even tighter than ABEC 7. |
71948 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance standards with a phenolic resin cage, this bearing ensures minimal vibration and exceptional running accuracy, which is crucial for high-speed spindles.
- Optimized Load Capacity: The 25° contact angle is engineered to support significant axial loads in one direction while also handling substantial radial loads, making it suitable for combined load applications.
- Superior High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to lower centrifugal forces and reduced friction, enabling a high limiting speed of 7,500 rpm.
- Matched Set Versatility: As a Universal Matchable (SU) bearing, it can be supplied in sets of three for duplex mounting (DB, DF, DT), allowing for precise preload control and enhanced system stability.
71948 ACDGB/P4A Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance machinery, including:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Speed Machining Centers
- Precision Grinding Spindles
- Other industrial equipment requiring high rigidity, high-speed operation, and exceptional rotational accuracy.
