71824 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71824 ACD/P4DGB
Basic Information
System of measurement
Metric
Weight
1.1 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
150 mm
Outside diameter tolerance
-0.004mm to 0
Width
32 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
8.731 mm
Ball quantity
35
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
11408 lbf
Radial static load rating
19125 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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71824 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71824 ACD/P4DGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to support combined loads (radial and axial) simultaneously. Its P4 tolerance class and light preload (Class B) ensure smooth, precise operation, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
71824 ACD/P4DGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71824 | Basic bearing designation | Defines the standard bore (120 mm), outside diameter (150 mm), and width (32 mm) dimensions. |
| AC | Angular Contact design | Optimized geometry with a 25° contact angle to handle significant axial loads in one direction. |
| D | Duplex arrangement | Indicates the bearing is supplied as one half of a pre-mounted, pre-adjusted pair (set of 2). |
| P4 | Tolerance Class | Denotes high precision with extremely tight dimensional and running accuracy tolerances. |
| DGB | Universal Matchable (SU) & Light Preload | Signifies that the two bearings in the set are universally matchable and assembled with a light preload (Class B) for optimal stiffness and performance. |
71824 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex arrangement creates a highly rigid bearing system capable of supporting substantial combined radial and axial loads. The 25° contact angle is specifically engineered for high axial load carrying capacity.
- Superior High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower inertia and smoother operation at high rotational speeds, with a limiting speed of 16,250 rpm.
- Precision Engineering: Manufactured to P4 tolerance class with tight bore and OD tolerances, this bearing ensures minimal vibration and exceptional running accuracy for applications like machine tool spindles.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and long service life under demanding conditions.
71824 ACD/P4DGB Bearing Typical Application Areas
The 71824 ACD/P4DGB is specified for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM applications.
- Industrial Pumps & Compressors: For precise shaft positioning and handling combined loads.
