71824 ACD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71824 ACD/P4DBA
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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
Price available upon request.
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71824 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71824 ACD/P4DBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4 tolerance class bearing features a back-to-back (DB) matched arrangement and an extra light preload (Class A), making it ideal for high-speed spindles and precision machinery. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously while maintaining superior rotational accuracy and system stiffness in a compact design.
71824 ACD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71824 ACD/P4DBA is decoded as follows:
- 71824: Basic bearing series, indicating a metric, angular contact design with a 120mm bore.
- A: Denotes a 25° contact angle, optimized for supporting high axial loads.
- C: Indicates a modified internal design for enhanced performance.
- D: Specifies the bearing is supplied as part of a duplex (matched) pair.
- P4: The tolerance class, signifying very high precision per ISO standards.
- DB: The matched arrangement is Back-to-Back, providing high moment rigidity.
- A: Indicates an Extra Light preload is applied to the matched set.
71824 ACD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The duplex back-to-back (DB) arrangement of two bearings creates a wide effective spread, significantly increasing the system's resistance to moment loads and enhancing overall rigidity.
- Superior Precision: Manufactured to a P4 tolerance class, this bearing ensures minimal runout and exceptional dimensional accuracy, which is critical for high-speed and high-precision applications.
- Optimized Load Capacity: The 25° contact angle and robust construction, featuring 35 chrome steel balls, provide excellent capacity for handling combined loads.
- High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 16,250 rpm and stable operation at high rotational velocities.
- Pre-Configured Performance: The matched set comes with a pre-applied Extra Light (Class A) preload, eliminating the need for complex on-site adjustment and ensuring immediate, optimal performance upon installation.
71824 ACD/P4DBA Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are paramount. Typical uses include:
- Machine Tool Spindles (e.g., CNC milling, grinding, and turning centers)
- High-Frequency Motor Spindles
- Precision Gearboxes
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
