71910 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71910 ACD/P4ADT
Basic Information
System of measurement
Metric
Weight
0.26 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
50 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
72 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
25
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4680 lbf
Radial static load rating
4410 lbf
Limiting speed
46 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
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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71910 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71910 ACD/P4ADT is a precision angular contact ball bearing supplied as a duplex tandem (DT) pair with P4A tolerance class. This matched set configuration is engineered to deliver exceptional high rigidity and axial load capacity in a single direction, making it ideal for applications demanding extreme rotational accuracy and high reliability. The bearings are pre-lubricated and feature an open design, optimized for high-speed operation and controlled preload conditions.
71910 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71910 | Basic bearing series, indicating a high-precision, light series angular contact bearing with a 50mm bore. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex bearing (two single bearings mounted together). |
| P4A | High precision tolerance class, superior to ABEC-7, ensuring minimal runout and vibration. |
| DT | Duplex Tandem arrangement. The two bearings are matched to share loads in the same direction, maximizing axial rigidity and load capacity. |
71910 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement combines two bearings to create an exceptionally rigid unit capable of supporting high combined loads, with a radial dynamic load rating of 4680 lbf and a static load rating of 4410 lbf.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to low friction and a high limiting speed of 46,000 rpm, qualifying it as a true high-speed bearing.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, ensuring predictable performance and ease of installation in precision assemblies.
- Preload & Thermal Stability: Supplied as a pre-matched set, this bearing pair is ready for preload application, enhancing system stiffness. The phenolic cage and chrome steel construction provide stable operation within a temperature range of -30°C to 110°C.
71910 ACD/P4ADT Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance machinery requiring superior accuracy and speed. Common applications include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Spindles for PCB drilling and routing
- High-frequency Electric Motors
- Aerospace & Defense instrumentation and control systems
