71908 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.44 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
6908 lbf
Radial static load rating
7200 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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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71908 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71908 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a matched quadruplex set in a back-to-back arrangement (QBC), this bearing is engineered to handle combined loads with high stability. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and high system rigidity are critical.
71908 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° contact angle, optimized for supporting combined radial and axial loads. |
| P4A | High precision tolerance class exceeding ABEC 7, ensuring minimal dimensional and running deviations. |
| QBCC | Specifies a matched set of four bearings (Quadruplex) in a Back-to-Back (B) arrangement with moderate preload (C) and universal matching (C) for simplified mounting and optimal performance. |
71908 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and moments. The 25° contact angle provides excellent axial load carrying capacity.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic cage, this bearing ensures smooth operation and is suitable for high-speed applications up to 41,000 rpm. The phenolic cage offers low weight and excellent performance at high rotational speeds.
- Optimized for Matched Sets: Bearings are supplied as a pre-matched set of four, ensuring uniform preload (Moderate / Class C) and performance consistency, which simplifies installation and guarantees system reliability.
- Durable Material Construction: Manufactured from chrome steel for both rings and balls, providing high hardness, wear resistance, and a long operational life.
71908 ACD/P4AQBCC Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: Applications in PCB drilling, semiconductor manufacturing, and other high-accuracy machinery.
- High-Frequency Motors: Where high rotational speed and rigidity are required.
- Industrial Pumps & Compressors: For shafts requiring precise axial location and high load capacity.
