71908 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.11 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
62 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 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° to 110 °C
Radial dynamic load rating
2632 lbf
Radial static load rating
1800 lbf
Limiting speed
30 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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
Price:
$ 313.77
/ each
In Stock
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71908 ACD/P4A Bearing Product Overview & Core Advantages
The 71908 ACD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to simultaneously handle combined radial and axial loads in one direction, this bearing features a P4 (ABEC-7) super-precision tolerance class, ensuring minimal runout and vibration. Its phenolic cage and optimized 25° contact angle contribute to superior high-speed performance and stability, making it an ideal choice for machine tool spindles and other demanding equipment where high rigidity and precision are paramount.
71908 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 12mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high rigid design and enhanced internal geometry. |
| P4A | Indicates a P4 (ABEC-7) super-precision tolerance class with specific running accuracy requirements. |
71908 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row design with a 25° contact angle and P4 tolerance provides exceptional dimensional stability and minimizes deflection under load, crucial for maintaining accuracy in high-speed spindles.
- Optimized Load Capacity: Engineered to support significant combined loads, effectively managing both radial forces and unidirectional axial thrust.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 30,000 rpm. The open design facilitates efficient lubrication management.
- Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring optimal performance from initial startup within the specified temperature range of -30°C to 110°C.
71908 ACD/P4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for applications demanding high speed and accuracy, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes
- Medical and Dental Equipment (e.g., high-speed handpieces)
- Aerospace Actuation Systems
