71908 CD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 CD/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
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1912 lbf
Limiting speed
34 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:
$ 314.08
/ each
In Stock
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71908 CD/P4A Bearing Product Overview & Core Advantages
The 71908 CD/P4A is a single-row angular contact ball bearing engineered for applications demanding high precision and exceptional rotational accuracy. Operating under the P4 (ABEC-7) tolerance class, this bearing is designed to handle significant combined loads, including high radial loads and unidirectional axial loads, thanks to its 15° contact angle. Its compact cross-section, phenolic cage, and preload availability make it an ideal solution for high-speed spindles and other precision machinery where rigidity and minimal runout are critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 40mm bore. |
| C | Denotes a 15° contact angle, optimized for high-speed operation and high radial load capacity. |
| D | Indicates the bearing is manufactured for a matched arrangement (in this case, a single bearing supplied pre-loaded). |
| P4A | Specifies the tolerance class P4 (ABEC-7), ensuring extremely tight dimensional and running accuracy for precision applications. |
71908 CD/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and high system rigidity, which is essential for applications like machine tool spindles.
- Optimized High-Speed Performance: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling a high limiting speed of 34,000 rpm. The 15° contact angle further supports stable operation at high rotational speeds.
- Superior Load Capacity: The optimized internal geometry and use of chrome steel for rings and balls provide a high dynamic load rating of 2790 lbf and static load rating of 1912 lbf, enabling it to withstand significant combined loads.
- Preload Availability: The bearing is supplied with a preload, which increases system stiffness, improves rotational accuracy, and extends bearing life by minimizing axial and radial play.
71908 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Rotary Tables
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
