71908 CD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 CD/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.22 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
24 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°C to 110 °C
Radial dynamic load rating
4478 lbf
Radial static load rating
3825 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
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
Price:
$ 178.22
/ each
In Stock
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Product Overview and Core Advantages
The 71908 CD/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universal matchable (SU) bearing supplied in a pre-lubricated set of two, it enables simplified assembly into preloaded duplex arrangements (DB, DF, DT) without the need for selective mounting. Its P4A tolerance class and extra light preload (Class A) ensure minimal runout and smooth operation, making it ideal for high-precision spindles and other critical machinery where high rigidity and low vibration are paramount.
71908 CD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 24mm width). |
| CD | Specifies a 15° contact angle, optimized for high-speed operation and combined loads. |
| P4A | Indicates super-precision tolerance class (geometric tolerances tighter than ABEC 7 / ISO P4). |
| DGA | Denotes Universal Matchable (SU) bearings supplied as a set with Extra Light Preload (Class A). |
Structural Features and Performance Benefits
- High Rigidity and Load Capacity: The angular contact design and duplex pairing enable the bearing to withstand significant combined radial and axial loads simultaneously. The phenolic cage contributes to stable operation under high centrifugal forces.
- Superior High-Speed Performance: The 15° contact angle and lightweight phenolic cage are engineered for limiting speeds up to 56,000 rpm, reducing friction and heat generation.
- Exceptional Precision: Manufactured to P4A tolerance class, this bearing guarantees minimal dimensional variation and runout, which is critical for applications requiring extreme positional accuracy.
- Optimized for Duplex Mounting: As a universal matchable (SU) set, the two bearings can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations to achieve the required preload and stiffness without selective shimming.
71908 CD/P4ADGA Bearing Typical Application Areas
This precision angular contact ball bearing is predominantly used in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications demanding the highest levels of accuracy and surface finish.
- High-Frequency Motors and Spindles
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
