71908 CE/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71908 CE/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.2 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
19
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2700 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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
In Stock
Price available upon request.
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71908 CE/P4ADBA Bearing Product Overview & Core Advantages
The 71908 CE/P4ADBA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this metric bearing features a duplex back-to-back (DB) matched arrangement, providing superior stability and the ability to withstand combined loads (radial and axial). Its extra light preload (Class A) ensures minimal runout and smooth operation at high speeds, making it an ideal choice for high-performance spindles and precision machinery.
71908 CE/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71908 CE/P4ADBA provides detailed technical specifications:
- 71908: Basic series designation, indicating a super-precision, light series angular contact bearing with a 40mm bore.
- C: Represents a 15° contact angle, optimized for high-speed applications with moderate axial loads.
- E: Denotes an optimized internal design, often including a larger ball complement and reinforced shoulders for increased load capacity.
- P4A: Specifies the tolerance class, indicating very high precision for dimensional and running accuracy.
- DB: Indicates the bearings are supplied as a Duplex Back-to-Back matched pair, which increases moment rigidity and operational stability.
- A: Signifies the Extra Light preload level applied to the matched set, reducing vibration and heat generation at high speeds.
71908 CE/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement of two bearings creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision in machining operations.
- Superior Load Capacity: The optimized internal design (E-suffix) with a 19-ball complement and a 15° contact angle provides excellent capacity for both radial and axial loads.
- High-Speed Performance: The lightweight phenolic resin cage ensures low centrifugal forces and minimal friction, while the extra light preload minimizes heat buildup, allowing for a high limiting speed of 56,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore, outside diameter, and width tolerances, this bearing guarantees exceptional running accuracy and consistent performance.
71908 CE/P4ADBA Bearing Typical Application Areas
This bearing is engineered for high-precision, high-speed rotational systems, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Medical Equipment: Dental handpieces, centrifuge rotors.
- Aerospace Systems: Gyroscopes, navigation instruments.
