71808 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71808 CD/P4DBA
Basic Information
System of measurement
Metric
Weight
0.062 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
52 mm
Outside diameter tolerance
-0.004mm to 0
Width
14 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1755 lbf
Radial static load rating
2205 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
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71808 CD/P4DBA Bearing Product Overview & Core Advantages
The 71808 CD/P4DBA is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a duplex back-to-back (DB) arrangement with an extra light (A) preload, making it ideal for high-speed spindles and precision machinery. Its primary advantage lies in its ability to support combined radial and axial loads simultaneously with high running accuracy and thermal stability, ensuring reliable performance in critical operations.
71808 CD/P4DBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71808 CD/P4DBA is decoded as follows:
- 71808: Basic bearing series, indicating a super-precision, light series angular contact ball bearing with a 40mm bore.
- C: Signifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Indicates the bearing is part of a duplex pair.
- P4: Denotes a P4 tolerance class, signifying very high dimensional and running accuracy per ISO standards.
- DB: Specifies the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity.
- A: Identifies the Extra Light preload class, minimizing friction and heat generation for maximum speed capability.
71808 CD/P4DBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness.
- Super-Precision Performance: Manufactured to P4 tolerance class with a phenolic resin cage, this bearing ensures minimal runout and vibration, which is critical for achieving superior surface finishes and positioning accuracy.
- Optimized High-Speed Capability: The combination of a 15° contact angle, extra light preload, and lightweight phenolic cage allows for a very high limiting speed of 56,000 rpm, reducing centrifugal forces and operational temperature.
- Superior Load Capacity: With a dynamic load rating of 1755 lbf and a static load rating of 2205 lbf, this bearing is engineered to handle significant combined loads reliably.
- Chrome Steel Construction: Both rings and balls are made from high-grade chrome steel, providing excellent wear resistance and long service life under high-stress conditions.
71808 CD/P4DBA Bearing Typical Application Areas
This high-precision bearing is specifically designed for applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Internal and external grinding machines.
- High-Frequency Motors: Spindles for PCB drilling and routing.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
