71808 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71808 ACD/P4DGA
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
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1667 lbf
Radial static load rating
2059 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
In Stock
Price available upon request.
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71808 ACD/P4DGA Bearing Product Overview & Core Advantages
The 71808 ACD/P4DGA 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-set duplex pair, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4 tolerance class and extra light preload (Class A) ensure smooth, quiet operation with minimal vibration, making it ideal for high-reliability, high-rigidity spindles and precision machinery.
71808 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71808 ACD/P4DGA is decoded as follows:
- 71808: Basic series designation for a super-precision, light series angular contact ball bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates the bearing is supplied as a duplex pair (two bearings).
- P4: Denotes a high-precision tolerance class superior to ABEC-7.
- DGA: Specifies the universal matchable (SU) arrangement. Two bearings in this configuration can be mounted in either a back-to-back (DB) or face-to-face (DF) arrangement to optimize rigidity and load handling.
71808 ACD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair (D) design and 25° contact angle provide superior rigidity, enabling the bearing to handle significant combined radial and axial loads with high stability.
- Super-Precision Performance: Manufactured to P4 tolerance class with an extra light preload, this bearing ensures minimal runout and exceptional rotational accuracy for demanding applications.
- Optimized High-Speed Operation: The lightweight phenolic resin cage and precision-ground components contribute to low friction and a high limiting speed of 56,000 rpm, making it suitable for very high-speed spindles.
- Universal Matching Versatility: The Universal Matchable (SU/DGA) feature allows for flexible mounting configurations (DB or DF) without the need for selective assembly, simplifying installation and inventory management.
- Premium Materials: Constructed from chrome steel for both rings and balls, ensuring high durability and long service life under demanding operating conditions.
71808 ACD/P4DGA Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Handpiece Motors
- Aerospace Control Systems
- High-Performance Pumps and Compressors
