S71908 ACD/P4ADGA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71908 ACD/P4ADGA
Basic Information
System of measurement
Metric
Weight
0.23 kg
Tolerance class
P4A
Seal type
Sealed
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
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4275 lbf
Radial static load rating
3600 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Grease
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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S71908 ACD/P4ADGA Bearing Product Overview & Core Advantages
The S71908 ACD/P4ADGA is a super-precision double row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. This sealed bearing features a universal match (SU) design, allowing two bearings to be mounted in any combination to achieve the required preload and stiffness. Its primary advantages include the ability to support combined loads (radial and bidirectional axial loads simultaneously), outstanding high-speed performance, and long-term reliability due to its integral seals and factory-applied grease. Designed with a P4A tolerance class, it is ideal for high-precision, high-reliability spindles and machinery.
S71908 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number S71908 ACD/P4ADGA is decoded as follows:
- S: Super-precision bearing series
- 7: Angular contact ball bearing
- 19: Dimension series code (specific width and outside diameter)
- 08: Bore diameter code (08 x 5 = 40 mm bore)
- ACD: Contact angle of 25° and optimized internal geometry
- P4A: High-precision tolerance class, exceeding ABEC 7/ISO P4 standards
- DGA: Sealed on both sides and pre-lubricated with grease
S71908 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row design and 25° contact angle provide significantly higher radial and axial rigidity compared to single row bearings, enabling stable operation under combined loads.
- Superior High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, while the optimized internal geometry and P4A precision contribute to low vibration and heat generation, allowing for a high limiting speed of 41,000 rpm.
- Sealed & Pre-Lubricated for Longevity: The integral contact seals (DGA) effectively retain grease and exclude contaminants. Factory-filled grease lubrication ensures immediate operation and long service life within the specified temperature range of -30°C to 110°C, making it a maintenance-free solution for many applications.
- Universal Matching: As a Universal Matchable (SU) bearing, any two S71908 ACD/P4ADGA bearings can be paired in a duplex set to achieve precise preload (in this case, Extra light / Class A preload) without selective mounting, simplifying installation and inventory.
S71908 ACD/P4ADGA Bearing Typical Application Areas
This high-precision bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Robotics: High-accuracy joints and arm assemblies.
- Medical Equipment: Dental handpieces and surgical drill spindles.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation instruments.
