S71908 ACD/P4ADBA
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71908 ACD/P4ADBA
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
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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S71908 ACD/P4ADBA Bearing Product Overview & Core Advantages
The S71908 ACD/P4ADBA is a precision duplex pair of double row angular contact ball bearings designed for applications demanding exceptional rotational accuracy and rigidity. This pre-matched set is configured in a Back-to-Back (DB) arrangement, providing high resistance to overturning moments and enabling it to accommodate combined loads—significant radial and bidirectional axial loads simultaneously. Manufactured to the exacting P4A tolerance class and preloaded to Extra Light (Class A), this bearing is engineered for high-speed operation and superior running accuracy in compact, high-performance machinery.
S71908 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number S71908 ACD/P4ADBA provides detailed technical specifications:
- S7: High-precision bearing series
- 1908: Standard dimension series (19) with 40mm bore (08*5=40mm)
- ACD: Angular Contact design with a 25° contact angle and Duplex Back-to-Back pairing
- P4A: Super-precision tolerance class (exceeding ABEC 7), with specific running accuracy requirements
- DBA: Indicates the bearing is supplied as a pre-adjusted duplex set with Class A preload
S71908 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and supports substantial combined radial and axial loads from both directions.
- Precision & High-Speed Performance: The P4A tolerance class ensures minimal runout and vibration. Combined with the lightweight phenolic resin cage, this enables stable operation at the high limiting speed of 41,000 rpm.
- Optimized Internal Geometry: Featuring a 25° contact angle, 21 precision balls of 6.35mm diameter, and chrome steel construction, the bearing delivers optimal load distribution and long-term reliability.
- Pre-Lubricated & Ready-to-Install: The set is supplied pre-greased and pre-adjusted, simplifying installation and ensuring immediate, optimal performance without additional setup.
S71908 ACD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Gearboxes and High-Frequency Motors where minimal runout and high-speed capability are critical.
- Medical Equipment such as dental handpieces and small-diameter CNC spindles.
- Robotic Arm Joints and Automation Equipment demanding compact, high-stiffness rotary solutions.
