S71908 ACD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71908 ACD/P4ADBC
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
Moderate / Class C
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/P4ADBC Bearing Product Overview & Core Advantages
The S71908 ACD/P4ADBC is a precision double-row angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This high-precision bearing features a duplex back-to-back (DB) arrangement, providing superior stability and the ability to support combined loads (significant radial and bidirectional axial loads) simultaneously. Manufactured to P4A tolerance class and preloaded for moderate stiffness, it delivers reliable performance in high-speed, high-rigidity applications. Its compact design and sealed construction make it an ideal choice for machine tool spindles and other precision machinery.
S71908 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71908 | Basic bearing series, indicating a 40mm bore, 62mm OD, and 24mm width. |
| ACD | Angular Contact, Duplex arrangement (specifically Back-to-Back/DB). |
| P4A | High precision tolerance class, exceeding ABEC 7 standards. |
| DBC | Duplex Back-to-Back configuration with Moderate Preload (Class C). |
S71908 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists overturning moments, making it exceptionally stable under combined loads.
- Superior Load Capacity: The double-row angular contact design and 25° contact angle enable it to handle high radial loads and substantial bidirectional axial loads simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, contributing to a high limiting speed of 41,000 rpm. The standard grease lubrication is optimized for this performance.
- Precision & Longevity: Manufactured to a P4A tolerance class with tight dimensional controls, this bearing ensures running accuracy and consistent performance. The sealed design protects against contamination.
S71908 ACD/P4ADBC Bearing Typical Application Areas
This bearing is engineered for high-performance applications where precision, speed, and rigidity are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, indexing tables, and rotary actuators.
- High-Frequency Motors & Spindles: Applications requiring minimal runout and high rotational accuracy.
- Medical & Laboratory Equipment: Centrifuges and other precision instruments.
