S71903 ACDGD/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71903 ACDGD/P4A
Basic Information
System of measurement
Metric
Weight
0.017 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.004mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
893 lbf
Radial static load rating
450 lbf
Limiting speed
85 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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S71903 ACDGD/P4A Bearing Product Overview & Core Advantages
The S71903 ACDGD/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy, rigidity, and speed. As a single bearing with a 25° contact angle and Class D Heavy preload, it is engineered to handle significant combined loads (radial and axial) simultaneously while providing exceptional rotational stability. Its compact design, featuring a 17 mm bore and 7 mm width, makes it an ideal choice for high-precision spindles and other high-rigidity applications where space is at a premium.
S71903 ACDGD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| DGD | Duplex arrangement, Face-to-Face (DF) configuration. Indicates the bearing is one of a universally matchable (SU) pair designed to be mounted in a set. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards. The "A" suffix indicates specific tolerances for universal matching. |
S71903 ACDGD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The heavy preload (Class D) and 25° contact angle provide superior stiffness, enabling the bearing to resist deflection under heavy combined loads and ensuring precise shaft positioning.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finishes and machining accuracy.
- Optimized High-Speed Operation: The lightweight phenolic cage reduces centrifugal forces, while the grease lubrication and optimized internal geometry contribute to a high limiting speed of 85,000 rpm.
- Matched Set Configuration: As a Universal Matchable (SU) bearing, it is designed to be paired with an identical bearing to form a pre-configured duplex set, simplifying installation and ensuring optimal preload and performance.
S71903 ACDGD/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For CNC machining centers, grinding spindles, and high-speed milling machines.
- Precision Instrumentation: In measuring devices, optical scanners, and laboratory equipment.
- High-Speed Motors and Drives: Where rotational accuracy and minimal friction are paramount.
