S71903 ACDGA/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71903 ACDGA/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
Extra light / Class A
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 ACDGA/P4A Bearing Product Overview & Core Advantages
The S71903 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a single bearing from a universally matchable (SU) set, it excels at simultaneously handling combined radial and axial loads. Its P4A tolerance class and extra light preload (Class A) ensure minimal runout and smooth operation, making it ideal for high-rigidity, high-reliability spindles and precision machinery.
S71903 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1903 | Bore size code (17 mm), Outside Diameter (30 mm), Width (7 mm). |
| AC | Angular Contact design with a 25° contact angle. |
| DGA | Duplex arrangement, ground preload, and specific internal design for universal matching. |
| P4A | High precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy. |
S71903 ACDGA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized angular contact design with a 25° contact angle provides robust support for combined loads, offering high axial and radial stiffness.
- Super-Precision Performance: Manufactured to P4A tolerance standards with an extra light preload, this bearing delivers exceptional running accuracy and minimal vibration for ultra-precise applications.
- High-Speed Capability: The lightweight phenolic resin cage and precision-ground chrome steel components enable a high limiting speed of 85,000 rpm, reducing centrifugal forces and heat generation.
- Ready-to-Install & Matched: As part of a universally matchable (SU) set, these bearings can be arranged in duplex pairs (back-to-back, face-to-face, or tandem) to achieve specific stiffness and moment load requirements without selective mounting.
S71903 ACDGA/P4A Bearing Typical Application Areas
The S71903 ACDGA/P4A is engineered for high-performance applications, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Instrumentation
- High-Frequency Motors
- Medical Equipment Spindles
- Aerospace Actuators and Control Systems
