S71904/VA9D1
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71904/VA9D1
Basic Information
System of measurement
Metric
Weight
0.037 kg
Tolerance class
P4
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1287 lbf
Radial static load rating
686 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
Preload
Available
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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S71904/VA9D1 Bearing Product Overview & Core Advantages
The S71904/VA9D1 is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a single bearing with universal matching capability (SU), it can be precisely paired with other identical bearings to form optimized sets. Its P4 tolerance class ensures ultra-precise running accuracy, making it ideal for applications where high rigidity and minimal runout are critical. The bearing is preloaded and sealed, arriving ready for installation with pre-applied grease, offering immediate high-speed performance and long-term, maintenance-free operation.
S71904/VA9D1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Indicates a series of high-precision, super-precision angular contact ball bearings. |
| 1904 | Specifies the bearing dimensions: 20mm bore, 37mm outside diameter, 9mm width. |
| /VA9 | Denotes a universally matchable bearing (SU) designed to be paired in sets, in this case, a set of 4 bearings. |
| D1 | Specifies a light preload applied to the bearing, enhancing system rigidity and rotational accuracy. |
S71904/VA9D1 Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a 25° contact angle and light preload (D1), this bearing delivers exceptional stiffness and minimal axial/radial deflection under load, which is crucial for precision spindles.
- Superior Load Capacity: The optimized internal geometry and high-grade chrome steel construction enable it to handle significant combined loads (radial and axial), with a dynamic load rating of 1287 lbf.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground balls and raceways contribute to smooth operation, allowing for a limiting speed of 75,000 rpm.
- Sealed and Lubricated for Life: The bearing is sealed and pre-lubricated with high-performance grease, protecting against contamination and providing reliable, maintenance-free operation within a temperature range of -30°C to 110°C.
S71904/VA9D1 Bearing Typical Application Areas
This bearing is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors and Spindles: Where high rotational accuracy and speed are paramount.
- Medical Equipment: Dental handpieces and small surgical tools.
