S71904 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71904 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.037 kg
Tolerance class
P4A
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
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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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S71904 ACDGB/P4A Bearing Product Overview & Core Advantages
The S71904 ACDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing from a Universal Matchable (SU) pair, it is engineered to accommodate combined radial and axial loads simultaneously. Its compact design, featuring a 9 mm width, makes it ideal for space-constrained, high-reliability applications such as precision spindles. Manufactured to the stringent P4A tolerance class, this bearing ensures superior running accuracy and operational consistency.
S71904 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Bearing series and size designation (19mm Bore, 37mm OD, 9mm Width). |
| AC | 25° Contact Angle, optimized for supporting high axial loads. |
| DGB | Duplex arrangement with a Light preload (Class B) for enhanced rigidity and precise shaft positioning. |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy. |
S71904 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex design (DGB) with a light preload significantly increases system stiffness, minimizing deflection under load and ensuring precise rotational alignment.
- Superior Load Capacity: The 25° contact angle enables the bearing to efficiently handle significant combined loads (radial and axial) from multiple directions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel components contribute to smooth operation and a high limiting speed of 75,000 rpm.
- Precision and Longevity: Manufactured to P4A tolerances and pre-lubricated with grease, this bearing delivers consistent, low-vibration performance and a long service life in demanding conditions.
S71904 ACDGB/P4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery requiring utmost precision and speed, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Drilling Heads
- High-Frequency Motors
- Medical and Dental Handpieces
- Aerospace Instrumentation
