S71901 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71901 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
0.011 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
12 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
24 mm
Outside diameter tolerance
-0.004mm to 0
Width
6 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
13
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
574 lbf
Radial static load rating
266 lbf
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
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In Stock
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S71901 ACDGB/P4A Bearing Product Overview & Core Advantages
The S71901 ACDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy and performance. As a single bearing that is Universal Matchable (SU), it can be precisely paired with a second bearing to form a pre-loaded duplex set, offering exceptional system rigidity and running accuracy. Its key characteristics include a 25° contact angle for handling significant combined loads (radial and axial), a Light preload (Class B) for reduced noise and vibration, and a P4A tolerance class for superior dimensional and running precision. This compact, sealed bearing is pre-lubricated for long-term, maintenance-free operation in high-speed scenarios.
S71901 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71901 ACDGB/P4A is decoded as follows:
- S7: High-precision bearing series with a 25° contact angle.
- 1901: Dimension series; 1 (Extra Light) for width series 9 and bore code 01 (12mm bore).
- AC: Angular Contact design with a 25° contact angle.
- D: The bearing is a Universal Matchable (SU) design. Two bearings can be paired in a "back-to-back" (DB) or "face-to-face" (DF) arrangement to support moment loads.
- GB: Specifies a Light preload (Class B).
- /P4A: Denotes a super-precision tolerance class with enhanced running accuracy requirements.
S71901 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The P4A tolerance class ensures minimal dimensional variation and extremely smooth operation, which is critical for high-precision spindles. The Universal Matchable (SU) feature allows for the creation of a stiff, pre-loaded duplex set that resists operational deflection.
- Superior Load Capacity: The 25° contact angle is optimized to handle substantial combined radial and axial loads simultaneously, making it suitable for complex loading conditions.
- Optimized for High-Speed Operation: The phenolic resin cage is lightweight and robust, reducing centrifugal forces and allowing for higher limiting speeds. The grease lubrication and sealed design ensure consistent performance at these elevated speeds.
- Maintenance-Free and Long-Lasting: The integral seals protect against contamination and retain the high-performance grease lubricant, enabling reliable operation across the specified temperature range of -30°C to 110°C without re-lubrication.
S71901 ACDGB/P4A Bearing Typical Application Areas
The S71901 ACDGB/P4A is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical scanners.
- High-Frequency Spindles: PCB drilling and routing machines.
- Robotics: High-accuracy joints and arm assemblies.
