71901 ACE/PA9ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71901 ACE/PA9ADGB
Basic Information
System of measurement
Metric
Weight
0.02 kg
Tolerance class
PA9A
Seal type
Open
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
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
747 lbf
Radial static load rating
382 lbf
Limiting speed
140 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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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71901 ACE/PA9ADGB Bearing Product Overview & Core Advantages
The 71901 ACE/PA9ADGB is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. As a universal matchable (SU) bearing, it can be mounted in pairs to create a preloaded duplex set capable of withstanding combined radial and axial loads in both directions. Its light preload (Class B) ensures high running accuracy and rigidity, making it ideal for high-speed spindles and precision machinery. The bearing is pre-lubricated and features an open design optimized for controlled lubrication systems.
71901 ACE/PA9ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACE | Specific internal design and contact angle (25°) optimized for high-precision applications. |
| PA9A | Indicates the high-precision tolerance class (PA9A), ensuring minimal dimensional runout and superior rotational accuracy. |
| DGB | Signifies a Universal Matchable (SU) bearing, allowing two identical bearings to be paired in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement to support complex load conditions. |
71901 ACE/PA9ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and light preload (Class B) provide high system rigidity and minimize axial and radial deflection under load, essential for maintaining precision in machining and positioning.
- Superior High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at the high limiting speed of 140,000 rpm. This makes it an excellent high-speed bearing.
- Optimized Load Capacity: Engineered to handle combined loads efficiently. The universal matching feature allows for the creation of bearing sets that significantly increase the overall load-carrying capacity and moment stiffness of the assembly.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
71901 ACE/PA9ADGB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Instrumentation: Measuring devices, optical scanners.
- High-Speed Motors and Drives: Servo motors, turbo-molecular pumps.
- Medical Equipment: Dental handpieces, laboratory centrifuges.
