71901 ACE/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71901 ACE/P4AQBCB
Basic Information
System of measurement
Metric
Weight
0.04 kg
Tolerance class
P4A
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
24 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
1215 lbf
Radial static load rating
765 lbf
Limiting speed
140 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
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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71901 ACE/P4AQBCB Bearing Product Overview & Core Advantages
The 71901 ACE/P4AQBCB is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a quadruplex back-to-back (QBC) matched set, this bearing is engineered to provide exceptional system rigidity and rotational accuracy. Its P4A tolerance class ensures ultra-precise running, making it ideal for high-speed spindles and other machinery requiring minimal runout and vibration. The light preload (Class B) minimizes deflection under operational loads, contributing to superior positioning accuracy and extended service life.
71901 ACE/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71901 | Basic bearing series and size designation (12mm bore, 24mm OD). |
| ACE | Specific internal design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a super-precision tolerance class with enhanced dimensional and running accuracy. |
| QBC | Signifies the bearing is one of four in a Quadruplex Back-to-Back matched arrangement. |
71901 ACE/P4AQBCB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an extremely rigid bearing system capable of withstanding complex combined loads (radial and axial) from multiple directions, making it exceptionally stable under heavy machining conditions.
- Super-Precision Performance: Manufactured to P4A tolerance standards, this bearing guarantees minimal dimensional variation and superior running accuracy, which is critical for applications requiring high positional repeatability.
- Optimized High-Speed Capability: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 140,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed applications.
- Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring immediate startup and initial operational reliability.
71901 ACE/P4AQBCB Bearing Typical Application Areas
This precision bearing is specifically designed for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- High-Frequency CNC Spindle Units for precision machining centers
- High-Speed Grinding Spindles
- Precision Machine Tool Main Axles
- High-Performance Dental and Medical Handpieces
- Other advanced rotary systems in aerospace and semiconductor manufacturing equipment
