71901 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71901 ACDGC/P4A
Basic Information
System of measurement
Metric
Weight
0.01 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
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
Limiting speed
140 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71901 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71901 ACDGC/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of rotational accuracy and rigidity. As a single bearing that is Universal Matchable (SU), it can be precisely paired with a second identical bearing to form a preloaded duplex set, delivering exceptional performance under combined loads. Its P4A tolerance class and moderate preload (Class C) make it ideal for high-speed spindles and other precision machinery where minimal runout and high system stiffness are critical.
71901 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71901 | Basic bearing series and size designation. | Identifies a super-precision, small-bore angular contact bearing. |
| AC | Angular Contact design with a 25° contact angle. | Optimized for carrying combined (radial and axial) loads simultaneously. |
| D | High-Grade Phenolic Resin Cage material. | Provides excellent strength-to-weight ratio, low friction, and is suitable for high-speed operation. |
| GC | Internal clearance/preload group indicating Moderate Preload (Class C). | Enhances system rigidity and positioning accuracy for demanding applications. |
| P4A | Tolerance class exceeding ABEC 7/ISO P4. | Guarantees ultra-precise dimensions and runout tolerances for superior rotational accuracy. |
71901 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support significant combined loads. When used in a universally matched set, the preload configuration delivers exceptionally high rigidity to the spindle or shaft system.
- Super-Precision High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, while the P4A manufacturing tolerances ensure smooth operation. This combination allows for a very high limiting speed of 140,000 rpm, making it suitable for ultra-high-speed applications.
- Optimized Internal Design: With 13 high-precision chrome steel balls of 3.175 mm diameter, the bearing achieves an optimal balance between load capacity and friction, contributing to its high-speed capability and long service life.
- Universal Matchability: The SU (Universal Matchable) designation means individual 71901 ACDGC/P4A bearings can be selectively paired to achieve specific preload levels (face-to-face, back-to-back, or tandem) without the need for selective grinding, simplifying inventory and assembly.
71901 ACDGC/P4A Bearing Typical Application Areas
This bearing is engineered for the most demanding precision applications, including:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Main Shafts
- High-speed Robotic Drives and Rotary Tables
- Aerospace Gyroscopes and Instrumentation Motors
