71905 ACE/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71905 ACE/P4A
Basic Information
System of measurement
Metric
Weight
0.04 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.006mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
16
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1141 lbf
Radial static load rating
596 lbf
Limiting speed
68 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 176.87
/ each
In Stock
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71905 ACE/P4A Bearing Product Overview & Core Advantages
The 71905 ACE/P4A is a single-row angular contact ball bearing engineered for applications demanding exceptional precision and high-speed performance. Positioned in the P4 (ABEC-7) tolerance class, this metric bearing is designed to handle significant axial loads in one direction, combined with radial loads. Its compact design, featuring a 25 mm bore and a 9 mm width, makes it ideal for space-constrained, high-precision machinery. The bearing is supplied with preload and factory lubrication, ensuring immediate high-rigidity operation and long-term reliability.
71905 ACE/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71905 | Standard bearing series designation, indicating a 25 mm bore, 42 mm OD, and 9 mm width. |
| ACE | Internal design code, typically indicating a 25° contact angle and optimized internal geometry for high-speed operation. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific dimensional and running accuracy requirements for precision applications. |
71905 ACE/P4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a lightweight phenolic resin cage, a 25° contact angle, and precision-ground chrome steel components enables a high limiting speed of 68,000 rpm, making it a true high-speed bearing.
- High Rigidity & Axial Load Capacity: The angular contact design and availability of preload provide high system rigidity and excellent capacity for one-direction axial loads, ensuring precise shaft positioning and minimal deflection.
- Precision Performance: Manufactured to P4 tolerance class standards, this bearing guarantees minimal runout and vibration, which is critical for the accuracy of spindles and other precision rotating assemblies.
- Optimized for Performance: With 16 precision balls of 4.762 mm diameter, the bearing offers a high dynamic load rating of 1141 lbf, ensuring long service life under demanding operating conditions.
71905 ACE/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Turbochargers
- Dental and Medical Handpieces
