71903 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71903 ACD/P4A
Basic Information
System of measurement
Metric
Weight
0.017 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
17 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.005mm to 0
Width
7 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
3.969 mm
Ball quantity
14
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
893 lbf
Radial static load rating
450 lbf
Limiting speed
75 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:
$ 143.92
/ each
In Stock
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71903 ACD/P4A Bearing Product Overview & Core Advantages
The 71903 ACD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is preloaded and pre-lubricated, making it ideal for machine tool spindles and other high-speed machinery. Its optimized 25° contact angle provides superior performance in handling combined radial and axial loads simultaneously, ensuring reliable operation in demanding conditions.
71903 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a P4 (ABEC-7) tolerance class with specific running accuracy and preload applied. |
71903 ACD/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: The P4 tolerance class and preload ensure minimal runout and high system rigidity, critical for precision machining and high-speed operation.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support significant combined radial and axial loads.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 75,000 rpm. The bearing is pre-lubricated for immediate high-speed performance.
- Durability & Precision: Components made from chrome steel provide excellent wear resistance and dimensional stability, maintaining precision over the bearing's service life.
71903 ACD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Instrumentation
- High-Speed Motors
- Medical and Dental Equipment
- Robotic Arm Joints and Drives
