71909 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71909 ACD/P4ADT
Basic Information
System of measurement
Metric
Weight
0.26 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 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
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4478 lbf
Radial static load rating
4050 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
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
In Stock
Price available upon request.
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71909 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71909 ACD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement features two bearings preloaded against each other, delivering superior high rigidity and the ability to handle significant combined loads. Manufactured to the exacting P4A tolerance class, it is engineered for high-speed operation and precise axial positioning in compact spaces.
71909 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex arrangement. |
| P4A | High precision tolerance class, specifying running accuracy and dimensional tolerances. |
| DT | Duplex Tandem arrangement. Two bearings are mounted in tandem to increase axial load capacity in one direction. |
71909 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle provide exceptional stiffness, enabling the bearing to withstand heavy combined radial and axial loads.
- Precision & High-Speed Performance: The P4A tolerance class ensures minimal runout and vibration. The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 41,000 rpm.
- Optimized Internal Design: Features 23 high-precision chrome steel balls with a diameter of 6.35 mm, balanced for smooth operation and long service life.
- Preload & Stability: Supplied as a preloaded set, eliminating internal clearance and providing immediate, precise rotational performance without the need for complex adjustment during installation.
71909 ACD/P4ADT Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Aerospace Control Systems
- Medical and Dental Handpieces
