71907 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 ACD/P4ADT
Basic Information
System of measurement
Metric
Weight
0.15 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3330 lbf
Radial static load rating
2812 lbf
Limiting speed
56 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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71907 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71907 ACD/P4ADT is a precision angular contact ball bearing configured as a duplex tandem (DT) matched pair. This preloaded arrangement is engineered to deliver exceptional high rigidity and axial load capacity in a compact design. Manufactured to P4A tolerance class, it offers superior running accuracy, making it ideal for applications demanding high-speed operation and precise rotational performance. The phenolic cage and optimized 25° contact angle contribute to its outstanding high-speed capabilities and stability under combined loads.
71907 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact bearing in a Duplex Tandem (DT) preloaded arrangement. This configuration provides maximum axial stiffness and unidirectional load capacity. |
| P4A | Indicates a high precision tolerance class, with enhanced dimensional and running accuracy for demanding applications. |
71907 ACD/P4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and 25° contact angle create a system with very high axial stiffness, capable of handling significant thrust loads. The radial dynamic load rating of 3330 lbf confirms its robust performance under combined loads.
- High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel components enable a high limiting speed of 56,000 rpm, minimizing centrifugal forces and heat generation.
- Precision Engineering: Manufactured to P4A tolerance class with tight bore and OD tolerances, this bearing ensures minimal runout and vibration for superior operational accuracy.
- Optimized Internal Geometry: With 21 balls of 5.556 mm diameter, the bearing provides an optimal balance between load distribution and friction, enhancing its service life.
71907 ACD/P4ADT Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers and grinding spindles requiring extreme rigidity and running accuracy.
- Precision Gearboxes: Applications where precise shaft positioning and high axial load capacity are critical.
- High-Frequency Motors: Spindles for routers and small motors that operate at very high rotational speeds.
- Medical & Laboratory Equipment: Centrifuges and other precision instruments demanding quiet, vibration-free operation.
