71907 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 ACD/P4ADBA
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 Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
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:
$ 162.35
/ each
In Stock
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71907 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71907 ACD/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched pair configuration provides superior high rigidity and stability, enabling it to withstand combined loads (radial and axial) effectively. Manufactured to P4A tolerance class, it ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high reliability are critical.
71907 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex (two-bearing) set. |
| P4A | Specifies the high-precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Denotes the Back-to-Back mounting arrangement of the matched pair. |
| A | Signifies an Extra Light preload for minimal friction and optimal high-speed performance. |
71907 ACD/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring precise alignment and high rigidity under operation.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant combined radial and axial loads simultaneously, making it suitable for applications with complex loading conditions.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the extra light preload (A) minimizes friction and heat generation, collectively supporting a high limiting speed of 56,000 rpm.
- Precision Engineering: Manufactured from high-grade chrome steel for rings and balls, and held to P4A tolerance class, this bearing guarantees exceptional dimensional accuracy, smooth operation, and long service life in precision applications.
71907 ACD/P4ADBA Bearing Typical Application Areas
This precision bearing is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Positioning Systems
