71907 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71907 ACD/P4ADGB
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
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
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
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71907 ACD/P4ADGB Bearing Product Overview & Core Advantages
The 71907 ACD/P4ADGB is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a universally matchable (SU) pair, it excels at handling combined loads, supporting high radial loads and axial loads in one direction simultaneously. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
Model Code Breakdown
The model number 71907 ACD/P4ADGB provides detailed technical specifications:
- 71907: Basic bearing series, indicating a super-precision, light preload angular contact design with a 35mm bore, 55mm OD, and 20mm width.
- ACD: 25° contact angle and specific internal design optimized for high-speed operation.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7, with enhanced running accuracy requirements.
- DGB: Indicates the bearing is one of a Universal Matchable (SU) pair. Two such bearings can be arranged in tandem, back-to-back, or face-to-face configurations to achieve the desired stiffness and load capacity.
71907 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy. The 25° contact angle provides an optimal balance between radial load capacity and axial load capacity, contributing to superior system stiffness.
- Optimized for High Speeds: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for a limiting speed of 56,000 rpm. This makes it exceptionally suited for very high-speed applications.
- Universal Matchability (SU): A key structural advantage. Two 71907 ACD/P4ADGB bearings are universally matchable, meaning they can be paired in any combination (DB, DF, DT) without pre-set preload, offering immense flexibility in machine design and simplifying assembly.
- Superior Material Construction: Made from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under demanding conditions.
71907 ACD/P4ADGB Bearing Typical Application Areas
This high-precision bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
