S71907 ACD/P4ADGB
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71907 ACD/P4ADGB
Basic Information
System of measurement
Metric
Weight
0.15 kg
Tolerance class
P4A
Seal type
Sealed
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
Grease
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
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In Stock
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S71907 ACD/P4ADGB Bearing Product Overview & Core Advantages
The S71907 ACD/P4ADGB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it delivers outstanding running accuracy and system rigidity. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously with high precision, making it ideal for high-speed spindles and other critical machinery where minimal runout and thermal stability are paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71907 | Series designation for a super-precision angular contact ball bearing. |
| ACD | Contact angle of 25° and a universal matchable (SU) duplex arrangement. Two bearings are pre-mounted as a set. |
| P4A | Indicates a high-precision tolerance class (superior to ABEC 7 / ISO P4), ensuring extremely tight dimensional and running accuracy. |
| DGB | Signifies a sealed bearing, pre-lubricated with grease, offering protection from contamination and providing maintenance-free operation. |
S71907 ACD/P4ADGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex set configuration and 25° contact angle provide superior stiffness and enable the bearing to support significant combined loads (radial and axial) in both directions.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for achieving high surface finish quality and positional accuracy in machining.
- Optimized High-Speed Operation: The lightweight phenolic resin cage and precision-ground chrome steel components are engineered for stable operation at high rotational speeds, with a limiting speed of 56,000 rpm.
- Maintenance-Free & Long Service Life: The integral seals and factory-applied grease lubrication shield the bearing from contaminants and retain lubricant, ensuring reliable performance over a wide temperature range (-30°C to 110°C) without requiring re-lubrication.
S71907 ACD/P4ADGB Bearing Typical Application Areas
This bearing is specifically engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and optical equipment.
- High-Frequency Motors & Spindles: Where rapid acceleration and deceleration are required.
- Medical Equipment: Dental handpieces and small surgical tools.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and other critical control mechanisms.
