71918 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACD/P4ADGB
Basic Information
System of measurement
Metric
Weight
1.1 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
36 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
16380 lbf
Radial static load rating
21712 lbf
Limiting speed
15 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
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Product Overview and Core Advantages
The 71918 ACD/P4ADGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a universal matchable (SU) bearing with P4A tolerance class, it delivers superior rotational precision. Its key advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-rigidity applications. The light preload (Class B) ensures smooth operation with minimal deflection, while the phenolic cage contributes to high-speed capability. This bearing arrives pre-lubricated for immediate installation and optimal performance.
71918 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | High ball diameter and quantity for increased load capacity |
| P4A | High-precision tolerance class (exceeding ABEC 7/ISO P4) |
| DGB | Universal Matchable (SU) arrangement in a back-to-back (DB) configuration |
Structural Features and Performance Benefits
- High Rigidity and Load Capacity: The optimized contact angle of 25° and large ball diameter (11.112mm) with 26 balls enable superior resistance to combined loads. The universal matchable (SU) design allows for precise axial preload adjustment when paired, further enhancing system stiffness.
- Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for ultra-precise applications.
- High-Speed Capability: The lightweight phenolic cage reduces centrifugal forces, enabling stable operation at the specified limiting speed of 15,000 rpm.
- Durability and Reliability: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and fatigue life. The open design allows for efficient lubrication management in controlled environments.
71918 ACD/P4ADGB Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Motors and Spindles: Applications demanding low vibration and high rotational speeds.
- Aerospace and Defense Systems: Gyroscopes, radar platforms, and other critical motion control systems.
