71918 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71918 ACD/P4ADBC
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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71918 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 71918 ACD/P4ADBC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement provides superior stability and is preloaded to Class C (Moderate), making it ideal for systems where high rotational accuracy and minimal axial/radial deflection are critical. Its P4A tolerance class ensures ultra-precise dimensional and running accuracy, while the phenolic cage and optimized 25° contact angle contribute to excellent high-speed performance and the ability to handle combined radial and axial loads simultaneously.
71918 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact, Duplex arrangement. Specifically denotes a Back-to-Back (DB) configuration. |
| P4A | Indicates a very high precision tolerance class, exceeding ABEC 7 standards, for superior running accuracy and dimensional stability. |
| DBC | Specifies the moderate preload (Class C) applied to the duplex set, which increases system rigidity and optimizes bearing performance under operational conditions. |
71918 ACD/P4ADBC 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 misalignment, ensuring precise shaft positioning.
- Superior Load Capacity: The 25° contact angle and duplex design enable the bearing to handle significant combined loads (radial and axial) from both directions simultaneously.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for a high limiting speed of 15,000 rpm. The bearing is supplied lubricated for immediate operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional tolerances on bore, outside diameter, and width, guaranteeing consistent, high-precision performance in the most demanding applications.
71918 ACD/P4ADBC Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where precision and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Rotary Axes
