71818 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71818 ACD/P4DGC
Basic Information
System of measurement
Metric
Weight
0.56 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
115 mm
Outside diameter tolerance
-0.004mm to 0
Width
26 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
7.144 mm
Ball quantity
31
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
7470 lbf
Radial static load rating
11250 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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71818 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71818 ACD/P4DGC is a precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-lubricated, moderate preload (Class C) duplex set, it is designed to accommodate combined loads—handling significant radial loads and thrust loads in one direction simultaneously. Its P4 tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where high rigidity and operational reliability are paramount.
71818 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD, 26mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is part of a duplex set (two bearings). |
| P4 | Indicates a high-precision tolerance class for superior running accuracy. |
| DGC | Specifies the moderate preload (Class C) and universal matchable (SU) arrangement, allowing bearings to be mounted in back-to-back (DB) or face-to-face (DF) configurations. |
71818 ACD/P4DGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair configuration provides significantly increased stiffness, enabling the bearing to handle substantial combined radial and axial loads with high stability.
- Precision & High-Speed Performance: Manufactured to P4 tolerance standards and featuring a lightweight phenolic cage, this bearing is optimized for high-speed operation up to 15,000 rpm, minimizing friction and heat generation.
- Optimized Internal Geometry: The 25° contact angle and the use of 31 precision balls with a diameter of 7.144 mm are calculated to deliver an optimal balance between thrust capacity and speed capability.
- Universal Matching & Simplified Installation: As a Universal Matchable (SU) set, these bearings are pre-ground to achieve a specific preload when paired, eliminating complex calculations and ensuring consistent, high performance upon installation.
- Durability & Reliability: Constructed from chrome steel for both rings and balls, the bearing offers excellent wear resistance and a long operational life under the specified temperature range of -30°C to 110°C.
71818 ACD/P4DGC Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Grinding Spindles: Where minimal runout and thermal stability are critical.
- High-Frequency Motors: Used in spindles for PCB drilling and other high-RPM applications.
- Medical Equipment: In high-speed centrifuges and dental handpieces.
- Aerospace & Defense Systems: For gyroscopes, radar systems, and other precision instrumentation.
