71918 ACD/HCP4ADBC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71918 ACD/HCP4ADBC
Basic Information
System of measurement
Metric
Weight
0.94 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
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71918 ACD/HCP4ADBC Bearing Product Overview & Core Advantages
The 71918 ACD/HCP4ADBC is a precision duplex angular contact ball bearing set designed for demanding applications requiring exceptional rigidity and accuracy. This metric system bearing features a Back-to-Back (DB) matched arrangement of two bearings, enabling it to withstand combined loads (significant radial and bidirectional axial loads) simultaneously. Manufactured to a P4A tolerance class, it offers high running accuracy and is preloaded to Moderate / Class C for optimal stiffness and minimal deflection under load. The use of ceramic balls and a phenolic cage contributes to its high-speed capability and reduced weight, making it ideal for high-precision, high-reliability machinery.
71918 ACD/HCP4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a specific contact angle of 25°. |
| HC | Hybrid Ceramic, indicating the use of ceramic balls for enhanced speed and performance. |
| P4A | Specifies the high precision tolerance class for superior running accuracy. |
| DB | Duplex Back-to-Back arrangement, providing high moment rigidity. |
| C | Indicates the Moderate preload level applied to the bearing set. |
71918 ACD/HCP4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity and Stability: The duplex Back-to-Back (DB) arrangement creates a robust, preloaded system that significantly increases axial and radial stiffness, minimizing shaft deflection under heavy combined loads.
- Superior High-Speed Performance: The combination of lightweight phenolic resin cage and ceramic balls (Silicon Nitride) reduces centrifugal forces and rolling friction, allowing for a high limiting speed of 15,000 rpm. This also results in lower operating temperatures.
- Enhanced Load Capacity: With a 25° contact angle and a high count of 26 balls, this bearing set offers excellent dynamic and static load ratings (16,380 lbf radial dynamic, 21,712 lbf radial static), making it suitable for applications with significant thrust and radial forces.
- Precision Operation: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, ensuring smooth, quiet, and precise rotation essential for high-accuracy equipment.
71918 ACD/HCP4ADBC Bearing Typical Application Areas
This high-performance duplex bearing set is ideally suited for:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Robotics: High-accuracy robotic arms and joints where repeatability and stiffness are critical.
- High-Frequency Spindles: Applications in PCB drilling and precision engraving.
- Advanced Medical Equipment: Imaging devices and surgical tool drives.
- Aerospace Actuation Systems: Control surface actuators and other high-reliancy mechanisms.
