71818 ACD/HCP4
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71818 ACD/HCP4
Basic Information
System of measurement
Metric
Weight
0.25 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
115 mm
Outside diameter tolerance
-0.008mm to 0
Width
13 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° to 110 °C
Radial dynamic load rating
4568 lbf
Radial static load rating
5625 lbf
Limiting speed
18 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1131.54
/ each
In Stock
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71818 ACD/HCP4 Bearing Product Overview & Core Advantages
The 71818 ACD/HCP4 is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. As a P4 (ABEC-7) tolerance class bearing, it delivers exceptional running accuracy and dimensional stability. Its key advantage lies in its ability to accommodate combined loads (radial and axial) simultaneously, making it ideal for high-speed spindles and precision machinery where high rigidity and minimal runout are critical. The combination of a ceramic ball material and a phenolic cage contributes to its high-speed capabilities and reduced weight.
71818 ACD/HCP4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD, 13mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high load capacity internal design. |
| HC | Indicates the use of Hybrid Ceramic balls (Ceramic balls with steel rings). |
| P4 | Specifies the P4 (ABEC-7) tolerance class for high-precision applications. |
71818 ACD/HCP4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized internal geometry and 25° contact angle provide excellent resistance to combined radial and axial loads, ensuring stable operation under demanding conditions.
- Superior High-Speed Performance: The phenolic resin cage offers low weight and excellent acceleration characteristics, while the ceramic (Si3N4) balls reduce centrifugal forces and friction, enabling a high limiting speed of 18,000 rpm.
- Precision & Longevity: Manufactured to P4 tolerance class, this bearing guarantees minimal vibration and high running accuracy. The hybrid ceramic design provides inherent electrical insulation and superior resistance to wear and degradation.
- Preload & Matched Arrangements: The bearing is supplied with a preload, enhancing system stiffness and rotational accuracy from the start. It is designed as a single unit for matched arrangements in pairs (DB, DF, DT) to handle complex load scenarios.
71818 ACD/HCP4 Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics and Automation Equipment
- High-Frequency Motors and Spindle Drives
- Medical Equipment (e.g., Dental handpieces, Centrifuges)
- Aerospace & Defense Instrumentation and Control Systems
