71918 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71918 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.47 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
18 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
9945 lbf
Radial static load rating
10800 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 377.65
/ each
In Stock
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71918 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 71918 ACDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing is distinguished by its P4A super-precision tolerance class and ceramic ball construction, enabling superior high-speed capability and extended service life. Its 25° contact angle is optimized to handle significant combined loads, including high radial and one-directional axial loads. As a Universal Matchable (SU) bearing, it can be pre-set and supplied in precisely matched sets of three, facilitating simplified installation and achieving optimal system rigidity and running accuracy in spindle assemblies.
71918 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Enhanced internal geometry for high-speed operation. |
| GA | Indicates a specific preload group: Extra light (Class A). |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls with steel rings. |
| P4A | The tolerance class, denoting super-precision levels for both dimensional and running accuracy. |
71918 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperatures, and provides electrical insulation. This results in dramatically higher limiting speeds (15,000 rpm) and longer lubrication life compared to all-steel bearings.
- Precision & Rigidity: Manufactured to P4A tolerance class standards, this bearing ensures minimal runout and vibration, which is critical for maintaining high-precision in machining and rotational applications. The phenolic cage contributes to smooth operation at high speeds.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support combined loads, offering a robust solution for applications with significant radial and axial force components.
- Universal Matching (SU): Bearings are universal matchable, allowing any bearing to be mounted adjacent to any other without preload variation. This simplifies assembly and ensures consistent, high system rigidity in multi-bearing arrangements.
71918 ACDGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where speed, precision, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors and turbomachinery.
- Medical Equipment: Dental handpieces and imaging device rotors.
- Aerospace auxiliary systems and instrumentation.
