S71918 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71918 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.48 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.009mm 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° to 110 °C
Radial dynamic load rating
9945 lbf
Radial static load rating
10800 lbf
Limiting speed
10 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:
$ 1309.27
/ each
In Stock
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S71918 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71918 ACD/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This sealed single bearing features a 25° contact angle and is supplied with a preload, delivering superior running accuracy and high rigidity. Its compact design, combined with a phenolic cage and ceramic balls, enables high-speed operation and reliable performance under combined radial and axial loads, making it ideal for high-reliability precision machinery.
S71918 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71918 | Basic bearing designation, indicating a metric series angular contact ball bearing. |
| ACD | Signifies a 25° contact angle and that the bearing is supplied with a preload for high rigidity and precise operation. |
| HC | Indicates the use of a hybrid ceramic construction (Ceramic balls with steel rings). |
| P4 | Denotes a high-precision tolerance class (ABEC-7 / ISO P4), ensuring minimal runout and vibration. |
| Sealed / Lubricated | The bearing is sealed and comes pre-lubricated, offering protection from contaminants and extended service life. |
S71918 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and factory-set preload provide high system stiffness and excellent running accuracy, critical for applications with minimal deflection.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic (hybrid) balls significantly reduces centrifugal forces, enabling a high limiting speed of 10,000 rpm.
- Extended Service Life and Reliability: Ceramic balls offer superior wear resistance, lower friction, and insensitivity to thermal expansion. The integral seals retain lubrication and exclude contaminants, ensuring long-term, maintenance-free operation.
- High Load Capacity: With a dynamic load rating of 9945 lbf and a static load rating of 10800 lbf, this bearing is engineered to handle significant combined loads (radial and axial) simultaneously.
S71918 ACD/HCP4A Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where high speed, rigidity, and accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Medical Equipment: Such as dental handpieces and high-speed centrifuges.
- Semiconductor Manufacturing Equipment: Including wafer handlers and stepper stages.
- Aerospace & Defense Systems: For gyroscopes, radar systems, and other precision instruments.
- High-Frequency Motors and Spindles: Demanding low vibration and thermal stability.
