S71918 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
S71918 ACB/HCP4A Bearing Product Overview & Core Advantages
The S71918 ACB/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Operating under the P4 (ABEC-7) tolerance class, it delivers exceptional running accuracy. Its key advantage lies in its ability to support combined loads—simultaneously handling significant radial loads and axial loads in one direction. The combination of a ceramic ball material and a phenolic cage contributes to its high-speed capabilities, low friction, and extended service life, making it an ideal choice for high-reliability, high-limiting speed applications.
S71918 ACB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S7 | Bearing Series | Indicates a high-precision angular contact series. |
| 1918 | Size Code | Denotes the bearing dimensions: 90mm bore, 125mm OD, 18mm width. |
| ACB | Contact Angle & Preload | Specifies a 25° contact angle and a specific preload grade for high rigidity. |
| HC | Hybrid Ceramic | Signifies the use of ceramic balls, enhancing speed and reducing heat generation. |
| P4A | Tolerance Class | Confirms adherence to the P4 (ABEC-7) precision standard for superior accuracy. |
S71918 ACB/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row angular contact design, combined with a defined 25° contact angle and factory-set preload, provides excellent stiffness and minimizes axial and radial runout, which is critical for precision spindles.
Superior Load Capacity: Engineered to handle combined loads effectively, with a radial dynamic load rating of 3780 lbf and a static load rating of 3735 lbf, ensuring reliable performance under demanding conditions.
Enhanced High-Speed Performance: The hybrid ceramic balls (silicon nitride) are lighter and harder than steel, reducing centrifugal forces and friction. This, combined with the lightweight, self-lubricating phenolic cage, enables a high limiting speed of 15,000 rpm.
Sealed and Lubricated for Life: As a sealed and pre-lubricated unit, the bearing is protected from contamination and is designed for long-term, maintenance-free operation within its specified temperature range.
S71918 ACB/HCP4A Bearing Typical Application Areas
The S71918 ACB/HCP4A is ideally suited for high-performance machinery where precision, speed, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors and Spindles: Where low inertia and high rotational accuracy are required.
- Medical and Dental Equipment: High-speed handpieces and scanners.
- Aerospace and Defense Systems: Gyroscopes, radar systems, and other precision instruments.
