S71918 CD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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S71918 CD/HCP4ADT Bearing Product Overview & Core Advantages
The S71918 CD/HCP4ADT is a super-precision duplex tandem angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. This matched set of two bearings delivers exceptional rotational accuracy and stability. Its core advantages include the ability to handle significant combined loads (radial and axial), superior running accuracy due to its P4A tolerance class, and outstanding high-speed performance enabled by its ceramic balls and phenolic cage. This configuration is ideal for spindles requiring maximum stiffness and positional accuracy.
S71918 CD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series with specific internal geometry for optimal performance.
- 1918: Standard size designation (90mm bore, 125mm OD, 36mm width).
- CD: Duplex Tandem (DT) arrangement. Two bearings are mounted together to primarily handle axial loads in one direction, doubling the axial rigidity.
- HC: Denotes the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4A: Tolerance class exceeding ABEC 7/ISO P4, indicating extremely tight dimensional and running accuracy tolerances.
- Sealed / Grease Lubrication: The bearing is supplied sealed and pre-greased, offering a maintenance-free, long-service-life solution.
S71918 CD/HCP4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem (DT) arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined loads. The 15° contact angle is optimized for high axial load capacity.
Superior High-Speed Performance: The combination of ceramic balls (lighter, harder, and more dimensionally stable than steel) and a lightweight phenolic resin cage significantly reduces centrifugal forces, enabling a high limiting speed of 15,000 rpm. This also reduces operating temperature and extends bearing life.
Precision & Longevity: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for precision machining. The integral seals protect the high-performance grease from contamination, ensuring consistent performance and a long, maintenance-free operational life within the specified temperature range.
S71918 CD/HCP4ADT Bearing Typical Application Areas
The S71918 CD/HCP4ADT is specifically designed for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision lathes.
- High-Frequency Motors & Spindles: Motors for PCB drilling and other high-RPM applications.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
