S71928 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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S71928 CD/HCP4A Bearing Product Overview & Core Advantages
The S71928 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This sealed, single-row bearing is distinguished by its P4 (ABEC-7) tolerance class, ceramic ball construction, and availability with preload. It is designed to handle high-speed operation and significant combined loads (radial and axial), making it an ideal solution for high-rigidity, high-reliability spindle systems and precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S | Indicates a bearing with a 15° contact angle. |
| 7 | Denotes an angular contact ball bearing. |
| 1928 | Specifies the bearing dimensions: 140mm bore, 190mm OD, 24mm width. |
| CD | Signifies a high preload level for maximum system rigidity. |
| HC | Indicates the use of hybrid ceramic balls (Silicon Nitride). |
| P4 | Specifies the P4 (ABEC-7) tolerance class for ultra-precision operation. |
| A | Indicates the bearing is sealed on one side. |
S71928 CD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of ceramic balls with a steel ring significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions. This construction also provides superior resistance to electrical arcing.
High Rigidity & Preload: The CD preload designation ensures the bearing is supplied with a high preload, resulting in exceptional system stiffness, precise rotational accuracy, and minimal deflection under load.
Optimized High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction and higher limiting speeds. Combined with the hybrid design, this allows for reliable operation at up to 8,000 rpm.
Precision & Load Capacity: Manufactured to P4 tolerance, this bearing guarantees smooth, quiet, and accurate rotation. It offers a high dynamic load rating of 21,510 lbf and a static load rating of 26,100 lbf, enabling it to handle significant combined loads.
Sealed & Lubricated: The integral seal protects against contamination and retains the factory-fill lubricant, ensuring long-term, maintenance-free operation within the specified temperature range.
S71928 CD/HCP4A Bearing Typical Application Areas
The S71928 CD/HCP4A is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed CNC machining centers, milling, and grinding spindles.
- Precision Robotics: High-accuracy robotic arm joints and direct-drive motors.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- High-Frequency Motors & Spindles: Electric vehicle traction motors, compressor spindles, and other high-RPM industrial drives.
