S71921 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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S71921 CD/HCP4A Bearing Product Overview & Core Advantages
The S71921 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. As a single-row bearing with a 15° contact angle, it is optimized to handle combined loads, accommodating high radial loads and substantial thrust loads in one direction. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, while the ceramic ball and phenolic cage construction contribute to high-speed capability and reduced weight. This bearing is preloaded and pre-lubricated, making it an ideal, ready-to-install solution for high-rigidity, high-RPM systems.
Model Code Breakdown
- S71921: Basic model number denoting a 105 mm bore, 145 mm OD, and 20 mm width.
- C: Indicates a 15° contact angle.
- D: Signifies a high-precision, duplex design (implying preload and matching).
- HC: Denotes a hybrid ceramic construction (steel rings with ceramic balls).
- P4A: Specifies the P4 tolerance class (equivalent to ABEC-7) with specific internal clearance and geometry requirements.
S71921 CD/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: Manufactured to P4 tolerance class, this bearing provides extremely precise shaft guidance and minimal runout, which is critical for applications like machine tool spindles. The preload eliminates internal clearance, resulting in a stiffer system that resists deflection under load.
Enhanced Speed and Temperature Performance: The use of ceramic balls (Si3N4) reduces centrifugal forces and friction, allowing for a higher limiting speed of 10,000 rpm. The phenolic resin cage is lightweight and possesses excellent slip characteristics, further supporting high-speed operation. This hybrid construction also allows for stable performance across a wide temperature range from -30°C to 110°C.
Superior Load Capacity: With a dynamic load rating of 13,905 lbf and a static load rating of 15,638 lbf, the bearing is designed to handle significant combined radial and axial loads.
Maintenance-Free Operation: The bearing is sealed and pre-lubricated, protecting against contamination and providing long-term, maintenance-free service life.
S71921 CD/HCP4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for applications where high speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace and Defense Systems
- Robotic Drives and Servo Motors
