S71920 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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S71920 CB/HCP4A Bearing Product Overview & Core Advantages
The S71920 CB/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle, enabling it to support combined loads—significant radial loads and simultaneous axial loads in one direction. Its P4 (ABEC-7) tolerance class ensures ultra-precision operation, while the ceramic balls and phenolic cage contribute to superior high-speed performance, reduced weight, and extended service life. Preloaded and lubricated from the factory, it offers immediate, reliable performance in high-rigidity, high-speed spindle configurations.
S71920 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Basic bearing designation, indicating a 100mm bore, 140mm OD, 20mm width angular contact ball bearing. |
| C | Specifies a 15° contact angle. |
| B | Indicates the bearing is supplied with a preload for high rigidity. |
| HC | Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | Denotes an ABEC-7 / ISO P4 super-precision tolerance class. |
S71920 CB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds compared to all-steel bearings. This also provides inherent electrical insulation and superior resistance to wear.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability at high speeds and operates effectively under high centrifugal forces, contributing to the bearing's high-speed capability of 15,000 rpm.
Precision & Rigidity: Manufactured to P4 tolerance and supplied with a preload, this bearing delivers minimal runout and high system rigidity, which is critical for maintaining accuracy under load.
High Load Capacity: With a dynamic load rating of 4860 lbf and a static load rating of 5040 lbf, it is engineered to handle substantial combined radial and axial loads.
Sealed & Lubricated: The sealed design protects against contamination, and the factory-applied lubrication ensures immediate, maintenance-free operation within its specified temperature range.
S71920 CB/HCP4A Bearing Typical Application Areas
The S71920 CB/HCP4A is ideally suited for high-performance machinery requiring precision, speed, and rigidity. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors operating at very high RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instruments.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
