S71904 CE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71904 CE/HCP4ADT Bearing Product Overview & Core Advantages
The S71904 CE/HCP4ADT is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. This duplex tandem (DT) matched set offers exceptional rotational accuracy and stability, capable of handling combined radial and axial loads. Its advanced construction, featuring a phenolic cage and ceramic balls, ensures superior performance in high-speed spindles and precision machinery, delivering unmatched reliability and long service life.
Model Code Breakdown
| Suffix Code | Technical Meaning |
|---|---|
| S | Super-precision bearing |
| 71904 | Bearing series and size designation (20mm bore, 37mm OD, 18mm width) |
| CE | Contact angle of 15° |
| HC | Hybrid ceramic balls |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| DT | Duplex Tandem arrangement (two bearings matched for increased axial load capacity in one direction) |
S71904 CE/HCP4ADT Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of ceramic balls (silicon nitride) and a phenolic resin cage significantly reduces centrifugal forces and friction, enabling exceptional limiting speeds up to 75,000 rpm. This makes it ideal for high-frequency spindle applications.
Enhanced Rigidity & Load Capacity: The duplex tandem arrangement provides increased axial load capacity in one direction, while the 15° contact angle optimizes the bearing for combined loads. The P4A precision tolerance ensures minimal runout and vibration.
Thermal Stability & Longevity: Ceramic balls have a lower coefficient of thermal expansion than steel and are electrically insulating, reducing heat generation and the risk of electrical erosion. The pre-greased design with high-performance lubricant ensures consistent operation within the specified temperature range of -30°C to 110°C.
S71904 CE/HCP4ADT Bearing Typical Application Areas
- High-Frequency Machine Tool Spindles
- Precision Grinding Machines
- High-Speed CNC Machining Centers
- Dental and Medical Equipment Spindles
- Semiconductor Manufacturing Equipment
- Aerospace Instrumentation
