71908 CB/HCP4A
Hybrid Ceramic Super Precision Bearings
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71908 CB/HCP4A Bearing Product Overview & Core Advantages
The 71908 CB/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and speed capability. Designed to accommodate combined loads (radial and axial in one direction), this bearing features a 15° contact angle for optimal thrust capacity. Its P4 (ABEC-7) tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and precision machinery where minimal runout and vibration are critical. The combination of a phenolic cage and ceramic balls contributes to its outstanding high-speed performance.
71908 CB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 12mm width) |
| CB | Specific internal design and clearance for matched arrangement capability |
| HC | Hybrid Ceramic - indicates ceramic balls with steel rings |
| P4 | Precision class P4 (ABEC-7) - high precision tolerance |
| A | 30° contact angle variant (note: this bearing has 15° contact angle) |
71908 CB/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls provides superior performance characteristics including reduced friction, higher stiffness, and extended service life under demanding conditions.
High-Speed Capability: The phenolic resin cage offers excellent dimensional stability and low mass, contributing to the bearing's impressive limiting speed of 56,000 rpm. The lightweight construction minimizes centrifugal forces at high rotational speeds.
Precision Engineering: Manufactured to P4 tolerance class, this bearing ensures minimal runout and vibration, making it suitable for applications requiring extreme rotational accuracy and smooth operation.
Thermal Performance: Ceramic balls exhibit lower thermal expansion compared to steel, maintaining stable preload and performance across the operating temperature range of -30°C to 110°C.
71908 CB/HCP4A Bearing Typical Application Areas
- High-speed machine tool spindles for milling, grinding, and drilling operations
- Precision medical equipment including dental handpieces and surgical tools
- Aerospace components requiring high reliability and temperature resistance
- High-frequency spindles in PCB drilling and routing machines
- Laboratory and analytical equipment where precision and cleanliness are essential
- Robotic joints and actuators demanding high stiffness and accuracy
