S71908 CDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
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S71908 CDTP/HCP4B Bearing Product Overview & Core Advantages
The S71908 CDTP/HCP4B is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing, it is optimized to support combined loads—simultaneously handling significant radial loads and axial loads in one direction. Its defining features include a P4 (ABEC-7) tolerance class for ultra-precise operation, a 15° contact angle for optimal axial load capacity, and a preload applied to ensure maximum system stiffness and minimal runout. The use of ceramic balls and a phenolic cage further enhances its performance, making it an ideal choice for high-speed and high-reliability spindle applications.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S | Stainless Steel (Note: Specification indicates Chrome Steel rings, but 'S' prefix often denotes corrosion-resistant considerations) |
| 71908 | Bearing series and size designation (40mm bore, 62mm OD, 12mm width) |
| C | 15° contact angle |
| D | High preload |
| T | Phenolic (textile) cage |
| P | Enhanced dimensional and running accuracy |
| HC | Hybrid Ceramic (Silicon Nitride balls) |
| P4 | P4 tolerance class (ABEC-7) |
| B | 72° contact angle (Note: This may conflict with 'C' designation; typically, 'B' indicates a 40° contact angle. The specification confirms a 15° angle, so 'C' is the primary identifier.) |
S71908 CDTP/HCP4B Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class and applied preload ensure minimal deflection and exceptional running accuracy, which is critical for maintaining precise tool paths and surface finishes in machining operations.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling a high limiting speed of 26,000 rpm. This makes the bearing exceptionally suited for high-speed spindle applications.
- Extended Service Life and Reliability: Hybrid ceramic construction offers superior resistance to wear and thermal expansion compared to all-steel designs. The ceramic balls also provide increased stiffness and operate effectively within a broad temperature range from -30°C to 110°C.
- Optimized Load Capacity: The 15° contact angle is engineered to efficiently support combined loads, providing a robust radial dynamic load rating of 2790 lbf and a radial static load rating of 1912 lbf.
S71908 CDTP/HCP4B Bearing Typical Application Areas
This precision angular contact ball bearing is engineered for high-performance applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed CNC milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high positional accuracy.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
- Aerospace & Defense: Gyroscopes, radar systems, and other instrumentation.
- High-Frequency Motors and Spindles: Where minimal vibration and heat generation are critical.
