S71905 ACDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
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S71905 ACDTP/HCP4B Bearing Product Overview & Core Advantages
The S71905 ACDTP/HCP4B is a high-precision, single-row angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered to support combined loads (simultaneous radial and axial loads), this bearing features a 25° contact angle for optimal axial load capacity. Its compact design, with a 9 mm width, makes it ideal for space-constrained, high-speed spindles and precision instruments. The combination of a phenolic cage, ceramic balls, and a P4 (ABEC-7) tolerance class ensures smooth operation, low heat generation, and superior high-speed capability, achieving a limiting speed of 40,000 rpm.
S71905 ACDTP/HCP4B Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series with specific internal design for optimal performance.
- 1905: Standard size designation (Bore: 25 mm, Outside Diameter: 42 mm, Width: 9 mm).
- AC: Angular Contact design with a defined contact angle (25°).
- DTP: Combination code indicating a phenolic (resin) cage and 15-degree contact angle pairing (Note: Specification lists 25°, consult manufacturer for exact DTP definition regarding preload or pairing).
- HC: Hybrid Ceramic construction, featuring ceramic balls and steel rings.
- P4: P4 Tolerance Class (equivalent to ABEC-7), denoting very high precision levels for bore, outside diameter, and width.
- B: Indicates a preload is applied to the bearing for increased rigidity and precise rotational accuracy.
S71905 ACDTP/HCP4B Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The single-row angular contact design, combined with a P4 precision class and applied preload, provides exceptional system stiffness and minimal runout, which is critical for high-precision machining and instrumentation.
Superior High-Speed Performance: The hybrid ceramic construction (ceramic balls with steel rings) significantly reduces centrifugal forces and friction, while the lightweight phenolic cage ensures stability and low heat generation at the limiting speed of 40,000 rpm.
Enhanced Load Capacity: The 25° contact angle is optimized to handle significant combined loads, offering a robust radial dynamic load rating of 1433 lbf and a radial static load rating of 855 lbf.
Sealed and Lubricated for Long Life: As a sealed bearing, it is protected from contaminants and comes pre-lubricated, ensuring reliable operation and reduced maintenance within its specified temperature range of -30° to 110 °C.
S71905 ACDTP/HCP4B Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- High-Frequency CNC Spindles
- Precision Grinding Machine Spindles
- High-Speed Robotics and Automation
- Medical and Dental Drill Handpieces
- Aerospace Instrumentation and Gyroscopes
