S71920 CD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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S71920 CD/P4AQBCC Bearing Product Overview & Core Advantages
The S71920 CD/P4AQBCC is a precision angular contact ball bearing designed for the most demanding applications. This quadruplex matched set in a back-to-back (QBC) arrangement is engineered to provide exceptional system rigidity and stability. Operating under a moderate preload (Class C), it delivers superior running accuracy, making it ideal for high-speed spindles and other precision machinery. Its primary advantage lies in its ability to handle complex combined loads—significant radial and axial loads in both directions—simultaneously, ensuring reliable performance in high-precision, high-reliability scenarios.
S71920 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
The model number S71920 CD/P4AQBCC provides detailed technical specifications:
- S7: Denotes a high-precision bearing series with enhanced design features.
- 1920: Standard size designation (Bore: 100mm, Outside Diameter: 140mm, Width: 80mm).
- C: Indicates a 15° contact angle, optimized for high-speed operation and moderate axial load capacity.
- D: Signifies a duplex bearing (in this context, part of a larger matched set).
- P4A: Specifies an ultra-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration for exceptional rotational accuracy.
- QBCC: Defines the matched arrangement. "Q" indicates a Quadruplex set (4 bearings), and "BCC" details the specific preload and mounting configuration (Back-to-Back with Class C preload).
S71920 CD/P4AQBCC Bearing Structural Features & Performance Benefits
The design of the S71920 CD/P4AQBCC translates directly into superior performance:
- High Rigidity & Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is critical for maintaining precision in machine tool spindles.
- Superior Load Capacity: The angular contact design and duplex construction enable it to withstand substantial combined radial and axial loads from both directions.
- Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 16,250 rpm. The 15° contact angle is ideal for these high-speed applications.
- Precision & Longevity: Manufactured to P4A tolerance class with chrome steel rings and balls, this bearing guarantees high running accuracy and extended service life. The bearings are pre-lubricated with grease suitable for the specified temperature range.
S71920 CD/P4AQBCC Bearing Typical Application Areas
This high-precision bearing set is specifically engineered for advanced industrial equipment where accuracy, speed, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Advanced Medical Equipment (e.g., high-speed dental handpieces, imaging scanners)
- Aerospace Test & Measurement Equipment
