S71920 ACD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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S71920 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The S71920 ACD/P4AQBCC is a high-precision quadruplex matched set of angular contact ball bearings designed for the most demanding applications. This P4A tolerance class metric bearing set is engineered to provide exceptional system rigidity and handle significant combined loads (radial and axial) in both directions. Its back-to-back quadruplex arrangement (QBC) and moderate preload (Class C) ensure optimal performance in high-speed, high-accuracy environments, making it a superior choice for applications requiring maximum stability and precision.
S71920 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Basic bearing designation (19 Series, 100mm bore, 140mm OD, 80mm width) |
| ACD | Contact angle of 25° |
| P4A | High precision tolerance class (exceeding ABEC 7/ISO P4) |
| QBCC | Quadruplex Back-to-Back (QBC) matched set with moderate preload (Class C) |
S71920 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads from multiple directions. This configuration provides superior moment load resistance compared to single bearings or duplex sets.
High-Speed Performance: The phenolic cage material offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling stable operation at the specified limiting speed of 16,250 rpm.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for precision applications.
Optimized Contact Design: The 25° contact angle provides an optimal balance between radial and axial load capacity, making it suitable for applications requiring substantial thrust load support.
Sealed & Lubricated: The sealed design with factory-applied grease lubrication protects against contamination and provides maintenance-free operation within the specified temperature range of -30°C to 110°C.
S71920 ACD/P4AQBCC Bearing Typical Application Areas
This high-precision quadruplex bearing set is specifically designed for applications requiring maximum rigidity, accuracy, and speed capability:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial robotics and automation systems
- Aerospace Systems: Jet engine components and flight control mechanisms
- Medical Equipment: High-speed dental handpieces and surgical tools
- Test & Measurement: Precision rotary tables and coordinate measuring machines
