S7021 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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S7021 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S7021 ACD/P4AQBCA is a precision quadruplex matched bearing set designed for demanding applications requiring exceptional rigidity and rotational accuracy. This metric angular contact ball bearing features a back-to-back (QBC) arrangement of four preloaded bearings, enabling it to handle combined radial and axial loads simultaneously with superior stability. Manufactured to P4A tolerance class with an extra light preload (Class A), it delivers high-speed performance and is ideal for high-precision, high-reliability machinery where minimal deflection is critical.
S7021 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
- S7021: Basic bearing series, indicating a 105 mm bore, 160 mm OD, and specific internal design.
- ACD: Angular Contact design with a 25° contact angle for optimal axial load capacity.
- P4A: High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy for bore, outside diameter, and width.
- QBC: Quadruplex Back-to-Back matched set arrangement. This configuration provides maximum rigidity and moment load capacity.
- Sealed: The bearing is sealed to retain lubrication and exclude contaminants, ensuring long service life.
- Grease Lubrication: Pre-lubricated with grease suitable for a temperature range of -30°C to 110°C.
S7021 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Stability: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, which is crucial for maintaining precision in machine tool spindles and other high-performance equipment.
High Load Capacity: With a dynamic load rating of 54,450 lbf and a static load rating of 82,125 lbf, this bearing set is engineered to withstand significant combined radial and axial loads.
Optimized High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at high speeds, with a limiting speed of 10,000 rpm. The 25° contact angle provides an excellent balance between radial and axial load capacity for high-speed applications.
Precision and Longevity: Manufactured from chrome steel for both rings and balls, and built to P4A precision tolerances, this bearing ensures consistent, reliable performance and extended service life in precision machinery.
S7021 ACD/P4AQBCA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme rigidity and accuracy.
- Precision Grinding Equipment: Applications where minimal runout and high rotational stability are paramount.
- High-Frequency Machining Spindles: For CNC machining centers operating at very high RPM.
- Industrial Pumps and Compressors: Precision rotary equipment that demands reliable performance under combined loads.
