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The SKF 6221-2Z double shielded deep groove ball bearing is engineered for larger rotating assemblies where a 105mm shaft requires substantial radial load capacity within a 190mm housing bore. Its single row deep groove raceways accommodate predominantly radial loads alongside axial forces acting in either direction, subject to the bearing's operating limits. SKF specifies a basic dynamic load rating of 140kN and a basic static load rating of 104kN, making these values important when calculating bearing life and assessing sustained or intermittent loading. The 36mm width also requires correctly positioned shaft shoulders and housing retainers. As an SKF Explorer bearing, this model offers a precision-manufactured solution for industrial equipment where dependable shaft guidance and controlled rotational performance are essential.
The 2Z designation identifies a metal shield on each side, rather than the contacting rubber seals used on 2RS1 variants. These non-contact shields help retain the factory grease and limit the entry of larger contaminants while producing less sealing friction. They are particularly suitable for enclosed machinery operating in relatively clean environments, but are not intended to provide the same protection against water and fine contamination as contact seals. SKF lists a reference speed of 7,000rpm and a limiting speed of 3,600rpm; these figures describe different operating criteria and must not be treated as interchangeable maximum speeds. The bearing has normal (CN) radial internal clearance and a pressed sheet metal cage. When replacing an existing bearing, verify the complete 6221-2Z designation, clearance and mounting arrangement.
Typical Applications:
Large industrial electric motors and drive assemblies
Heavy-duty conveyor and material handling equipment
Industrial pumps and rotating machinery
Mechanical transmission and power distribution systems
Large industrial fans and ventilation drive units
