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21 Inch Four-Point Contact 528x732x80mm Ball Slewing Ring Bearing - No Gear Ball Diameter - 5 inch (5") Bearing No: FH210-50mmG21 Inch Four Point Contact 528x732x80 mm Ball Slewing Ring Bearing with No Gear Four Point Contact Ball Slewing Bearing with no Gear A slewing bearing ring is a rotational rolling element bearing that typically supports a heavy but slow turning or slow oscillating load, often a horizontal platform such as a conventional crane, or the wind facing platform of a horizontal axis windmill. (To 'slew' means to turn without change of place.) Item Outside