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40 Inch Four-Point Contact 1013x1278x79mm Ball Slewing Ring Bearing - Outside Gear Inner Diameter - 11/16 inch (0.6875") 7001C P5 High Precision Angular40 Inch Four Point Contact 1013x1278x79 mm Ball Slewing Ring Bearing with Outside Gear Four Point Contact Ball Slewing Bearing with Outside 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