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At Bearings Direct we are proud to offer a variety of 4 bolt flange bearing units. 4 bolt flange bearings are mounted within a flanged bearing housing and are preferred when the bearing mounting surface is perpendicular to shaft access. 4 bolt flanged ball bearing units have a square shape with four holes for mounting. The four hole design accommodates higher loads than a two or three bolt flange. For more information about 4 bolt flange bearing units, contact us today!