An improved rack frame cabinet for supporting electronic components having a plurality of elongate frame members and a plurality of corner brackets arranged to engage at least three adjacent frame members at each corner of said cabinet. Each of the elongate frame members includes a tube portion defined by walls forming a cavity therein, a first flange member, and a second flange member. The tube portion and both of the flange members extend along the length of the elongate frame member. The first flange member is aligned with one of the walls of the tube portion of each elongate frame member. The second flange member is parallel to and offset from another wall of the tube portion of each elongate frame member. The first and second flange members are substantially perpendicular to one another. One end of each frame member is positioned at one corner of the rack frame cabinet so that a portion of the first flange member of one frame member overlaps and connects to a portion of the second flange member of one of the two adjacent frame members and a portion of the second flange member of one frame member overlaps and connects to a portion of the first flange member of the other of the two adjacent frame members.