A slide rail assembly, applicable to a rack for a server cabinet, the slide rail assembly comprising: a rail element connected to a first bracket which is configured to be mounted to the rack of the server cabinet, said rail element having a first wall, a second wall and an extension wall connected between the first wall and the second wall; a main supporting element fixedly connected to a backside of the extension wall of the rail element, the main supporting element having a pair of supporting walls (74a, 74b) and a longitudinal wall connected between the pair of supporting walls (74a, 74b), a main passage being defined by the pair of supporting walls (74a, 74b) and the longitudinal wall; a first supporting element having at least one portion arranged in the main passage of the main supporting element, the first supporting element having a pair of first supporting walls (80a, 80b) and a first longitudinal wall connected between the pair of first supporting walls (80a, 80b), a supporting passage being defined by the pair of first supporting walls (80a, 80b) and the first longitudinal wall; a second supporting element having at least one portion arranged in the supporting passage of the first supporting element, the second supporting element having a pair of second supporting walls (86a, 86b) and a second longitudinal wall connected between the pair of second supporting walls (86a, 86b); characterized by: a supporting base fixedly connected to the first supporting element, the supporting base comprising at least one supporting feature (90a, 90b) directly holding one of the first wall and the second wall of the rail element, the supporting base configured to move with the first supporting element to support the rail element; and a second bracket mounted to the second supporting element, and configured to be mounted to the rack for the server cabinet. a rail element connected to a first bracket which is configured to be mounted to the rack of the server cabinet, said rail element having a first wall, a second wall and an extension wall connected between the first wall and the second wall; a main supporting element fixedly connected to a backside of the extension wall of the rail element, the main supporting element having a pair of supporting walls (74a, 74b) and a longitudinal wall connected between the pair of supporting walls (74a, 74b), a main passage being defined by the pair of supporting walls (74a, 74b) and the longitudinal wall; a first supporting element having at least one portion arranged in the main passage of the main supporting element, the first supporting element having a pair of first supporting walls (80a, 80b) and a first longitudinal wall connected between the pair of first supporting walls (80a, 80b), a supporting passage being defined by the pair of first supporting walls (80a, 80b) and the first longitudinal wall; a second supporting element having at least one portion arranged in the supporting passage of the first supporting element, the second supporting element having a pair of second supporting walls (86a, 86b) and a second longitudinal wall connected between the pair of second supporting walls (86a, 86b); characterized by: a supporting base fixedly connected to the first supporting element, the supporting base comprising at least one supporting feature (90a, 90b) directly holding one of the first wall and the second wall of the rail element, the supporting base configured to move with the first supporting element to support the rail element; and a second bracket mounted to the second supporting element, and configured to be mounted to the rack for the server cabinet. a supporting base fixedly connected to the first supporting element, the supporting base comprising at least one supporting feature (90a, 90b) directly holding one of the first wall and the second wall of the rail element, the supporting base configured to move with the first supporting element to support the rail element; and a second bracket mounted to the second supporting element, and configured to be mounted to the rack for the server cabinet.