A data center cabinet has an equipment rail movably secured to front-to-back beams by a retaining mechanism. The retaining mechanism has a threaded member extending through a front-to-back beam and the equipment rail and a handle rotatable relative to the threaded member. A first cam disk is positioned between the handle and equipment rail and is fixed to the equipment rail and a second cam disk is positioned between the handle and first cam disk and is fixed to the handle. First and second surfaces of the first and second cam disks are engaged with the handle in a first position to provide a clamping force between the equipment rail and front-to-back beam to prevent movement of the equipment rail and the first and second cam surfaces are disengaged with the handle in a second position to remove the clamping force to allow movement of the equipment rail.