A furniture system, method of assembling furniture for a work space, and a fastening apparatus for interconnecting furniture components include one or more fastening devices. Each fastening device includes a body that has a channel sized and configured to receive a first rail. Each fastening device also includes at least one of a connector assembly and an opening formed in the body for attaching the fastening device to at least one other furniture component. The connector assembly and the opening in the body are sized and configured so that the other furniture components are positioned such that at least one of their height and length extend in a direction substantially perpendicular to the length of the first rail, such as a direction that is mostly perpendicular to the length of the first rail. Other embodiments of the fastening device may include variations in configurations to the connector assembly or body.