Abstract: A storage rack assembly system is made up of a plurality of vertical members and a plurality of cross-members supported by the vertical members. The vertical members can be stacked one on top of another and locked together by means of suitable connectors, which connectors are also used to support the cross-members. In a first embodiment of the invention, the connectors are rods on the ends of the cross-members engaging aligned holes extending laterally through connecting portions of the vertical members. In another embodiment, the vertical members are vertically locked to each other by suitable bolts, the bolts providing stepped portions for engaging recesses in shelves extending between the vertical members. The connectors further enable the system to be expanded horizontally as well as vertically.