Abstract: A quickly assembled and disassembled mounting bracket assembly for cylindrical objects, such as pressurized gas (e.g., oxygen) tanks, is described. The bracket assembly has two interconnecting parts: a bracket section and a base plate. The bracket section is slidable within the base plate, similar to a rail system. The two interconnecting pieces slidably interlock via spaced-apart T-shaped connectors disposed on distal side portions thereof. Assembly movement is minimal so that the two pieces can be joined quickly. Limiting stops provide mating alignment. Once in the aligned position, one or more locking detent pins are inserted through alignment holes disposed in the mating sections to secure the two parts in place.