Abstract: A heavy duty, knock-down industrial cart for holding and transporting relatively heavy objects is formed of a generally rectangular base frame having rigid, interconnected elongated side and end strips upon which wood boards are rested to form a support floor. The boards span between opposing side strips and the ends of the boards are clamped upon the side strips by metal angle strips each having a horizontal leg overlying the board ends and a vertical leg fastened to their respective side strips. Vertical posts are secured to the base frame strips and support wheels are secured to the bottom of the frame. The frame strips, posts and boards are fastened together by releasable mechanical fasteners so that the parts forming the cart may be manually assembled and disassembled and one or more damaged boards can be removed and replaced with new boards when discarded.