Abstract: A mounting system for stacker cranes designed for handling materials in warehouse storage racks which system includes a depending cylindrical crane supporting post member carried by a suitable overhead track and carriage support structure for permitting the supporting post member to be moved transversely and longitudinally with respect to the warehouse storage racks. The mounting system on the supporting post member includes a radial/thrust bearing mounted on the post which provides vertical and lateral support for the load, and roller means spaced axially along the post from the bearing to engage the outer cylindrical surface of the post to provide lateral support for the crane mounted on the post while permitting the crane to be rotated through an arc of 360.degree. about the axis of the post, the system also including an electrical connection between the post and the crane to permit power to be provided to an electric power source mounted on the crane.