Abstract: A hub that has universal application for use with a rotatable body, such as a packer wheel for seed planting, includes a flange which abuts a side wall of the body, a non-circular or polygonal boss that projects laterally from an inner side of the flange, and a bore that extends through the hub along the rotation axis. The non-circular shape of the boss prevents relative rotation between the hub and the body. The bore is generally cylindrical to receive a cylindrical shaft but it is also provided with generally V-shaped corners cut into the bore surface so that the bore can receive a rectangular shaft to which the hub is thereby locked for rotation therewith. The end face of the boss is provided with a projecting pin diametrically opposed from a similarly shaped recess such that the pin and recess of one hub can mate with the recess and hub respectively of another hub to achieve an aligned hub assembly for mounting a wide rotating body.