Abstract: A unitary bolt for repairing cracked or broken flanges to which the base of a toilet is mounted is characterized by its structure comprising a threaded bolt that extends upwardly from, and is fixedly attached to, an arcuate plate. The repair bolt may be inserted under the damaged flange by sliding the plate under the damaged or cracked flange such that the plate will span the damaged portion and the threaded bolt may fit into a notch provided or formed on the flange such that removal and replacement of the flange is not necessary for proper re-seating of the toilet.