A stud 2 for a horseshoe 4 comprises a threaded portion 6 of a length suitable for screwing into and out of a threaded hole 8 in the horseshoe 4 while the horseshoe 4 is on a hoof 18 of the horse, and a head portion 10 which in use extends out of the stud 2 and engages a surface over which a horse fitted with the horseshoe 4 moves. The threaded portion 6 has a coarse thread 12 with flat tips 14 and flat roots 16, such as a trapezoidal thread, to help prevent cross-threading and damage to the thread in use. The end of the threaded portion, distal from the head, may be flat.
