The Threads of Studs/Rounded Rods are Coarse Threads, Fine Threaded Rods, and Acme Threaded Rods depending upon the application. Some special grades are used for manufacturing Studs/Rounded Rods such as EN 10269 1.7218, 155680, 1.7725 are used for low temperature and grades 1.1181, 1.7218, 1.7255, 1.7709, 1.4923 are used for high temperature.