The material degree for brake drums is gray iron class 35 (HT250, FC250, GG25, ISO300, G250) with 1% copper (Cu). Their Brinell Hardness should be HB 180-250. Their weights are usually from 10kg to 45kg. They are widely used for the many kinds of vehicles such as cars, trucks, tractors etc. What is brake drum? Brake drum is shaped like a tambourine in the cast iron pieces, with the tire fixed and the same…