The barrel of an oil press machine is a crucial component that plays a significant role in the extraction of oil from various seeds or nuts. It is designed to contain and compress the raw materials to extract oil efficiently. The barrel is cylindrical in shape and is made of high-quality materials such as stainless steel to withstand the pressure and heat generated during the oil extraction process. The screw responsible for the extraction of oil by applying pressure on the raw materials is housed inside the barrel.