420J2 stainless steel bar is a martensitic stainless steel with good wear and corrosion resistance, high hardness, and excellent machinability. It is one of the most affordable stainless steel bar types and is suitable for various precision machinery, bearings, electrical equipment, instruments, meters, transportation vehicles, and household appliances. It is often used to manufacture components that are resistant to corrosion from the atmosphere, steam, water, and oxidizing acids.