What is the material equivalent to SAE J404 - 5120?

The material equivalent to SAE J404 - 5120 is generally recognized as AISI 5120 steel. This is a low alloy steel typically containing around 0.20% carbon and around 0.5% chromium, which enhances its strength and hardenability. It is commonly used in applications such as gears, axles, and other components requiring good wear resistance and toughness.