Stainless steel is an excellent choice for hydraulic adapters and hose ends. Stainless steel is incredibly strong and corrosion resistant. It is an alloy of steel that contains more than 10.5% chromium. The chromium in stainless steel provides increased resistance to oxidation, and the resistance increases as the ratio of chromium to steel increases. The corrosion resistance in stainless steel hydraulic fittings is due to the formation of a self-repairing layer of chromium oxide on the surface of the stainless steel. Because stainless steel is corrosion resistant, stainless steel fittings are an ideal choice for applications where the hydraulic fluid or the environment is corrosive. Stainless steel is also much tougher than carbon steel at lower temperatures.