They're both nickel alloys with a lot in common. AL6XN and Alloy 20 are similar in that they both retain their strength up to 1000°F. Furthermore, they both perform well in saltwater environments, with excellent resistance to crevice and pitting corrosion, as well as stress corrosion cracking.

AL6XN fasteners have a yield strength that is approximately 50% higher than Alloy N08020 Fasteners due to their higher iron and molybdenum content. Alloy 20 was developed to withstand the corrosive environment of hot sulfuric acid. In these conditions, alloy 20 fasteners outperform AL6XN fasteners. These fasteners have good stress-corrosion cracking resistance in boiling sulfuric acid at specific concentrations ranging from 20% to 40%, as well as general sulfuric acid resistance.