ARP Custom Age 625+: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. This is the material of choice in the high strength, super-alloy field. Typical tensile strength is 260,000-280,000 psi. (Compared to max 260,000 for L19 and 220,000 for ARP2000).