Q: I’m looking for a bolt that can handle salt air and be structurally sound with a tensile strength of about 115-120 ksi max – do I require a titanium grade 5 bolt because I know they are costly?

A: Probably not at that tensile strength. A Super Duplex bolt may be a good solution at an economic price point. Super Duplex 2507 bolts provide good corrosion resistance to salt water environments. They are also strong offering 125ksi UTS and 82ksi yield.

Q: How does a Duplex bolt compare to AL6XN in a hot saltwater situation?

A: Duplex bolts are ideal for chlorides and mild saltwater application such as brackish water, salt air and moderate temperature unpolluted seawater. An AL6XN bolt will provide more corrosion protection than a Duplex bolt in marine and salt water environments. They can also be used at higher temperatures 1000F compared to 570F of Duplex. Though for strength in seawater Super Duplex bolts offer 125ksi tensile strength compared to 108ksi of AL6XN.