Duplex Bolt

A duplex bolt is a threaded fastener made from super duplex stainless steel, known for high strength and corrosion resistance. It is used in aggressive environments.

A duplex bolt suits marine, chemical and other corrosive environments. It often takes a nut and washer of the same material and thread, and a spanner or socket sets it.

This bolt is often made in super duplex stainless steel grade 2507, UNS S32750 or S32760. This material offers high resistance to chloride stress corrosion and pitting. It suits high strength applications in seawater and acidic conditions.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance and a mill test certificate that shows the material grade. On receipt, check the bolt markings and surface for defects. Verify the dimensions and thread match the order.