Featuring one of the strongest alloys, Inconel 725 heavy hex bolts are high strength fasteners just right for all of your marine applications.

KD Fasteners, Inc.’s Inconel 725 heavy hex bolts are made with a nickel-chromium-molybdenum-niobium age-hardenable alloy that has essentially the same corrosion resistance as Inconel 625. However, this alloy offers twice the strength of Inconel 625. The strength of Inconel 725 is developed by heat treatment to achieve high ductility and toughness. As a result, Inconel 725 is resistant to hydrogen embrittlement and stress-corrosion cracking.

 Inconel heavy Hex Bolt Inconel 725 Characteristics

  • Resistant to stress-corrosion cracking
  • Resistant to sea water
  • Excellent fracture toughness


  • Aircraft
  • High-strength marine applications
  • Sour gas service
  • Chemical processing
  • Aerospace
  • Oil and gas industries

Inconel 725 Heavy Hex Bolts are custom made with quick turnaround times. Available in standard (inch) and metric sizing. Standard sizes are available up to 4-inch diameter and custom sized diameter is up to 3 ½ inches. Products are made in the USA. Whether you need a standard or custom size, KD Fasteners has a solution for you. Contact us today by calling 1-800-736-5014 or filling out our contact form.