Our Inconel 625 hex nuts pair perfectly with our Inconel 625 bolts. Their corrosion resistance and high-temperature resistance with ultimate tensile strength make them the perfect fastener for any of your extreme applications.

KD Fasteners, Inc.’s Inconel 625 hex nuts offer excellent strength and toughness in the temperature range of cryogenic to 2000°F. Inconel 625 is a nickel-based alloy, but its high strength capabilities are due to the addition of molybdenum and niobium on its nickel-chromium matrix.

Inconel 625 is also, therefore, resistant to a wide range of corrosive environments of unusual severity. From remaining free from pitting and crevice corrosion in saltwater applications to withstanding a wide range of environments including sulfuric acid, hydrochloric acid, and phosphoric acid, Inconel 625 hex nuts are the nut of choice in extreme applications.

Inconel 625 Characteristicsinconel 625 hex nuts

  • Non-magnetic
  • Corrosion resistant
  • Oxidation resistant
  • Carburization resistant
  • Nickel-based alloy
  • Cryogenic to 2000°F temperature range
  • High corrosion-fatigue strength
  • High tensile strength


  • Aerospace industry
  • Chemical processing
  • Nuclear industry
  • Heat shields
  • Furnaces
  • Sea water applications
  • Marine
  • Submarine
  • Navy
  • Nuclear power plants: core and control rod bolts
  • Gas turbine engines
  • Pollution control equipment
  • Flare stacks

Inconel 625 hex nuts are available in standard (inch) and metric sizing. Available sizes start at ¼ inch and go to 3 inches in diameter. Products are made in the USA. Our hex nut styles include:

  • Finished hex
  • Machine screw nut
  • Heavy hex nut
  • Nylon insert lock nuts
  • Top lock nuts

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.