Inconel 625 hex bolts offer good corrosion resistance at elevated temperatures and high temperature stability up to 2200°F. KD Fasteners Inc.’s Inconel 625 hex bolts are made with a high strength material with excellent toughness at elevated temperatures.

Also known as Alloy 625, Inconel 625 hex bolts are known for their ability to retain their strength and resist heat – both in and out of corrosive environments. The presence of nickel and chromium make Inconel 625 hex bolts corrosion, oxidation and carburization resistant. The molybdenum delivers excellent fatigue strength and resistance to stress, pitting and crevice corrosion cracking even when exposed to chloride ions.

Inconel 625’s high strength capabilities are due to the addition of molybdenum and niobium on its nickel-chromium matrix. These hex bolts are also resistant to a wide range of corrosive environments of unusual severity including sulfuric acid, hydrochloric acid and phosphoric acid.

Inconel 625 Characteristicsinconel 625 hex bolts

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

Because of these excellent attributes, Inconel 625 hex bolts are used in a variety of corrosive environments. In sea water applications, Inconel 625 hex bolts remain free from pitting and crevice corrosion. This makes it ideal for marine, submarine and Navy applications. Additionally, Inconel 625 hex bolts can be used in a variety of extreme conditions from heat shields to marine applications.


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

KD Fasteners, Inc. offers Inconel 625 hex bolts in diameters ranging from ¼ inch to 2 ½ inch with custom sizes also available. All of our Inconel 625 hex bolts, also known as Hex Cap Screws, are made in the United States.

Whatever Inconel 625 hex bolt you’re looking for, if we don’t have it on our shelf, we can quickly manufacture if for you. Contact us today by calling 1-800-736-5014 or filling out our contact form.