KD Fasteners’ line of Inconel heavy hex bolts is the perfect solution for a wide range of temperature problems. From extreme lows to extreme highs, custom Inconel heavy hex bolts excel.

Our Inconel heavy hex bolts are known for their ability to withstand extremely corrosive elements and atmospheres. These include seawater, neutral salts, alkaline media, oxidizing chemicals and nonoxidizing environments. Made with a larger head than our standard hex bolt, custom Inconel heavy hex bolts are manufactured for your large construction needs. We will work with you to find the right bolt for your project.

KD Fasteners’ Inconel heavy hex bolts are the preferred bolt for chemical processing, aerospace, marine, electronics, propulsion motors, submarine, and oil and gas industries.

Inconel Heavy Hex Bolts Options & Specifications

Available in Inconel 600, 625, 718 and 725
Available in standard (inch) and metric sizing
Custom sized diameter up to 3 ½ inches
Imported and domestic brands available

We offer custom Inconel Heavy Hex Bolts with a quick turnaround time. 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.

Physical Properties

Grade	Tensile Strength (KSI)	Yield Strength at 0.2% Offset (KSI)	Elongation in 4D
600	80.0	35.0	30%
718	155	95	30%

*718 is solution heat treated

Chemical Properties

Nickel Inconel 600
Element	Percent
Nickel (plus cobalt) min	72
Chromium	14-17
Iron	6-10
Carbon (Max)	.15
Manganese (Max)	1
Sulfur (Max)	.015
Silicon (Max)	.5
Copper (Max)	.5

Nickel Inconel 625
Element	min	max
Nickel	58	—
Chromium	20	23
Iron	—	5
Molybdenum	8	10
Niobium (plus Tantalum)	3.15	4.15
Carbon	—	.1
Manganese	—	.5
Silicon	—	.5
Phosphorus	—	.015
Sulfur	—	.015
Aluminum	—	.4
Titanium	—	.4
Cobalt*	—	1

Nickel Inconel 718
Element	min	max
Carbon	—	0.08
Manganese	—	0.35
Silicon	—	0.35
Phosphorus	—	0.015
Sulfur	—	0.015
Chromium	17.00	21.00
Nickel	50.00	55.00
Molybdenum	2.80	3.30
Columbium (Niobium)	4.75	5.50
Titanium	0.65	1.15
Aluminum	0.20	0.80
Cobalt	—	1.00
Tantalum	—	0.05
Boron	—	0.006
Copper	—	0.30
Iron	remainder	—

Inconel 625 Heavy Hex Bolts

Our Inconel 625 heavy hex bolts offer excellent strength and toughness in the temperature range of cryogenic to 2000°F.

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Inconel 718 Heavy Hex Bolts

Inconel 718 heavy hex bolts are ideal for extreme environments that require oxidation and corrosion resistant bolts.

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Inconel 725 Heavy Hex Bolts

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.

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Inconel 600 Heavy Hex Bolts

Inconel 600 is a nickel-chromium alloy with good oxidation resistance at higher temperatures. This material also has good resistance in carburizing and chloride containing environments.

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