Nuclear

Nuclear Fasteners & Reactor Bolts

Nuclear-grade fasteners engineered for reactor internals, steam generators, and critical service hardware. Decades of thermal stability, irradiation resistance, and complete material traceability.

Which alloys carry reactor and steam generator duty?

Nuclear fasteners operate under conditions where failure is not an option: reactor internals experience neutron irradiation, high-temperature water chemistry, and decades of continuous service. Inconel 718 provides high strength for reactor internals and control rod drive mechanisms with full lot traceability. Nimonic 80A offers long-term thermal stability for steam generator internals where decades of creep life matter more than peak strength. Inconel 625 resists primary water stress corrosion cracking in core components. Hastelloy C-276 handles waste treatment and reprocessing environments with mixed corrosive streams.

Inconel 718 nuclear bolts
Nickel-Based Superalloy

Inconel 718 Bolts

UNS N07718 · GH4169

Max Temp
700°C
Tensile
1275 MPa

Jet Engines · Gas Turbines · Nuclear · Subsea

Nimonic 80A nuclear bolts
Nickel-Based Superalloy

Nimonic 80A Bolts

UNS N07080 · GH4080A

Max Temp
815°C
Tensile
1100 MPa

Turbine Blades · Exhaust Valves · Steam Generators · Industrial Furnaces

Inconel 625 nuclear bolts
Nickel-Chromium-Molybdenum Alloy

Inconel 625 Bolts

UNS N06625 · GH3625

Max Temp
650°C
Tensile
930 MPa

Marine · Chemical Processing · Nuclear · Aerospace Ducting

Hastelloy C-276 nuclear bolts
Nickel-Molybdenum-Chromium Alloy

Hastelloy C-276 Bolts

UNS N10276 · Alloy C-276

Max Temp
425°C
Tensile
790 MPa

Chemical Processing · FGD Scrubbers · Pulp & Paper · Waste Treatment

Where does each grade serve?

Reactor Bolts

Reactor internals fasteners, core support bolting, and control rod drive mechanism hardware in Inconel 718. Full heat-lot traceability with EN 10204 3.1 or 3.2 certification.

Steam Generator Internals

Steam generator bolting and tube support fasteners in Nimonic 80A for long-term thermal stability. Resists primary and secondary water chemistry at 300-350°C for decades.

Waste & Reprocessing

Reprocessing plant and waste treatment fasteners in Hastelloy C-276. Resists nitric-hydrofluoric acid mixtures, hot chloride media, and mixed fission product environments.

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