Incoloy 800HT Bolts
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Sunmach is a trusted manufacturer and global supplier of Incoloy® 800HT (UNS N08811) bolts, offering production-ready fastening solutions for extreme high-temperature and corrosive industrial environments. With over 13 years of Manufacturing Experience and ISO 9001:2015 certification, we produce Hex Head Bolts, Heavy Hex Bolts, U Bolts, Plugs & Bushings, and custom Incoloy bolts for power generation, petrochemical, aerospace, oil & gas, chemical processing, marine, and furnace applications. Our Incoloy 800HT fasteners are designed to deliver exceptional creep resistance, oxidation resistance up to 900°C, and long-term reliability in demanding thermal-cycling conditions. Backed by in-house manufacturing, advanced heat treatment, and precision machining, we supply Europe, the USA, Japan, GCC countries, and Southeast Asia with premium-quality Incoloy fastening solutions. Our advanced manufacturing facility is equipped with precision cold-forming, thread rolling, and Incoloy-specific solution annealing (1100–1150°C) to ensure superior mechanical performance and dimensional accuracy. Every Incoloy 800HT bolt undergoes comprehensive quality testing, including chemical composition verification, tensile and high-temperature tensile testing, creep rupture testing, oxidation resistance testing, hardness verification, and 100% dimensional inspection. Manufactured from certified raw materials sourced from globally recognized mills, each bolt is supplied with full material traceability and a Certificate of Conformance (CoC). Whether for Standard or custom fastening requirements, Sunmach delivers high-performance Incoloy 800HT bolts engineered for long service life, exceptional oxidation resistance, and dependable performance in critical industrial applications.
Incoloy® 800HT (N08811) Bolts
Sunmach is an ISO 9001:2015 certified manufacturer and global supplier of standard Incoloy® 800HT Bolts, Heavy Hex Bolts, Plugs & Bushings, U Bolts & custom or Special Incoloy® 800HT Bolts. Apart from Incoloy® 800HT, We also manufacture bolts from these other special materials such as Duplex 2507, Hastelloy® G-30, Stainless Steel 300 Series, Nickel 200, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7 & Monel® 400, Monel® K-500, Special Stainless 904L, Nitronic® 60, 254 SMO, A4-80 Stainless Steel to name few.
To manufacture & timely deliver a precision Standard Incoloy® 800HT Bolts or Custom Incoloy® 800HT bolts, apart from adequate inventory, we have advanced machinery, experienced engineering team, R&D; team, Prototyping team, Heat Treatment facility & all required Testing along with the efficient logistic team. All Raw Materials sourced from the most reputable and renowned manufacturers in the world.
Sunmach bolts meet applicable DIN, ISO, ANSI and IS.
Sunmach serves a diverse range of markets including Chemical Processing, Semiconductor, Power Generation, Aerospace, Oil & Gas, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Petrochemical & Refining, Air Pollution Control and Water Treatment.
Frequently Asked Questions
Common questions about Sunmach Incoloy Bolts
They are used for high-stress fastening and maintaining joint tension in extreme high-temperature environments where standard stainless steel fasteners would soften, creep, or deform. Typical applications include gas turbines in power generation, high-temperature steam systems, petrochemical furnace piping, chemical reactors, and commercial heat-treatment furnaces.
Standard stainless steel (such as 316L) loses its mechanical strength rapidly once operating temperatures exceed 600°C. Incoloy 800HT bolts are specifically engineered to remain structurally stable and resist oxidation at continuous operating temperatures up to 900°C, preventing joint loosening or bolt stretching over long-term thermal cycles.
Incoloy 800HT contains controlled additions of titanium and aluminum. When the alloy undergoes specialized heat treatment, these elements form microscopic precipitates within the metal that lock the grain structure in place, preventing the metal grains from shifting or stretching under high temperatures and heavy clamping forces.
Standard Stainless Steel is adequate up to 600°C, while Incoloy 800HT is optimal for continuous 900°C service and is highly cost-effective for high-temperature-only service. Inconel (like 600 or 625) provides superior corrosion resistance in extreme, aggressive acid environments, but at roughly double the material cost of Incoloy.
Creep rupture testing (ASTM E139) proves that the Incoloy bolt maintains its structural strength under sustained loading over extended periods at high temperatures. Without this verification, fasteners can slowly stretch or deform over time, resulting in a gradual loss of joint clamping force, causing joint leakage or catastrophic failure under pressure.