Incoloy Fasteners Supplier
MT.BOLTS manufactures Incoloy fasteners using high-performance nickel-iron-chromium-based alloys such as Incoloy 800, Incoloy 800H, Incoloy 825, and Incoloy 925. These fasteners are engineered for excellent corrosion resistance in high-temperature and aggressive chemical environments. They are widely used in heat exchangers, power plants, marine environments, oil & gas equipment, and chemical processing systems.
Our INCOLOY fasteners have the following specifications:
- Diameter: M3 to M64 | #4 to 2.5″
- Length: 6mm to 500mm | 0.25″ to 20″
- Thread Pitch: Metric (Coarse/Fine) | UNC/UNF
- Standards: ASME B18.2.1, ASME B18.3, ASME B18.2.2, DIN/ISO/EN (e.g., DIN 933, DIN 934)
- Material Specifications: ASTM B408 (Incoloy 800 series), ASTM B564, ASTM B425 (Incoloy 825), ASTM B805 (Incoloy 925)
- Types: Bolts, Screws, Nuts, Washers, Studs
We regularly supply Incoloy fasteners and bolts in the following material grades: Incoloy 800, 800H, 800HT, 825, and 925. Their chemical compositions and physical properties are provided below for your procurement reference.
| Alloy Grade | UNS Number | Key Characteristics |
| Incoloy 800 | N08800 | Stable structure and good high-temperature strength; excellent resistance to oxidation and carburization |
| Incoloy 800H | N08810 | Higher carbon version with improved creep and rupture strength |
| Incoloy 800HT | N08811 | Optimized aluminum and titanium content; enhanced for high-temperature strength |
| Incoloy 825 | N08825 | Excellent resistance to sulfuric, phosphoric, and nitric acids; resists pitting, crevice, and stress corrosion cracking |
| Incoloy 925 | N09925 | Precipitation-hardened version of Incoloy 825; combines high strength with corrosion resistance |
Incoloy Fasteners Chemical Composition
| Element | Incoloy 800 | Incoloy 800H / 800HT | Incoloy 825 | Incoloy 925 |
| Nickel (Ni) | 30.0–35.0 | 30.0–35.0 | 38.0–46.0 | 42.0–46.0 |
| Chromium (Cr) | 19.0–23.0 | 19.0–23.0 | 19.5–23.5 | 19.5–22.5 |
| Iron (Fe) | Balance | Balance | Balance | Balance |
| Carbon (C) | ≤ 0.10 | 0.05–0.10 (800H), ≤0.06 (800HT) | ≤ 0.05 | ≤ 0.03 |
| Aluminum (Al) | 0.15–0.60 | 0.15–0.60 | ≤ 0.2 | 0.15–0.50 |
| Titanium (Ti) | ≤ 0.40 | ≤ 0.60 | 0.6–1.2 | 1.9–2.4 |
| Molybdenum (Mo) | — | — | 2.5–3.5 | 2.5–3.5 |
| Copper (Cu) | ≤ 0.75 | ≤ 0.75 | 1.5–3.0 | ≤ 0.5 |
| Niobium + Ta (Nb) | — | — | — | 0.5–1.5 |
| Manganese (Mn) | ≤ 1.5 | ≤ 1.5 | ≤ 1.0 | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 | ≤ 1.0 | ≤ 0.5 | ≤ 0.5 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 | ≤ 0.03 | ≤ 0.01 |
Incoloy Fasteners Mechanical Properties
| Property | Incoloy 800 | Incoloy 800H | Incoloy 800HT | Incoloy 825 | Incoloy 925 (Age-Hardened) |
| Tensile Strength (MPa) | ≥ 520 | ≥ 450 | ≥ 450 | ≥ 585 | ≥ 760 |
| Yield Strength (MPa) | ≥ 205 | ≥ 170 | ≥ 170 | ≥ 220 | ≥ 450 |
| Elongation (%) | ≥ 30 | ≥ 30 | ≥ 30 | ≥ 30 | ≥ 20 |
| Hardness (HB) | ≤ 150 | ≤ 150 | ≤ 150 | ≤ 200 | ≤ 300 |
| Max Service Temp. (°C) | ~ 800°C | ~ 1100°C | ~ 1100°C | ~ 540°C | ~ 650°C |
Incoloy Fastener Types
MT.BOLTS offers a comprehensive range of Incoloy Fasteners for your selection to meet various application requirements:
Incoloy Hex Head Screw Bolts
Incoloy Square Head Bolts
Incoloy Flange Bolts
Incoloy Serrated Flange Bolts
Incoloy Eye bolts
Incoloy Carriage Bolts
Incoloy Elevator Bolts
Incoloy U-Bolts
Incoloy Anchor Bolts
Incoloy Expansion Bolt
Incoloy Lag Bolts
Incoloy U-Bolts
Incoloy Hex Head Lag Screws
Incoloy Shoulder Screws
Incoloy Socket Cap Screws
Incoloy Self-Tapping Screws
Incoloy Hex Nuts
Incoloy Serrated Flange Nuts
Incoloy Lock Nuts
Incoloy Wing Nuts
Incoloy Coupling Nut
Incoloy Square Nuts
Incoloy Acorn Nuts
Incoloy Wing Nuts
Incoloy Fully Threaded Rods & Studs
Incoloy Equal Thread Length Rods & Studs
Incoloy Unequal Thread Length Rods & Studs
Incoloy Single End Threaded Studs
Incoloy Weld Studs
Incoloy Press-In Captive Studs
Incoloy Flat Washers
Incoloy Lock Washers
Incoloy Curved Washers
Incoloy Wave Washers
Incoloy Square Washers
Incoloy Belleville Washers
Why Choose MT.BOLTS
- Material Diversity
- Standardized Production
- Ample Inventory
- Competitive Pricing
- Low-MOQ Customization
Reasons to Choose Incoloy Fasteners
Incoloy fasteners are selected for their outstanding resistance to high temperatures, oxidation, and aggressive chemical environments. These nickel-iron-chromium alloys offer excellent mechanical strength and stability even under prolonged exposure to corrosive substances such as acids, seawater, and high-temperature gases. Incoloy grades like 800, 825, and 925 provide superior stress corrosion cracking resistance and long-term durability in both reducing and oxidizing environments, making them ideal for demanding industrial applications.
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Application of Incoloy Fasteners
Incoloy fasteners are widely used in industries where both heat resistance and corrosion protection are critical. Typical applications include chemical processing equipment, heat exchangers, power generation systems, offshore platforms, pollution control devices, and oil & gas exploration tools. In nuclear and marine environments, Incoloy fasteners provide reliable performance over extended service periods, even in extreme conditions.
FAQ About Incoloy Fasteners and Bolts
Incoloy fasteners are made from nickel-iron-chromium alloys such as Incoloy 800, 800H, 825, or 925, depending on the required corrosion and temperature resistance.
Incoloy fasteners are iron-based and optimized for high corrosion resistance in moderate-to-high temperatures, while Inconel fasteners are nickel-based and provide superior strength at extremely high temperatures.
Yes, especially grades like Incoloy 825 and 925, which offer excellent resistance to seawater, chlorides, and biofouling.
Common standards include ASTM B408 (Incoloy 800 series), ASTM B564, ASTM B425 (Incoloy 825), and ASTM B805 (Incoloy 925), along with dimensional standards like ASME B18.2.1, DIN 933, and ISO equivalents.
They are commonly used in chemical plants, power stations, marine structures, heat treatment systems, and oil & gas equipment.
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