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Incoloy 800H Bolts Manufacturer & Exporter in India

Explore Incoloy 800H Bolts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are Incoloy 800H Bolts?

Incoloy 800H bolts are high-temperature nickel-iron-chromium alloy fasteners manufactured from UNS N08810 bar stock in accordance with ASTM B408. The alloy’s increased carbon content (0.05-0.10%) and controlled grain size provide superior creep and rupture strength above 600°C, making these bolts ideal for demanding thermal cycling and high-pressure service.

Incoloy 800H bolts are specified for use in heat exchangers, reformer outlet manifolds, superheaters, and petrochemical process equipment where resistance to oxidation, carburization, and chloride stress corrosion cracking is critical. All bolts are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 800H
UNS NumberN08810
DIN Number1.4958
Material StandardASTM B408
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M72 / ¼"-3"
Tensile Strength450 MPa (65 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 85 HRB / 180 HB
? All material certified by NABL-accredited laboratory. PMI and grain size verification available on request.

Complete the Fastener Set

Other Incoloy 800H Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 800H fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 800H Nuts, Incoloy 800H Screws, Incoloy 800H Washers, Incoloy 800H Studs, and Incoloy 800H Threaded Rods. All Incoloy 800H fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 800H Nuts
Incoloy 800H Screws
Incoloy 800H Washers
Incoloy 800H Studs
Incoloy 800H Threaded Rods

Technical Data

Incoloy 800H Bolts Dimensions, Sizes & Thread Standards

Incoloy 800H Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All Incoloy 800H bolts dimensions are verified against applicable DIN, ISO, and ASME

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM B408Bar/rod - UNS N08810
ASTM F468Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800H Chemical Composition

Incoloy 800H Bolts are produced from an iron-nickel-chromium alloy with controlled nickel (30–46%), chromium (19–23%), and molybdenum content per ASTM. Nickel and chromium together resist high-temperature oxidation to 1093°C in 800H grades, while molybdenum and copper additions in Incoloy 825 provide sulfuric and phosphoric acid resistance.

Chemical Composition per ASTM B408

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.05-0.10
Aluminium (Al)0.15-0.60
Titanium (Ti)0.15-0.60
Manganese (Mn)1.5 max
Silicon (Si)1.0 max
Sulfur (S)0.015 max
Copper (Cu)0.75 max
? All heats verified by NABL-accredited spectrometry. PMI and grain size verification available on request.

Why Incoloy 800H Alloy Composition Matters for Bolts

High Nickel & Chromium — Oxidation & Carburization Resistance
The high nickel and chromium content in Incoloy 800H provides outstanding resistance to oxidation and carburization at elevated temperatures, ensuring bolt integrity in furnace and reformer service.
Al + Ti Stabilization — Grain Structure Control
Aluminium and titanium additions stabilize the austenitic structure, preventing grain growth and sensitization during long-term exposure to high temperatures, which is critical for creep strength in bolted joints.
Controlled Carbon — Creep Rupture Strength
The specified carbon range (0.05–0.10%) in 800H increases creep and rupture strength, making these bolts reliable for continuous operation above 600°C in petrochemical and power plant applications.

Fastener Performance

Incoloy 800H Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800H Bolts per ASTM. Incoloy 800H bolts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12524219
M1612510038
M2025020060
M2443034487
M30860688138
M3615001200200
M4224001920285
M4835502840390
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Do not use copper-based anti-seize on Incoloy alloys.

Industry Applications

Incoloy 800H Bolts Applications — Industries & End Uses

Incoloy 800H Bolts from RealBolt are specified across petrochemical furnaces, chemical processing, nuclear, and power generation where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Incoloy 800H bolts are the preferred choice for bolting in steam methane reformer outlet manifolds, radiant coils, and transfer line flanges due to their resistance to carburization and high-temperature oxidation.
Used in superheater header connections, HRSG ducting, and boiler tube sheet bolting where resistance to thermal cycling and chloride stress corrosion cracking is required above 600°C.
Bolts for furnace doors, muffle seals, and radiant tube supports in continuous annealing and heat treatment lines, where long-term stability and oxidation resistance are critical.
Flange bolts and stud sets for nitric acid, acetic acid, and urea plant reactors, where Incoloy 800H’s resistance to intergranular attack and chloride-induced cracking is essential.

Incoloy 800H Bolts Standards & International Certifications

Incoloy 800H Bolts from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 IS 1364 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

Buy Incoloy 800H Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800H Bolts — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
022-6743-7972
+91 90226 36025
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Answers for Buyers

Incoloy 800H Bolts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800H Bolts from RealBolt — covering grade differences, ASTM B408/B425 standards, oxidation limits, acid resistance, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Incoloy 800H bolts selection and pricing.
Incoloy 800H bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts for flanges are supplied per ASME B16.5 and MSS SP-75. Custom thread forms (BSW, BSF, Whitworth) can be manufactured on request with short lead times.
Use nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on all Incoloy 800H bolt threads and nut faces. This prevents galling and ensures consistent preload. Do not use copper-based anti-seize as it may cause galvanic corrosion at high temperatures.
Yes – Incoloy 800H bolts are engineered for continuous service up to 1100°C, with excellent resistance to oxidation, carburization, and thermal cycling. Their controlled carbon and grain size provide superior creep and rupture strength for long-term bolted joint integrity.
No MOQ for standard sizes (M12-M36) available ex-stock. Custom sizes or non-standard threads typically require a 10 kg minimum. Flange stud bolt sets are supplied per set with no minimum. Quantity discounts apply at 50, 200, and 500 pieces.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil