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Incoloy 800H Nuts Manufacturer & Exporter in India

Explore Incoloy 800H Nuts 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 Nuts?

Incoloy 800H nuts are high-temperature, corrosion-resistant fasteners manufactured from nickel-iron-chromium alloy UNS N08810, conforming to ASTM B408 and ASTM B564. The alloy’s increased carbon content (0.05-0.10%) and controlled grain size provide enhanced creep and rupture strength at temperatures above 600°C, making these nuts ideal for demanding thermal cycling and oxidation environments.

Incoloy 800H nuts are widely specified for petrochemical furnace hardware, heat exchanger closures, and superheater assemblies where standard stainless steel fasteners fail due to thermal embrittlement or carburization. All nuts are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 800H
UNS NumberN08810
DIN Number1.4958
Material StandardASTM B408 / ASTM B564
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M64 / ¼"-2½"
Tensile Strength450 MPa (65 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 90 HRB / 200 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 Bolts, 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 Bolts
Incoloy 800H Screws
Incoloy 800H Washers
Incoloy 800H Studs
Incoloy 800H Threaded Rods

Technical Data

Incoloy 800H Nuts Dimensions, Sizes & Thread Standards

Incoloy 800H Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread pitches and heights available. Inch dimensions per ASME B18.2.2. All Incoloy 800H nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch from

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105.0
M81.25136.5
M101.5178.0
M121.751910.0
M162.02413.0
M202.53016.0
M243.03619.0
M303.54624.0
M364.05529.0
M424.56534.0
M485.07538.0
M565.58545.0
M646.09551.0

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ISO 2320Prevailing torque nutsMetric
Material StandardRequirement
ASTM B408Bar/rod - UNS N08810
ASTM B564Forged nuts - 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 Nuts 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 / B564

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 Nuts

High Nickel & Chromium — Oxidation Resistance
The 30–35% nickel and 19–23% chromium content ensures Incoloy 800H nuts resist scaling and oxidation at temperatures up to 1100°C, making them ideal for furnace and heat exchanger assemblies.
Al + Ti Stabilisation — Creep Strength
Aluminium and titanium additions stabilize the austenitic structure, preventing grain growth and providing superior creep and rupture strength at elevated temperatures, critical for bolted joints in thermal cycling service.
Controlled Carbon — Thermal Stability
The higher carbon content (0.05–0.10%) in 800H compared to 800 improves stress rupture properties, ensuring nuts maintain preload and integrity in high-temperature environments.

Fastener Performance

Incoloy 800H Nuts Mechanical Properties & Torque Reference

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

Nut SizeRecommended Torque (Nm)Clamp Load (kN)
M126528
M1616057
M2032089
M24550128
M301100205
M361900295
M423000410
M484400540
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Avoid copper-based anti-seize on nickel alloys.

Industry Applications

Incoloy 800H Nuts Applications — Industries & End Uses

Incoloy 800H Nuts 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 nuts are the preferred choice for bolting radiant coils, tube sheets, and structural supports in ethylene cracking furnaces, reformers, and hydrogen production units. Their high creep strength and resistance to carburization ensure long-term reliability at temperatures up to 1100°C.
Used for bolting superheater headers, HRSG ductwork, and steam generator closures where thermal cycling and oxidation resistance are critical. Incoloy 800H nuts maintain preload and resist embrittlement in high-temperature steam and flue gas environments.
Specified for channel covers, tube sheets, and closure hardware in heat exchangers and pressure vessels handling high-temperature process streams, nitric acid, or ammonia. Their stability prevents stress relaxation and galling under repeated thermal cycling.
Incoloy 800H nuts are used in nuclear fuel reprocessing, nitric acid evaporators, and chemical reactors where resistance to intergranular corrosion and chloride stress corrosion cracking is required.

Incoloy 800H Nuts Standards & International Certifications

Incoloy 800H Nuts 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 934 ISO 4032 ASME B18.2.2 IS 1364 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabEN 10204 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800H Nuts — 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 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800H Nuts 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 nuts selection and pricing.
Incoloy 800H nuts are available to DIN 934 (metric hex), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Prevailing torque and lock nut types can be supplied per ISO 2320. Custom thread forms (UNC, UNF, BSW) are available on request with short lead times.
Yes – always use a nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and bearing surfaces to prevent galling and facilitate disassembly after high-temperature exposure. Avoid copper-based anti-seize to prevent galvanic corrosion.
Absolutely. Incoloy 800H nuts are specifically designed for resistance to carburization, oxidation, and reducing atmospheres at elevated temperatures, making them ideal for furnace, reformer, and heat treating applications.
There is no formal MOQ for standard sizes (M10-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or special coatings may require a 10 kg 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