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Incoloy 800 Nuts Manufacturer & Exporter in India

Explore Incoloy 800 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 800 Nuts?

Incoloy 800 nuts are high-temperature, corrosion-resistant fasteners manufactured from nickel-iron-chromium alloy UNS N08800, conforming to ASTM B408 and ASTM B564. Designed for service in environments up to 800°C, these nuts maintain mechanical integrity and resist carburization, oxidation, and chloride stress corrosion cracking.

Incoloy 800 nuts are widely specified for petrochemical furnace hardware, heat exchanger closures, and superheater assemblies where stainless steel fasteners fail due to thermal embrittlement or aggressive media. Their balanced composition ensures dimensional stability and long-term reliability in cyclic thermal conditions.

Quick Specifications

MaterialIncoloy 800
UNS NumberN08800
DIN Number1.4876
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 85 HRB / 200 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Incoloy 800 Fastener Products Available from RealBolt

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

Technical Data

Incoloy 800 Nuts Dimensions, Sizes & Thread Standards

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

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

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105
M81.25136.5
M101.5178
M121.751910
M162.02413
M202.53016
M243.03619
M303.54624
M364.05529
M424.56534
M485.07538
M565.58545
M646.09551

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
BS 1768Hex nuts (inch)BSW/BSF
Material StandardRequirement
ASTM B408Bar/rod - UNS N08800
ASTM B564Forged nuts - UNS N08800
ASTM F468Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800 Chemical Composition

Incoloy 800 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

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.10 max
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 available on request.

Why Incoloy 800 Alloy Composition Matters for Nuts

High Nickel & Chromium — Oxidation & Carburization Resistance
The high nickel (30–35%) and chromium (19–23%) content in Incoloy 800 nuts provides outstanding resistance to oxidation, carburization, and nitriding at elevated temperatures, making them ideal for furnace and heat exchanger applications.
Al + Ti Stabilization — Prevents Sensitization
Aluminium and titanium additions stabilize the alloy against intergranular corrosion and prevent sensitization during prolonged exposure to high temperatures, ensuring long-term reliability of nut threads and bearing surfaces.
Iron Balance — Dimensional Stability
The iron-rich matrix of Incoloy 800 ensures excellent dimensional stability and mechanical strength under cyclic thermal loading, preventing nut loosening or thread deformation in service.

Fastener Performance

Incoloy 800 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800 Nuts per ASTM. Incoloy 800 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)
M127032
M1617077
M20340123
M24580178
M301160283
M362020411
M423240566
M484800744
?? 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 800 Nuts Applications — Industries & End Uses

Incoloy 800 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.
Furnace tube sheet nuts, radiant coil supports, and transfer line hardware in ethylene, hydrogen, and ammonia reformers. Incoloy 800 nuts resist carburization and oxidation at temperatures up to 800°C, outperforming stainless steel in cyclic service.
Hex nuts and lock nuts for superheater header connections, HRSG ductwork, and steam generator closures. Incoloy 800 maintains mechanical strength and prevents nut seizure under thermal cycling and high-pressure steam.
Used for heat exchanger channel covers, reactor closures, and pressure vessel nozzles in nitric acid, urea, and organic acid environments where resistance to chloride stress corrosion cracking is critical.
Securing fixtures, baskets, and trays in heat treatment furnaces, annealing lines, and continuous ovens. Incoloy 800 nuts provide long service life in oxidizing and reducing atmospheres.

Incoloy 800 Nuts Standards & International Certifications

Incoloy 800 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 LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Incoloy 800 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 800 nuts selection and pricing.
Incoloy 800 hex nuts are available to DIN 934 (metric), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Special thread forms such as BSW, BSF, and custom fine pitch are available on request. Lock nuts, jam nuts, and slotted nuts can be supplied per customer specification.
Nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) is recommended for Incoloy 800 nuts. Apply to threads and bearing surfaces to prevent galling and facilitate disassembly after high-temperature exposure. Avoid copper-based anti-seize to prevent galvanic corrosion.
Yes – Incoloy 800 nuts are engineered for continuous service up to 800°C and resist oxidation, carburization, and thermal embrittlement. They are widely specified for furnace tube sheets, radiant coil supports, and reformer hardware in petrochemical and power generation industries.
No formal MOQ for standard sizes (M8-M36) held ex-stock – single pieces can be supplied for urgent maintenance. Custom sizes or special thread forms may require a 10 kg minimum. Quantity price breaks are available at 50 pcs, 200 pcs, and 500 pcs.

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