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Incoloy 800HT Washers Manufacturer & Exporter in India

Explore Incoloy 800HT Washers 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 800HT Washers?

Incoloy 800HT washers are high-temperature nickel-iron-chromium alloy flat, spring, and lock washers manufactured from UNS N08811 bar or plate, conforming to ASTM B409 and B408. The alloy’s enhanced carbon (0.06-0.10%) and aluminum/titanium content provide superior creep and rupture strength compared to standard Incoloy 800, making these washers ideal for bolted joints exposed to sustained temperatures up to 1100°C.

Incoloy 800HT washers are specified for use in petrochemical furnace hardware, heat exchanger assemblies, and power plant superheater connections where resistance to oxidation, carburization, and thermal cycling is critical. All washers are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 800HT
UNS NumberN08811
DIN Number1.4959 / 1.4876
Material StandardASTM B409 / B408
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Tab, Belleville
Size RangeM6-M100 / ¼"-4"
Tensile Strength600 MPa (87 ksi) min
Yield Strength275 MPa (40 ksi) min
HardnessMax 90 HRB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Incoloy 800HT Fastener Products Available from RealBolt

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

Technical Data

Incoloy 800HT Washers Dimensions, Sizes & Thread Standards

Incoloy 800HT Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), and ASME B18.22.1. Custom OD/ID and thicknesses available. Metric and inch sizes supplied to order. All Incoloy 800HT washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Ø (mm)Outer Ø (mm)Thickness (mm)
M66.4121.6
M88.4161.6
M1010.5202.0
M1213.0242.5
M1617.0303.0
M2021.0373.0
M2425.0444.0
M3031.0564.0
M3637.0665.0
M4243.0786.0
M4849.0926.0
M5657.01058.0
M6465.01158.0
M7273.013010.0
M8081.014010.0
M100101.018012.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 9021Large OD washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM B409Plate/sheet - UNS N08811
ASTM B408Bar/rod - UNS N08811
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800HT Chemical Composition

Incoloy 800HT Washers 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 B409/B408

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.06-0.10
Aluminum (Al)0.25-0.60
Titanium (Ti)0.25-0.60
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 800HT Alloy Composition Matters for Washers

High Nickel & Chromium — Oxidation Resistance
The high nickel and chromium content in Incoloy 800HT provides outstanding resistance to oxidation and carburization at elevated temperatures, ensuring washer integrity in furnace and heat exchanger assemblies.
Al + Ti (0.25–0.60%) — Creep Strength
Aluminum and titanium additions promote precipitation hardening, significantly improving creep and rupture strength for washers under sustained high-temperature loads.
Controlled Carbon (0.06–0.10%)
The controlled carbon content prevents embrittlement and grain boundary carbide precipitation, maintaining ductility and mechanical stability in cyclic thermal environments.

Fastener Performance

Incoloy 800HT Washers Mechanical Properties & Torque Reference

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

Bolt SizeRecommended Washer OD (mm)Recommended Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Washer Selection: Use matching Incoloy 800HT washers with 800HT bolts/nuts for high-temperature assemblies. For spring or lock washers, consult engineering for thermal cycling applications.

Industry Applications

Incoloy 800HT Washers Applications — Industries & End Uses

Incoloy 800HT Washers 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 800HT washers are specified for tube sheet assemblies, radiant coil supports, and burner hardware in ethylene cracking furnaces and hydrogen reformers, where resistance to oxidation and carburization at 1000°C+ is essential for long-term reliability.
Used in superheater header connections, HRSG ducting, and boiler tube supports, Incoloy 800HT washers maintain preload and prevent bolt relaxation under thermal cycling and high-pressure steam conditions.
Flat and spring washers for channel covers, floating heads, and nozzle flanges in high-temperature heat exchangers and pressure vessels handling ammonia, nitric acid, and process gases.
Incoloy 800HT washers are used in bolted joints for industrial ovens, kilns, and annealing furnaces, providing dimensional stability and oxidation resistance during repeated heating and cooling cycles.

Incoloy 800HT Washers Standards & International Certifications

Incoloy 800HT Washers 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 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 IS 5372 IS 1367
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Incoloy 800HT Washers 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 800HT washers selection and pricing.
Incoloy 800HT washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), ISO 7089/7090, and ASME B18.22.1 (inch). Custom profiles such as Belleville, tab, and wave washers can be supplied to drawing or international standards. All washers are manufactured from ASTM B409/B408 certified material.
Yes – Incoloy 800HT washers are engineered for continuous service up to 1100°C, maintaining mechanical integrity and resisting oxidation, carburization, and creep. They are widely specified for furnace, reformer, and superheater assemblies operating at extreme temperatures.
Incoloy 800HT offers excellent resistance to chloride-induced stress corrosion cracking, especially in high-temperature and acidic environments. This makes them suitable for chemical processing, acid gas ducting, and heat exchanger applications where stainless steel washers may fail.
Standard sizes (M8-M36) are available ex-stock with no formal MOQ – single pieces can be supplied for urgent maintenance. Custom sizes or profiles typically require a 10 kg minimum order. Price breaks are available 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