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Incoloy 800H Washers Manufacturer & Exporter in India

Explore Incoloy 800H 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 800H Washers?

Incoloy 800H washers are high-temperature nickel-iron-chromium alloy fasteners manufactured from UNS N08810 bar or plate, conforming to ASTM B409 and ASTM B564. Designed for superior strength and oxidation resistance at elevated temperatures, these washers are solution-annealed and controlled for grain size to ensure optimal creep and rupture properties above 600°C.

Incoloy 800H washers are widely specified for bolted joints in heat exchangers, reformer tubes, and petrochemical process equipment where standard stainless steel washers fail due to thermal embrittlement or carburization. Their balanced composition provides excellent resistance to oxidation, carburization, and nitriding atmospheres, making them a preferred choice for critical high-temperature bolted assemblies.

Quick Specifications

MaterialIncoloy 800H
UNS NumberN08810
DIN Number1.4958
Material StandardASTM B409 / ASTM B564
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Fender, Tab, Belleville
Size RangeM6-M100 / ¼"-4"
Tensile Strength450 MPa (65 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 85 HRB
? All washers supplied with full traceability and NABL-accredited test reports. PMI and grain size verification available.

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 Nuts, Incoloy 800H Screws, 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 Nuts
Incoloy 800H Screws
Incoloy 800H Studs
Incoloy 800H Threaded Rods

Technical Data

Incoloy 800H Washers Dimensions, Sizes & Thread Standards

Incoloy 800H Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), and ASME B18.22.1. Custom OD/ID and thickness available. Metric and inch sizes supplied to order. All Incoloy 800H 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 9021Fender washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM B409Plate/sheet - UNS N08810
ASTM B564Forged washers
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800H Chemical Composition

Incoloy 800H 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

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 spectro-tested and certified by NABL-accredited laboratory. PMI available for every batch.

Why Incoloy 800H Alloy Composition Matters for Washers

High Nickel & Chromium — Oxidation Resistance
The 30–35% nickel and 19–23% chromium content in Incoloy 800H provides outstanding resistance to oxidation and carburization at temperatures up to 1100°C, ensuring washers retain integrity in furnace and reformer service.
Al + Ti Stabilization — Creep Strength
Aluminium and titanium additions stabilize the alloy against sensitization and grain boundary embrittlement, delivering superior creep and rupture strength for bolted joints under sustained high temperatures.
Low Carbon — Intergranular Corrosion Resistance
The controlled carbon content (0.05–0.10%) minimizes carbide precipitation, making Incoloy 800H washers reliable for use in thermal cycling and reducing the risk of intergranular attack.

Fastener Performance

Incoloy 800H Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800H Washers per ASTM. Incoloy 800H 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 Washer Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Washer Selection: Always match washer OD and thickness to bolt size and flange design. For high-temperature service, use only solution-annealed Incoloy 800H washers with certified grain size control.

Industry Applications

Incoloy 800H Washers Applications — Industries & End Uses

Incoloy 800H 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 800H washers are the preferred choice for supporting and spacing tube sheets, baffles, and tube hangers in steam reformers, ethylene cracking furnaces, and radiant coil assemblies. Their high creep strength and oxidation resistance ensure reliable performance at temperatures up to 1100°C in carburizing and nitriding atmospheres.
Flat and spring washers for bolted joints in hydrogen reformers, ammonia converters, and process gas heaters. Incoloy 800H washers prevent bolt relaxation and maintain joint integrity during thermal cycling and exposure to high-pressure reducing gases.
Washers for superheater header connections, HRSG ducting, and boiler tube supports where resistance to high-temperature oxidation and sulfidation is critical. Incoloy 800H washers outperform stainless steel in thermal fatigue and creep-prone environments.
Used as load-spreading washers and spacers in shell & tube heat exchangers, pressure vessel manways, and channel covers. Their low carbon and stabilized chemistry prevent intergranular attack during repeated thermal cycling.

Incoloy 800H Washers Standards & International Certifications

Incoloy 800H 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 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800H 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.
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Answers for Buyers

Incoloy 800H Washers — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800H 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 800H washers selection and pricing.
Incoloy 800H washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (fender), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing or project specification. All washers are manufactured from ASTM B409 plate or ASTM B564 forgings with full traceability.
Yes – Incoloy 800H washers are engineered for continuous service at temperatures up to 1100°C. Their stabilized chemistry and controlled grain size provide excellent creep and rupture strength, making them ideal for furnace, reformer, and superheater applications where standard stainless steel washers fail.
Absolutely. The high nickel and chromium content of Incoloy 800H provides outstanding resistance to oxidation, carburization, and nitriding atmospheres. This makes them the preferred choice for washers in petrochemical, furnace, and heat treatment equipment.
No formal MOQ for standard sizes (M6-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or special types (spring, tab, fender) typically 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