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Nimonic 90 Washers Manufacturer & Exporter in India

Explore Nimonic 90 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 Nimonic 90 Washers?

Nimonic 90 washers are high-performance nickel-chromium-cobalt alloy flat, spring, and lock washers manufactured from UNS N07090 bar or sheet, conforming to ASTM B637. Designed for extreme temperature and stress environments, these washers provide exceptional resistance to oxidation, creep, and thermal fatigue up to 950°C. Their precipitation-hardened microstructure, with titanium and aluminium additions, ensures reliable load distribution and joint integrity in critical bolted assemblies.

Nimonic 90 washers are widely specified in gas turbines, aerospace engines, and high-temperature chemical processing, where conventional stainless steel or Inconel washers would fail due to softening or scaling. All washers are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialNimonic 90
UNS NumberN07090
DIN Number2.4632
Material StandardASTM B637
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 6796
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Belleville
Size RangeM3-M64 / 1/8"-2.5"
Tensile Strength965 MPa (140 ksi) min
Yield Strength690 MPa (100 ksi) min
HardnessMax 38 HRC / 350 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Nimonic 90 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Nimonic 90 fastener range from certified nickel-chromium-cobalt superalloy bar stock, including Nimonic 90 Bolts, Nimonic 90 Nuts, Nimonic 90 Screws, Nimonic 90 Studs, and Nimonic 90 Threaded Rods. All Nimonic 90 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Nimonic 90 Bolts
Nimonic 90 Nuts
Nimonic 90 Screws
Nimonic 90 Studs
Nimonic 90 Threaded Rods

Technical Data

Nimonic 90 Washers Dimensions, Sizes & Thread Standards

Nimonic 90 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville). Custom OD/ID and thickness available. Inch sizes per ASME B18.22.1. All Nimonic 90 washers dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch

Flat Washer Dimensions - Metric (DIN 125)

Size (M)ID (mm)OD (mm)Thickness (mm)
M33.270.5
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

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 6796Belleville washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM B637Bar/sheet - UNS N07090
AMS 5829High-temp fasteners
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Nimonic 90 Chemical Composition

Nimonic 90 Washers are manufactured from a precipitation-hardened nickel-chromium-cobalt superalloy with titanium and aluminium additions per AMS and BS HR specifications. These elements form the gamma-prime (Ni₃Al,Ti) precipitate phase that delivers creep rupture strength above 700°C — a performance level unachievable with standard nickel or stainless alloys.

Chemical Composition per ASTM B637

ElementComposition (%)
Nickel (Ni)52.0 min
Chromium (Cr)18.0-21.0
Cobalt (Co)15.0-21.0
Titanium (Ti)2.0-3.0
Aluminium (Al)1.0-2.0
Iron (Fe)1.5 max
Carbon (C)0.13 max
Silicon (Si)1.0 max
Manganese (Mn)1.0 max
Zirconium (Zr)0.2 max
Boron (B)0.02 max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Nimonic 90 Alloy Composition Matters for Washers

Cr + Co — High-Temperature Strength
The combination of chromium and cobalt in Nimonic 90 provides outstanding strength retention and oxidation resistance at temperatures up to 950°C, making these washers ideal for turbine and exhaust assemblies.
Ti + Al — Precipitation Hardening
Titanium and aluminium additions enable ?' precipitation hardening, ensuring Nimonic 90 washers maintain high hardness and resist creep under sustained load at elevated temperatures.
Low Fe, Si, Mn — Corrosion & Scaling Resistance
Strict control of iron, silicon, and manganese content ensures minimal scaling and intergranular attack, even in aggressive combustion or chemical process atmospheres.

Fastener Performance

Nimonic 90 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Nimonic 90 Washers per ASTM. Nimonic 90 washers achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Bolt SizeMax Load (kN)
M6M612
M10M1028
M16M1660
M20M2095
M24M24140
M30M30220
M36M36320
?? Assembly Note: For high-temperature bolting, use Nimonic 90 washers with matching alloy bolts/nuts to prevent galvanic corrosion and maintain joint integrity above 600°C.

Industry Applications

Nimonic 90 Washers Applications — Industries & End Uses

Nimonic 90 Washers from RealBolt are specified across aerospace gas turbines, power generation, and high-temperature furnaces where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Nimonic 90 washers are specified for turbine engine casings, exhaust assemblies, and afterburner joints where extreme temperature and vibration demand high-strength, oxidation-resistant washers that maintain preload and resist creep at 900°C+.
Used in bolted joints of gas and steam turbine casings, HRSG ducting, and high-pressure steam lines. Nimonic 90 washers prevent bolt relaxation and joint leakage during thermal cycling and prolonged high-temperature service.
Washer sets for reactor closures, high-temperature flange joints, and pressure vessel manways in aggressive chemical environments where stainless steel washers would soften or corrode.
Nimonic 90 washers are used in racing exhaust manifolds, turbocharger assemblies, and cylinder head joints to maintain clamp load under rapid thermal cycling and vibration.

Nimonic 90 Washers Standards & International Certifications

Nimonic 90 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, AMS material certification, heat treatment records, and first article inspection report (FAIR) — available on request for all orders.
Standards
DIN 125A DIN 127 ISO 7089 ISO 7090 ASME B18.21.1 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Nimonic 90 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Nimonic 90 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

Nimonic 90 Washers — Frequently Asked Questions

Browse expert answers to common questions about Nimonic 90 Washers from RealBolt — covering AMS specification, heat treatment, creep rupture data, max service temperature, sizes, and aerospace certification. Contact our technical team directly for project-specific guidance on Nimonic 90 washers selection and pricing.
Nimonic 90 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville), ISO 7089/7090, and ASME B18.22.1 (inch). Custom profiles and dimensions can be manufactured to drawing or international standards such as EN 10269 and AMS 5829.
Yes – Nimonic 90 washers retain high strength, hardness, and oxidation resistance up to 950°C. They are specifically designed for turbine, exhaust, and high-temperature flange applications where stainless steel or Inconel washers would lose preload or scale.
It is recommended to use Nimonic 90 washers with matching Nimonic 90 or other nickel alloy bolts/nuts in high-temperature or corrosive environments to prevent galvanic corrosion and ensure joint integrity. For moderate temperatures, pairing with A286 or Inconel bolts is acceptable.
No MOQ for standard sizes (M6-M24) held in stock – single pieces can be supplied for urgent maintenance. Custom sizes or profiles typically require a 5 kg minimum. 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