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Nimonic 75 Washers Manufacturer & Exporter in India

Explore Nimonic 75 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 75 Washers?

Nimonic 75 washers are precision-engineered flat, spring, and lock washers manufactured from nickel-chromium alloy UNS N06075, conforming to ASTM B637. This alloy, containing approximately 80% nickel and 20% chromium with controlled additions of titanium and carbon, is renowned for its excellent oxidation resistance and mechanical stability at elevated temperatures up to 1100°C.

Nimonic 75 washers are widely specified for bolted joints in gas turbines, heat exchangers, and high-temperature process equipment where standard stainless steel washers fail due to creep or scaling. Their consistent hardness and dimensional stability ensure reliable load distribution and joint integrity in the most demanding thermal cycling environments.

Quick Specifications

MaterialNimonic 75
UNS NumberN06075
DIN Number2.4951
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 Strength800 MPa (116 ksi) min
Yield Strength340 MPa (49 ksi) min
HardnessMax 220 HB
? All washers supplied with full traceability and NABL-accredited test certification. PMI and hardness survey available on request.

Complete the Fastener Set

Other Nimonic 75 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Nimonic 75 fastener range from certified nickel-chromium-cobalt superalloy bar stock, including Nimonic 75 Bolts, Nimonic 75 Nuts, Nimonic 75 Screws, Nimonic 75 Studs, and Nimonic 75 Threaded Rods. All Nimonic 75 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Nimonic 75 Bolts
Nimonic 75 Nuts
Nimonic 75 Screws
Nimonic 75 Studs
Nimonic 75 Threaded Rods

Technical Data

Nimonic 75 Washers Dimensions, Sizes & Thread Standards

Nimonic 75 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville), and ISO 7089/7090. Custom OD/ID and thickness available. Inch sizes per ASME B18.22.1. All Nimonic 75 washers dimensions are verified against applicable DIN, ISO, and ASME B18

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Size (M)Inner Dia (mm)Outer Dia (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
ISO 7089Plain washersMetric
ASME B18.22.1Plain & lock washersInch
Material StandardRequirement
ASTM B637Bar/rod - UNS N06075
BS HR5Washer mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Nimonic 75 Chemical Composition

Nimonic 75 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)72.0 min
Chromium (Cr)19.0-21.0
Iron (Fe)5.0 max
Titanium (Ti)0.2-0.6
Carbon (C)0.08-0.15
Manganese (Mn)1.0 max
Silicon (Si)1.0 max
Copper (Cu)0.5 max
Sulphur (S)0.015 max
? All heats spectro-tested and certified by NABL-accredited laboratory. PMI available on request.

Why Nimonic 75 Alloy Composition Matters for Washers

High Nickel & Chromium — Oxidation Resistance
The high nickel and chromium content in Nimonic 75 provides outstanding resistance to scaling and oxidation at temperatures up to 1100°C, ensuring washers retain their mechanical properties and surface integrity in extreme heat.
Titanium & Carbon — Creep Strength
Titanium and controlled carbon additions enhance creep resistance, making Nimonic 75 washers ideal for bolted joints exposed to prolonged high-temperature service where dimensional stability is critical.
Low Sulphur — Prevents Hot Corrosion
Strict sulphur limits reduce the risk of hot corrosion and embrittlement, ensuring long-term reliability in aggressive gas turbine and furnace atmospheres.

Fastener Performance

Nimonic 75 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Nimonic 75 Washers per ASTM. Nimonic 75 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)
M6121.6
M8161.6
M10202.0
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
?? Installation: For high-temperature bolted joints, use Nimonic 75 washers with matching alloy bolts/nuts to prevent galvanic corrosion and maintain joint integrity under thermal cycling.

Industry Applications

Nimonic 75 Washers Applications — Industries & End Uses

Nimonic 75 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 75 washers are the preferred choice for turbine casing joints, combustor assemblies, and exhaust flange connections in gas turbines and jet engines, where resistance to scaling and creep at 900-1100°C is critical for long-term reliability.
Flat and spring washers for radiant tube supports, furnace door assemblies, and high-temperature reactor closures in ethylene crackers and reformers, where standard stainless washers fail due to scaling or creep deformation.
Washers for bolted joints in heat recovery steam generators (HRSG), superheater tube sheets, and boiler manways, providing oxidation resistance and mechanical stability in cyclic thermal environments.
Nimonic 75 washers are used in aircraft engine nacelles, afterburner assemblies, and missile exhaust systems, where high-temperature strength and dimensional stability are essential for safety-critical fasteners.

Nimonic 75 Washers Standards & International Certifications

Nimonic 75 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 75 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Nimonic 75 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 75 Washers — Frequently Asked Questions

Browse expert answers to common questions about Nimonic 75 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 75 washers selection and pricing.
Nimonic 75 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing or special standards for OEM and MRO applications.
While Nimonic 75 washers can be used with stainless steel bolts, it is recommended to use matching alloy fasteners in high-temperature or corrosive environments to prevent galvanic corrosion and ensure consistent thermal expansion.
Yes – Nimonic 75 washers are specifically designed for continuous service up to 1100°C, maintaining oxidation resistance and mechanical stability where standard stainless or carbon steel washers would fail.
No formal MOQ for standard sizes (M6-M24) held ex-stock. Custom sizes or profiles have an MOQ of 5 kg or 100 pieces. Sample orders and urgent requirements are accepted for maintenance and shutdowns.

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