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Nimonic 263 Washers Manufacturer & Exporter in India

Explore Nimonic 263 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 263 Washers?

Nimonic 263 washers are high-performance nickel-cobalt-chromium-molybdenum alloy flat, spring, and lock washers manufactured from UNS N07263 bar or sheet, conforming to ASTM B805 and AMS 5872. Designed for use in high-temperature bolted joints, these washers provide exceptional stress relaxation resistance, oxidation stability, and mechanical strength up to 800°C.

With a balanced composition of chromium (20%), cobalt (20%), and molybdenum (6%), Nimonic 263 washers are widely specified in gas turbine, aerospace, and petrochemical applications where standard stainless steel or Inconel washers fail due to creep or thermal cycling. All washers are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialNimonic 263
UNS NumberN07263
DIN Number2.4650
Material StandardASTM B805 / AMS 5872
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 6796
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Belleville, Tab, Lock
Size RangeM3-M64 / 1/8"-2.5"
Tensile Strength930 MPa (135 ksi) min
Yield Strength485 MPa (70 ksi) min
HardnessMax 32 HRC / 300 HB
? All washers supplied with NABL-accredited laboratory certification. Positive Material Identification (PMI) available on request.

Complete the Fastener Set

Other Nimonic 263 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Nimonic 263 fastener range from certified nickel-chromium-cobalt superalloy bar stock, including Nimonic 263 Bolts, Nimonic 263 Nuts, Nimonic 263 Screws, Nimonic 263 Studs, and Nimonic 263 Threaded Rods. All Nimonic 263 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Nimonic 263 Bolts
Nimonic 263 Nuts
Nimonic 263 Screws
Nimonic 263 Studs
Nimonic 263 Threaded Rods

Technical Data

Nimonic 263 Washers Dimensions, Sizes & Thread Standards

Nimonic 263 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville), and ASME B18.22.1. Custom OD/ID and thicknesses available. Metric and inch sizes supplied. All Nimonic 263 washers dimensions are verified against applicable DIN, ISO, and ASME B18

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Ø (mm)Outer Ø (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 B805Bar/sheet - UNS N07263
AMS 5872Sheet/strip for washers
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Nimonic 263 Chemical Composition

Nimonic 263 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 B805

ElementComposition (%)
Nickel (Ni)49.0 min
Chromium (Cr)19.0-21.0
Cobalt (Co)19.0-21.0
Molybdenum (Mo)5.6-6.1
Titanium (Ti)1.9-2.4
Aluminium (Al)0.5-0.6
Iron (Fe)0.7 max
Carbon (C)0.04-0.08
Silicon (Si)0.4 max
Manganese (Mn)0.6 max
Copper (Cu)0.2 max
Boron (B)0.005 max
Zirconium (Zr)0.06 max
? All heats verified by spectrometry in NABL-accredited labs. PMI available on request.

Why Nimonic 263 Alloy Composition Matters for Washers

Cr/Co/Mo Balance — High-Temperature Strength
The combination of chromium, cobalt, and molybdenum in Nimonic 263 provides outstanding resistance to stress relaxation and creep, ensuring washer integrity in bolted joints exposed to 700–800°C.
Ti/Al — Precipitation Hardening
Titanium and aluminium enable age-hardening, giving Nimonic 263 washers superior mechanical properties and dimensional stability under cyclic thermal loads.
Low Carbon & Controlled Boron
Low carbon and boron content prevent grain boundary embrittlement, making these washers reliable for long-term service in gas turbines and high-pressure reactors.

Fastener Performance

Nimonic 263 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Nimonic 263 Washers per ASTM. Nimonic 263 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)Max Temp (°C)
M6M612800
M12M1232800
M16M1660800
M20M2095800
M24M24140800
M30M30220800
M36M36320800
?? Anti-galling: Use nickel-based anti-seize for all high-temperature assemblies. Washers should be paired with matching Nimonic 263 bolts/nuts for optimal performance.

Industry Applications

Nimonic 263 Washers Applications — Industries & End Uses

Nimonic 263 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 263 washers are used in turbine casing bolted joints, combustor assemblies, and exhaust flange connections where high-temperature stress relaxation and oxidation resistance are critical for engine reliability.
Flat and spring washers for high-pressure reactor closures, heat exchanger channel covers, and process piping flanges exposed to hydrogen, ammonia, and cyclic thermal loads.
Washers for heat recovery steam generator (HRSG) ducting, flue gas desulphurisation (FGD) scrubber internals, and gas turbine exhaust systems where standard stainless washers fail due to creep.
Belleville and flat washers for nuclear reactor vessel closures, control rod drive mechanisms, and high-temperature instrumentation mounting, meeting stringent traceability and low cobalt requirements.

Nimonic 263 Washers Standards & International Certifications

Nimonic 263 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 9001:2015EN 10204 3.1/3.2NABL LabPED 2014/68/EU

Buy Nimonic 263 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Nimonic 263 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 263 Washers — Frequently Asked Questions

Browse expert answers to common questions about Nimonic 263 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 263 washers selection and pricing.
Nimonic 263 washers are supplied to DIN 125 (flat), DIN 127 (spring), DIN 6796 (Belleville), ISO 7089/7090, and ASME B18.22.1 (inch). Material conforms to ASTM B805 and AMS 5872. Custom washer geometries and dimensions are available on request.
Yes – Nimonic 263 washers are engineered for continuous service up to 800°C, maintaining mechanical strength and resisting stress relaxation. They are ideal for gas turbine, HRSG, and exhaust flange applications where standard stainless washers fail.
Absolutely. Nimonic 263’s high nickel and chromium content provides excellent resistance to hydrogen embrittlement and ammonia-induced stress corrosion cracking, making these washers suitable for petrochemical and fertilizer plant use.
No MOQ for standard sizes (M6-M24) in stock – single pieces can be supplied for urgent maintenance. Custom sizes or special types (Belleville, tab) may require a 10 kg minimum. Price breaks 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