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Inconel 718 Washers Manufacturer & Exporter in India

Explore Inconel 718 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1200

Max Temp

🌡

1200

Suitable for continuous service up to approximately 1200°C under typical operating conditions.

⚡

760

Typical tensile strength around 760 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.4

Typical density is approximately 8.4 g/cm³.

Product Overview

What are Inconel 718 Washers?

Inconel 718 washers are precipitation-hardened nickel-chromium-iron alloy fastener components manufactured from UNS N07718 bar or plate stock conforming to ASTM B637. The alloy’s exceptional strength is achieved through gamma-prime and gamma-double-prime precipitation hardening, delivering a minimum tensile strength of 1241 MPa in the aged condition – nearly double that of annealed Inconel 625.

The combination of high yield strength, outstanding fatigue resistance, and corrosion performance in aggressive media makes Inconel 718 washers the preferred choice for critical bolted joints in aerospace, oil and gas, and power generation. These washers distribute clamp load uniformly across flange faces and structural connections, preventing embedment relaxation under high bolt loads and thermal cycling. Specified under AMS 5662/5664 for aerospace and NACE MR0175/ISO 15156 for sour-service applications, Inconel 718 washers are stocked and manufactured to both metric and inch dimensions.

Quick Specifications

MaterialInconel 718
UNS NumberN07718
DIN Number2.4668
Material StandardASTM B637
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089 / ISO 7093
Washer Standard (Inch)ASME B18.21.1 / ASME B18.22.1
Types AvailableFlat / Spring / Belleville / Fender / Toothed
Inner Diameter RangeM6-M100 / ¼"-4"
Tensile Strength1241 MPa (180 ksi) min (aged)
Yield Strength1034 MPa (150 ksi) min (aged)
HardnessMax 40 HRC / 388 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 718 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 718 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 718 Bolts, Inconel 718 Nuts, Inconel 718 Screws, Inconel 718 Studs, and Inconel 718 Threaded Rods. All Inconel 718 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 718 Bolts
Inconel 718 Nuts
Inconel 718 Screws
Inconel 718 Studs
Inconel 718 Threaded Rods

Technical Data

Inconel 718 Washers Dimensions, Sizes & Thread Standards

Inconel 718 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers) / DIN 9021 (large OD) / ISO 7089 / ISO 7093. Custom OD and thickness available. Inch dimensions per ASME B18.21.1 and ASME B18.22.1.

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

Bolt Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)Large OD (DIN 9021) mm
M66.4121.618
M88.4161.624
M1010.5202.030
M1213.0242.537
M1617.0303.044
M2021.0373.056
M2425.0444.066
M3031.0564.085
M3637.0665.0100
M4243.0787.0115
M4850.0928.0130
M5658.01059.0150
M6466.01159.0165
M7274.012510.0185
M8082.014012.0200
M100104.017514.0250

Dimensional & Material Standards

StandardCoversSystem
DIN 125Flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal seriesMetric
ISO 7093Plain washers, large seriesMetric
ASME B18.21.1Lock washersInch
ASME B18.22.1Plain washersInch
ASME B16.5Flange washer setsInch
Material StandardRequirement
ASTM B637Bar/plate - UNS N07718
AMS 5662Bar, annealed
AMS 5664Bar, precipitation hardened
NACE MR0175Sour service =40 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 718 Chemical Composition

Inconel 718 Washers are manufactured from a nickel-chromium superalloy containing nickel (72% min), chromium (14–17%), and iron (6–10%). Each element is precisely controlled per ASTM — nickel provides chloride SCC immunity, chromium drives high-temperature oxidation resistance, and iron balances structural stability and alloy cost.

Chemical Composition per ASTM B637

ElementComposition (%)
Nickel + Cobalt (Ni+Co)50.0-55.0%
Chromium (Cr)17.0-21.0%
Iron (Fe)Balance
Niobium + Tantalum (Nb+Ta)4.75-5.50%
Molybdenum (Mo)2.80-3.30%
Titanium (Ti)0.65-1.15%
Aluminium (Al)0.20-0.80%
Cobalt (Co)1.0% max
Carbon (C)0.08% max
Manganese (Mn)0.35% max
Silicon (Si)0.35% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 718 Alloy Composition Matters for Washers

Nb+Ta (4.75–5.50%) — Precipitation Hardening via Gamma-Double-Prime
Niobium drives the formation of the gamma-double-prime (?'') phase during aging, which is the primary strengthening mechanism in Inconel 718. This gives washers a yield strength exceeding 1034 MPa — critical for maintaining clamp load under high bolt preload without permanent deformation or embedment.
Mo (2.80–3.30%) — Corrosion Resistance in Aggressive Media
Molybdenum enhances resistance to pitting and crevice corrosion in chloride-bearing environments. Inconel 718 washers perform reliably in sour gas service, offshore splash zones, and chemical process flanges where standard stainless steel washers suffer rapid under-head corrosion.
Ti + Al — Gamma-Prime Strengthening
Titanium and aluminium contribute to the secondary gamma-prime (?') phase, which stabilises the alloy's mechanical properties at elevated temperatures up to 650°C. This ensures Inconel 718 washers retain their load-bearing capacity in gas turbine casings, HRSG flanges, and high-temperature reactor closures without creep relaxation.

Fastener Performance

Inconel 718 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Inconel 718 Washers per ASTM. Inconel 718 washers achieve 760 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer Bearing Stress & Load Reference

Bolt SizeInner Dia (mm)Outer Dia (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.548
M1617.0303.098
M2021.0373.0155
M2425.0444.0225
M3031.0564.0360
M3637.0665.0520
M4243.0787.0720
M4850.0928.0950
?? Anti-galling note: Apply nickel-based anti-seize (Molykote P-37 or equivalent) to washer bearing faces when used with Inconel 718 bolts and nuts. Never use copper-based compounds on nickel alloys.

Industry Applications

Inconel 718 Washers Applications — Industries & End Uses

Inconel 718 Washers from RealBolt are specified across oil and gas, aerospace, chemical processing, and power generation where excellent corrosion resistance and 760 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Inconel 718 washers are specified under AMS 5662/5664 for jet engine casing flange joints, turbine disk attachment hardware, and nacelle structural connections. The alloy’s fatigue strength and resistance to stress relaxation at temperatures up to 650°C make it the standard choice for aerospace OEMs including GE Aviation, Pratt & Whitney, and Rolls-Royce.
Flat and Belleville washers in Inconel 718 are used under stud bolt nuts on ASME B16.5 wellhead flanges, BOP stack connections, and subsea tree assemblies. NACE MR0175/ISO 15156 compliant at =40 HRC. The high yield strength prevents embedment relaxation in high-pressure Class 900-2500 flange joints subjected to H2S sour service.
Inconel 718 washers are used in gas turbine exhaust casing flange joints, combustor liner attachment hardware, and heat recovery steam generator (HRSG) duct connections. The alloy’s creep resistance at 600-650°C prevents bolt load loss due to washer relaxation during thermal cycling – a common failure mode with stainless steel washers.
High-strength flat washers for reactor closure flanges, heat exchanger channel covers (TEMA Class R), and pressure vessel nozzle connections in mixed acid, halide, and high-temperature hydrocarbon environments. Inconel 718 washers maintain dimensional stability under sustained compressive load at process temperatures where 316L and duplex stainless steel washers creep and relax.

Inconel 718 Washers Standards & International Certifications

Inconel 718 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 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Inconel 718 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel 718 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

Inconel 718 Washers — Frequently Asked Questions

Browse expert answers to common questions about Inconel 718 Washers from RealBolt — covering ASTM standards, max service temperature, corrosion resistance, available sizes, lead times, and MTC certification. Contact our technical team directly for project-specific guidance on Inconel 718 washers selection and pricing.
Inconel 718 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7093 for metric dimensions. Inch washers are produced per ASME B18.21.1 (lock washers) and ASME B18.22.1 (plain washers). Belleville disc springs are manufactured per DIN 2093. Custom OD, ID, and thickness combinations are available with 15 working day lead time for non-standard profiles.
Inconel 718 washers are precipitation-hardened to a minimum tensile strength of 1241 MPa and yield strength of 1034 MPa, making them suitable for high-preload bolted joints in aerospace and high-pressure oil and gas applications. Inconel 625 washers are supplied in the annealed condition at 758 MPa tensile and offer superior corrosion resistance (PREN 51+) in seawater immersion. Choose Inconel 718 where maximum strength and fatigue resistance are the primary requirement, and Inconel 625 where long-term seawater corrosion immunity is the priority.
Yes – Inconel 718 washers are compliant with NACE MR0175/ISO 15156 when supplied in the precipitation-hardened condition with hardness not exceeding 40 HRC. Hardness survey reports are provided with each batch for sour-service orders. The alloy is listed in NACE MR0175 Table A-3 for use in H2S-containing environments at all partial pressures of H2S without restriction on temperature.
No formal MOQ applies to standard flat washer sizes (M12-M48) held ex-stock – single-piece supply is available for emergency maintenance and shutdown requirements. Custom sizes and Belleville disc springs carry a minimum order of 5 kg. Flange washer sets for ASME B16.5 applications are supplied by the set with no minimum quantity. Volume price breaks apply at 100 pcs, 500 pcs, and 2000 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
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Countries We Export To:

  • US
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