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Inconel 601 Washers Manufacturer & Exporter in India

Explore Inconel 601 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 601 Washers?

Inconel 601 washers are nickel-chromium-aluminium alloy fastener components manufactured from UNS N06601 bar or plate stock conforming to ASTM B168 / ASTM B564. The alloy’s exceptional oxidation resistance derives from a tightly adherent alumina-rich oxide scale formed by the 1.0-1.7% aluminium content working in concert with 21-25% chromium, providing continuous service capability to 1230°C.

Inconel 601 washers are specified wherever standard stainless steel or even Inconel 625 washers cannot withstand cyclic high-temperature oxidation, carburisation, or nitriding atmospheres. They are widely used under bolt heads and nuts in furnace construction, heat treatment equipment, industrial combustion systems, and petrochemical reformer piping where load-bearing surfaces must resist creep relaxation and scale spalling simultaneously.

Quick Specifications

MaterialInconel 601
UNS NumberN06601
DIN Number2.4851
Material StandardASTM B168 / ASTM B564
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1 / ASME B18.21.1
Types AvailableFlat, Spring, Fender, Taper, Dock
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength550 MPa (80 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 88 HRB / 183 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 601 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 601 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 601 Bolts, Inconel 601 Nuts, Inconel 601 Screws, Inconel 601 Studs, and Inconel 601 Threaded Rods. All Inconel 601 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 601 Bolts
Inconel 601 Nuts
Inconel 601 Screws
Inconel 601 Studs
Inconel 601 Threaded Rods

Technical Data

Inconel 601 Washers Dimensions, Sizes & Thread Standards

Inconel 601 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 B18.22.1. All Inconel 601 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

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

Bolt Size (M)ID (mm)OD (mm)Thickness (mm)Large OD DIN 9021 (mm)
M66.4121.618
M88.4161.624
M1010.5202.030
M1213.0242.537
M1617.0303.050
M2021.0373.060
M2425.0444.072
M3031.0564.092
M3637.0665.0110
M4243.0787.0130
M4850.0928.0150
M5658.01059.0175
M6466.01159.0200
M7274.012510.0220
M8082.014012.0250
M100104.017514.0310

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 B18.22.1Plain washersInch
ASME B18.21.1Lock washersInch
ASME B16.5Flange washer setsInch
Material StandardRequirement
ASTM B168Plate/sheet/strip - UNS N06601
ASTM B564Forgings - UNS N06601
ASTM F432Washer mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 601 Chemical Composition

Inconel 601 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 B168

ElementComposition (%)
Nickel (Ni)58.0-63.0%
Chromium (Cr)21.0-25.0%
Iron (Fe)Balance (approx. 14%)
Aluminium (Al)1.0-1.7%
Carbon (C)0.10% max
Manganese (Mn)1.0% max
Silicon (Si)0.50% max
Copper (Cu)1.0% max
Sulphur (S)0.015% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 601 Alloy Composition Matters for Washers

Al (1.0–1.7%) — Alumina Scale Formation
Aluminium promotes the formation of a dense, adherent Al2O3 oxide layer on the washer surface at elevated temperatures. This scale resists spalling under thermal cycling, preventing scale contamination of mating flange faces and maintaining consistent clamp load over service life.
Cr (21–25%) — Oxidation and Carburisation Resistance
The high chromium content provides a secondary Cr2O3 barrier that protects the washer bearing surface in carburising and nitriding atmospheres encountered in heat treatment furnaces and reformer piping. This dual-oxide protection mechanism is unique to alloy 601 among standard nickel alloys.
Fe Balance — Cost-Effective High-Temperature Performance
The iron balance (approximately 14%) reduces raw material cost compared to fully nickel-based alloys while maintaining adequate creep resistance to 1100°C. For washer applications where corrosion resistance to chlorides is secondary to thermal stability, alloy 601 delivers superior value over Inconel 625 or Hastelloy C-276.

Fastener Performance

Inconel 601 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Inconel 601 Washers per ASTM. Inconel 601 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 Load Reference - Metric Flat Washers (DIN 125)

Bolt SizeID (mm)OD (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.528
M1617.0303.052
M2021.0373.082
M2425.0444.0118
M3031.0564.0190
M3637.0665.0278
M4243.0787.0385
M4850.0928.0510
?? Note: Bearing load values are indicative based on alloy 601 yield strength at room temperature. At elevated service temperatures, consult engineering for creep-adjusted load limits. Use nickel-based anti-seize on mating bolt threads.

Industry Applications

Inconel 601 Washers Applications — Industries & End Uses

Inconel 601 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 601 washers are the standard choice for bolt assemblies in continuous annealing furnaces, box furnaces, bell furnaces, and roller hearth kilns operating between 900°C and 1230°C. The alumina-rich oxide scale prevents washer-to-flange face adhesion and scale contamination during thermal cycling, maintaining reliable clamp load across thousands of heat cycles.
Flat and large-OD washers for tube support hanger bolts, refractory anchor studs, and fired heater casing flange connections in steam methane reformers (SMR), catalytic reformers, and ethylene cracking furnaces. Alloy 601 resists carburisation and nitriding atmospheres that rapidly degrade 310 stainless steel washer alternatives.
Washer sets for combustion chamber casing bolts, transition duct attachment hardware, and exhaust stack flange connections in industrial gas turbines. Also specified for grate and refractory anchor bolting in municipal solid waste (MSW) incinerators where HCl-bearing combustion gases combine with temperatures above 900°C.
Inconel 601 washers are used under stud bolt nuts on reactor closure flanges, catalyst bed support grids, and high-temperature pressure vessel nozzle connections in sulphuric acid plants, nitric acid plants, and ammonia synthesis loops where oxidising conditions at elevated temperature exceed the capability of 321 or 347 stainless steel.

Inconel 601 Washers Standards & International Certifications

Inconel 601 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 / 3.2AMS 5715

Buy Inconel 601 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel 601 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 601 Washers — Frequently Asked Questions

Browse expert answers to common questions about Inconel 601 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 601 washers selection and pricing.
Inconel 601 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7093 for metric sizes. Inch sizes are produced per ASME B18.22.1 (plain washers) and ASME B18.21.1 (lock washers). Flange washer sets for ASME B16.5 applications are available in Class 150 through Class 2500. Custom profiles including taper washers, dock washers, and fender washers are available with 15 working day lead time.
Inconel 601 washers can be used continuously up to 1230°C in oxidising atmospheres and up to approximately 1100°C in mildly reducing or cyclic thermal environments. The aluminium content (1.0-1.7%) forms a protective Al2O3 scale that resists spalling during thermal cycling – a critical advantage over 310 stainless steel or Inconel 600 washers in furnace and fired heater applications. For carburising atmospheres, the practical limit is approximately 1050°C before carbon ingress becomes significant.
Inconel 601 and Inconel 625 serve different primary functions. Inconel 601 washers are optimised for high-temperature oxidation resistance up to 1230°C and are the correct choice for furnace, fired heater, and combustion system applications. Inconel 625 washers are optimised for aqueous corrosion resistance (PREN 51+) and are specified for seawater, sour service, and chemical process environments at lower temperatures. For applications combining elevated temperature with aggressive corrosion, Inconel 617 or Hastelloy X may be more appropriate – contact our engineering team for a grade recommendation.
Yes – EN 10204 3.2 TPI-witnessed mill test certificates are available for all Inconel 601 washer orders. Third-party inspection by Bureau Veritas, SGS, TÜV, or Lloyds Register can be arranged at our Mumbai facility. Hardness surveys, dimensional inspection reports, and PMI (positive material identification) by XRF are included on request. All documentation is provided in English with full heat traceability from raw plate or bar to finished washer.

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
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  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil