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Inconel 625 Washers Manufacturer & Exporter in India

Explore Inconel 625 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 625 Washers?

Inconel 625 washers are precision-manufactured nickel-chromium-molybdenum alloy washers produced from UNS N06625 plate or bar stock conforming to ASTM B443 / ASTM B446. The alloy’s solid-solution strengthening through molybdenum (8-10%) and niobium (3.15-4.15%) delivers exceptional load-bearing capacity and corrosion resistance without the need for precipitation hardening.

With a PREN exceeding 51, Inconel 625 washers provide complete immunity to chloride-induced pitting and crevice corrosion beneath bolt heads and nut bearing faces – a critical performance requirement in seawater-immersed and sour-service bolted assemblies. These washers are specified under NACE MR0175/ISO 15156 for offshore flanges, subsea structural connections, and chemical process equipment worldwide.

Quick Specifications

MaterialInconel 625
UNS NumberN06625
DIN Number2.4856
Material StandardASTM B443 / ASTM B446
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, Fender, Taper, Dock, Ogee
Inner Diameter RangeM6-M100 / ¼"-4"
Tensile Strength758 MPa (110 ksi) min
Yield Strength414 MPa (60 ksi) min
HardnessMax 35 HRC / 220 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 625 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 625 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 625 Bolts, Inconel 625 Nuts, Inconel 625 Screws, Inconel 625 Studs, and Inconel 625 Threaded Rods. All Inconel 625 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 625 Bolts
Inconel 625 Nuts
Inconel 625 Screws
Inconel 625 Studs
Inconel 625 Threaded Rods

Technical Data

Inconel 625 Washers Dimensions, Sizes & Thread Standards

Inconel 625 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers, normal series) / DIN 9021 (large OD flat washers) / ISO 7089 / ISO 7093. Custom OD and thickness available. Inch dimensions per ASME B18.21.1 / 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)
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
M100104.017514.0300

Dimensional & Material Standards

StandardCoversSeries
DIN 125Flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal series, 200 HVMetric
ISO 7093Plain washers, large seriesMetric
ASME B18.21.1Lock washers - inchInch
ASME B18.22.1Plain washers - inchInch
ASME B16.5Washers for flange bolt setsInch/Metric
Material StandardRequirement
ASTM B443Plate/sheet/strip - UNS N06625
ASTM B446Bar/rod - UNS N06625
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 625 Chemical Composition

Inconel 625 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 B443 / ASTM B446

ElementComposition (%)
Nickel (Ni)58.0% min
Chromium (Cr)20.0-23.0%
Molybdenum (Mo)8.0-10.0%
Niobium + Ta (Nb+Ta)3.15-4.15%
Iron (Fe)5.0% max
Carbon (C)0.10% max
Manganese (Mn)0.50% max
Silicon (Si)0.50% max
Aluminium (Al)0.40% max
Cobalt (Co)1.0% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 625 Alloy Composition Matters for Washers

Mo (8–10%) — Crevice Corrosion Immunity Under Bearing Faces
The high molybdenum content gives Inconel 625 washers a PREN exceeding 51, providing complete resistance to crevice corrosion in the confined geometry beneath washer bearing faces — the most vulnerable zone in any bolted assembly exposed to seawater or chloride-bearing process fluids.
Nb (3.15–4.15%) — Structural Stability Under Load
Niobium stabilises the alloy matrix and prevents sensitisation during hot stamping or machining of washers. This ensures that the corrosion resistance of the finished washer matches the original mill plate, with no degraded zones at the punched bore or OD edge.
Solid-Solution Strengthening — No Heat Treatment Required
Unlike age-hardened alloys, Inconel 625 washers achieve their full mechanical properties in the annealed condition. This eliminates distortion risk during heat treatment and simplifies dimensional control for tight-tolerance washer applications in precision flange assemblies.

Fastener Performance

Inconel 625 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Inconel 625 Washers per ASTM. Inconel 625 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 - Flat Washers (Metric)

Bolt SizeInner Dia (mm)Outer Dia (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.548
M1617.0303.095
M2021.0373.0148
M2425.0444.0210
M3031.0564.0335
M3637.0665.0490
M4243.0787.0670
M4850.0928.0880
?? Installation note: Always use Inconel 625 washers with matching Inconel 625 bolts and nuts to prevent galvanic corrosion. Apply nickel-based anti-seize to bearing faces in seawater service.

Industry Applications

Inconel 625 Washers Applications — Industries & End Uses

Inconel 625 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 625 flat washers and spring washers are standard components in ASME B16.5 and B16.47 flange bolt sets for subsea wellhead connections, BOP stacks, and Christmas tree assemblies. Their PREN 51+ rating ensures zero crevice corrosion beneath the washer bearing face in long-term seawater immersion. Compliant with NACE MR0175/ISO 15156 for H2S sour service.
Inconel 625 washers are specified for offshore platform structural bolted connections, splash-zone pipe supports, and marine heat exchanger channel cover assemblies. The combination of seawater immunity and high bearing load capacity makes them the preferred choice over super duplex or titanium washers in high-load offshore structural joints.
Flat and fender washers in Inconel 625 are used in pressure vessel nozzle flange bolt sets, reactor closure assemblies, and heat exchanger (TEMA Class B/C) channel cover connections handling phosphoric acid, hydrochloric acid, and mixed halide process streams where stainless steel 316L washers suffer rapid crevice attack.
Inconel 625 washers are used in aircraft exhaust system flange assemblies, thrust reverser attachment hardware, and nacelle structural connections where oxidation resistance to 980°C is required alongside fatigue resistance under cyclic thermal loading. Manufactured to AMS 5666 where specified.

Inconel 625 Washers Standards & International Certifications

Inconel 625 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 625 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel 625 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 625 Washers — Frequently Asked Questions

Browse expert answers to common questions about Inconel 625 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 625 washers selection and pricing.
Inconel 625 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7093 for metric sizes. Inch washers are produced per ASME B18.21.1 (lock washers) and ASME B18.22.1 (plain washers). Custom OD, ID, and thickness combinations are available for non-standard flange bolt sets with a 10-15 working day lead time. All dimensions are verified by calibrated CMM inspection.
Yes – Inconel 625 washers comply fully with NACE MR0175/ISO 15156 for sour-service applications. The alloy’s hardness in the annealed condition is well below the 35 HRC maximum specified by NACE, and the high molybdenum and niobium content provides complete resistance to sulphide stress cracking (SSC) and hydrogen-induced cracking (HIC) in H2S-bearing environments. Hardness survey certificates are available on request for Class 900-2500 sour-service flange sets.
This combination is not recommended for immersed seawater or aggressive chloride service. While Inconel 625 washers will not corrode, the stainless steel bolt shank and nut bearing faces may suffer crevice corrosion at the washer contact zone. For full corrosion protection, specify matched Inconel 625 bolt, nut, and washer sets. In atmospheric or mild environments, mixed-alloy assemblies may be acceptable – consult our engineering team for a site-specific recommendation.
Standard metric sizes (M12-M48) in DIN 125 and DIN 9021 are held ex-stock with no formal MOQ – we supply from single pieces for emergency maintenance and shutdown requirements. Custom sizes and non-standard OD/thickness combinations carry a minimum of 5 kg. Complete ASME B16.5 flange washer sets 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
  • 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