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Incoloy 925 Washers Manufacturer & Exporter in India

Explore Incoloy 925 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 Incoloy 925 Washers?

Incoloy 925 washers are high-performance nickel-iron-chromium alloy flat, spring, and lock washers manufactured from UNS N09925 bar or plate, conforming to ASTM B805. The alloy’s precipitation-hardening chemistry, with additions of molybdenum, copper, titanium, and aluminum, delivers exceptional resistance to stress corrosion cracking and pitting in aggressive chloride and sour gas environments.

Incoloy 925 washers are specified for critical bolted joints in oil & gas, marine, and chemical processing applications where both high mechanical strength and NACE MR0175 compliance are required. Their robust corrosion resistance and mechanical stability make them ideal for flange assemblies, pressure vessel closures, and subsea equipment subjected to H2S and CO2 exposure.

Quick Specifications

MaterialIncoloy 925
UNS NumberN09925
DIN Number2.4858
Material StandardASTM B805
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 6796
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Belleville
Size RangeM6-M100 / ¼"-4"
Tensile Strength650 MPa (94 ksi) min
Yield Strength380 MPa (55 ksi) min
HardnessMax 35 HRC / 300 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Incoloy 925 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 925 fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 925 Bolts, Incoloy 925 Nuts, Incoloy 925 Screws, Incoloy 925 Studs, and Incoloy 925 Threaded Rods. All Incoloy 925 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 925 Bolts
Incoloy 925 Nuts
Incoloy 925 Screws
Incoloy 925 Studs
Incoloy 925 Threaded Rods

Technical Data

Incoloy 925 Washers Dimensions, Sizes & Thread Standards

Incoloy 925 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 thickness available. Metric and inch sizes supplied to order. All Incoloy 925 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)
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
M4850.0926.0
M5658.01058.0
M6466.01158.0
M7274.013010.0
M8082.014010.0
M100102.018012.0

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/plate - UNS N09925
ASTM F468Fastener mechanical
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 925 Chemical Composition

Incoloy 925 Washers are produced from an iron-nickel-chromium alloy with controlled nickel (30–46%), chromium (19–23%), and molybdenum content per ASTM. Nickel and chromium together resist high-temperature oxidation to 1093°C in 800H grades, while molybdenum and copper additions in Incoloy 825 provide sulfuric and phosphoric acid resistance.

Chemical Composition per ASTM B805

ElementComposition (%)
Nickel (Ni)38.0-46.0
Chromium (Cr)19.5-23.5
Iron (Fe)22.0 min
Molybdenum (Mo)2.5-3.5
Copper (Cu)1.5-3.0
Titanium (Ti)1.9-2.4
Aluminum (Al)0.1-0.5
Manganese (Mn)1.0 max
Silicon (Si)0.5 max
Carbon (C)0.03 max
Sulfur (S)0.03 max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 925 Alloy Composition Matters for Washers

Cr (19.5–23.5%) — Oxidation & Pitting Resistance
High chromium content ensures Incoloy 925 washers resist pitting and crevice corrosion in chloride-rich and marine environments, making them ideal for flange and pressure vessel assemblies.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Sour Gas & Acid Protection
Molybdenum and copper additions provide resistance to H2S, CO2, and organic acids, ensuring long-term integrity in oil & gas and chemical processing applications.
Ti (1.9–2.4%) & Al (0.1–0.5%) — Precipitation Hardening
Titanium and aluminum enable age-hardening, giving Incoloy 925 washers high strength and stability under cyclic loading and elevated temperatures.

Fastener Performance

Incoloy 925 Washers Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 925 Washers per ASTM. Incoloy 925 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 Thickness (mm)
M12242.5
M16303.0
M20373.0
M24444.0
M30564.0
M36665.0
M42786.0
M48926.0
?? Assembly Note: Always use Incoloy 925 washers with matching alloy bolts/nuts for full corrosion resistance. For dynamic loads, consider Belleville or spring washers for preload retention.

Industry Applications

Incoloy 925 Washers Applications — Industries & End Uses

Incoloy 925 Washers from RealBolt are specified across petrochemical furnaces, chemical processing, nuclear, and power generation where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Incoloy 925 washers are specified for flange assemblies, BOP stacks, and subsea Christmas tree connections in sour gas (H2S) and CO2 environments. Their NACE MR0175 compliance and resistance to sulfide stress cracking make them the preferred choice for critical bolted joints in offshore and onshore oilfield equipment.
Flat and spring washers for splash-zone pipe supports, riser clamps, and marine heat exchanger assemblies where resistance to pitting, crevice corrosion, and seawater-induced stress corrosion is essential for long-term reliability.
Washer sets for pressure vessel closures, heat exchanger channel covers, and reactor manways exposed to organic acids, chlorides, and mixed halide streams. Incoloy 925 washers prevent crevice corrosion and maintain preload integrity in aggressive process environments.
Used in flue gas desulphurisation (FGD) scrubber internals, HRSG ducting, and gas turbine exhaust flange assemblies where high strength and resistance to acidic condensates are required.

Incoloy 925 Washers Standards & International Certifications

Incoloy 925 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 Incoloy 925 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 925 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

Incoloy 925 Washers — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 925 Washers from RealBolt — covering grade differences, ASTM B408/B425 standards, oxidation limits, acid resistance, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Incoloy 925 washers selection and pricing.
Incoloy 925 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 project specification. All washers are manufactured from ASTM B805 UNS N09925 material with full traceability and MTC 3.1/3.2 certification.
Yes – Incoloy 925 washers are fully compliant with NACE MR0175/ISO 15156 for sour gas service. Their high nickel, chromium, and molybdenum content provides excellent resistance to sulfide stress cracking and pitting in H2S and CO2 environments, making them ideal for oil & gas and petrochemical applications.
Incoloy 925 washers are supplied in the annealed or precipitation-hardened condition with a maximum hardness of 35 HRC (300 HB) as per ASTM F468 and NACE MR0175 requirements. Hardness testing is performed on every batch, and results are included in the mill test certificate.
Absolutely. Incoloy 925 washers offer outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in seawater and marine atmospheres. They are widely used in offshore platforms, shipbuilding, and desalination plants where long-term durability is critical.

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