+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

Incoloy 825 Washers Manufacturer & Exporter in India

Explore Incoloy 825 Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 825 Washers?

Incoloy 825 washers are high-performance nickel-iron-chromium alloy flat, spring, and lock washers manufactured from UNS N08825 bar or plate, conforming to ASTM B424. The alloy’s titanium stabilization and balanced additions of molybdenum and copper provide exceptional resistance to both reducing and oxidizing acids, including sulfuric and phosphoric acid, as well as chloride-induced pitting and crevice corrosion.

Incoloy 825 washers are widely specified for critical flange assemblies, vessel closures, and bolted joints in chemical processing, oil & gas, and marine environments where standard stainless steel washers fail due to aggressive corrosion. All washers are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 825
UNS NumberN08825
DIN Number2.4858
Material StandardASTM B424
Washer Standard (Metric)DIN 125 / DIN 127 / DIN 9021
Washer Standard (Inch)ASME B18.22.1
TypeFlat, Spring, Lock, Tab, Belleville
Size RangeM6-M100 / ¼"-4"
Tensile Strength550 MPa (80 ksi) min
Yield Strength220 MPa (32 ksi) min
HardnessMax 30 HRC / 200 HB
? All washers supplied with NABL-accredited lab certification. PMI and hardness survey available on request.

Complete the Fastener Set

Other Incoloy 825 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 825 fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 825 Bolts, Incoloy 825 Nuts, Incoloy 825 Screws, Incoloy 825 Studs, and Incoloy 825 Threaded Rods. All Incoloy 825 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 825 Bolts
Incoloy 825 Nuts
Incoloy 825 Screws
Incoloy 825 Studs
Incoloy 825 Threaded Rods

Technical Data

Incoloy 825 Washers Dimensions, Sizes & Thread Standards

Incoloy 825 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), and ASME B18.22.1. Custom OD/ID and thickness available. Metric and inch sizes supplied. All Incoloy 825 washers dimensions are verified against applicable DIN, ISO, and ASME

Flat Washer Dimensions - Metric (DIN 125)

Size (M)Inner Ø (mm)Outer Ø (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
M4849.0926.0
M5657.01058.0
M6465.01158.0
M7273.013010.0
M8081.014010.0
M100101.018012.0

Dimensional & Material Standards

StandardCoversType
DIN 125Flat washersMetric
DIN 127Spring lock washersMetric
DIN 9021Large OD washersMetric
ASME B18.22.1Plain & lock washersInch
ISO 7089Flat washersMetric
ISO 7090Chamfered washersMetric
Material StandardRequirement
ASTM B424Plate/bar - UNS N08825
ASTM F468Fastener mechanical
NACE MR0175Sour service =30 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 825 Chemical Composition

Incoloy 825 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 B424

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)0.6-1.2%
Aluminium (Al)0.2% max
Carbon (C)0.05% max
Manganese (Mn)1.0% max
Silicon (Si)0.5% max
Sulfur (S)0.03% max
? All heats spectro-tested by NABL-accredited laboratory. PMI and full traceability available.

Why Incoloy 825 Alloy Composition Matters for Washers

Cr (19.5–23.5%) — Oxidation & Acid Resistance
Chromium ensures Incoloy 825 washers resist oxidizing acids and chloride attack, making them ideal for flange assemblies in chemical plants and marine environments.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Reducing Acid Protection
Molybdenum and copper additions provide resistance to reducing acids such as sulfuric and phosphoric acid, preventing washer degradation in harsh process streams.
Ti (0.6–1.2%) — Intergranular Corrosion Resistance
Titanium stabilizes the alloy, preventing sensitization and intergranular attack at elevated temperatures, ensuring long-term washer integrity in hot service.

Fastener Performance

Incoloy 825 Washers Mechanical Properties & Hardness Reference

The table below lists mechanical properties and hardness reference for Incoloy 825 Washers per ASTM. Incoloy 825 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 Hardness (HB)Max Service Load (kN)
M12=20025
M16=20050
M20=20080
M24=200120
M30=200200
M36=200300
M42=200400
M48=200500
?? Washer hardness must be lower than mating nut/bolt to prevent galling. For dynamic loads, consult engineering support.

Industry Applications

Incoloy 825 Washers Applications — Industries & End Uses

Incoloy 825 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 825 washers are specified for flange assemblies, vessel manways, and heat exchanger closures in upstream and downstream oil & gas, especially where H2S, CO2, and chlorides are present. NACE MR0175 compliant for sour service and resistant to sulfide stress cracking.
Flat and spring washers for bolted joints in sulfuric acid, phosphoric acid, and nitric acid process equipment. Incoloy 825 washers prevent crevice corrosion and maintain preload integrity in highly corrosive chemical plant environments.
Washers for seawater intake flanges, evaporator joints, and marine heat exchangers. Incoloy 825’s resistance to pitting and crevice corrosion ensures long-term reliability in continuous seawater immersion and brine applications.
Used in flue gas desulphurisation (FGD) absorber towers, selective catalytic reduction (SCR) units, and ductwork bolting where acidic condensates and chlorides attack standard stainless steel washers.

Incoloy 825 Washers Standards & International Certifications

Incoloy 825 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 825 Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 825 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
Email Us

Answers for Buyers

Incoloy 825 Washers — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 825 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 825 washers selection and pricing.
Incoloy 825 washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), ISO 7089/7090, and ASME B18.22.1 (inch). Custom OD, ID, and thickness can be supplied to drawing. All washers are manufactured from ASTM B424 UNS N08825 plate or bar and supplied with EN 10204 3.1 certification.
Always use a suitable lubricant (such as molybdenum disulfide or nickel-based anti-seize) between the washer and mating surfaces. Ensure washer hardness is lower than the nut/bolt. Avoid over-tightening and use calibrated torque tools for critical flange assemblies.
Yes – Incoloy 825 washers are highly resistant to pitting, crevice corrosion, and stress corrosion cracking in seawater, brine, and chloride-rich environments. They are widely used in desalination plants, marine heat exchangers, and offshore platforms.
No MOQ for standard sizes (M8-M36) held in stock – single pieces can be supplied for urgent maintenance. Custom sizes or special types (e.g., Belleville, tab washers) have a 10 kg minimum. Quantity discounts apply 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