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SS 2205 (Duplex) Washers Manufacturer & Exporter in India

Explore SS 2205 (Duplex) Washers Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-50

Min Temp

300

Max Temp

🌡

300

Suitable for continuous service up to approximately 300°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

7.8

Typical density is approximately 7.8 g/cm³.

Product Overview

What are SS 2205 (Duplex) Washers?

SS 2205 (Duplex) washers are flat, spring, and locking washers manufactured from duplex stainless steel grade UNS S32205, conforming to ASTM A240 and ASTM A182 standards. This alloy features a balanced austenite-ferrite microstructure, delivering high strength (twice that of 316L) and exceptional resistance to chloride-induced pitting and crevice corrosion.

SS 2205 washers are widely specified for bolted joints in marine, chemical, and oil & gas applications where standard austenitic stainless steels fail due to stress corrosion cracking or localized attack. Their PREN of 34-36 ensures reliable performance in brine, seawater, and aggressive process environments.

Quick Specifications

MaterialDuplex Stainless Steel 2205
UNS NumberS32205
DIN Number1.4462
Material StandardASTM A240 / ASTM A182
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 Strength620 MPa (90 ksi) min
Yield Strength450 MPa (65 ksi) min
HardnessMax 290 HB
? All washers supplied with full traceability and PMI. Third-party inspection available.

Complete the Fastener Set

Other SS 2205 (Duplex) Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 2205 (Duplex) fastener range from certified duplex stainless steel bar stock, including SS 2205 (Duplex) Bolts, SS 2205 (Duplex) Nuts, SS 2205 (Duplex) Screws, SS 2205 (Duplex) Studs, and SS 2205 (Duplex) Threaded Rods. All SS 2205 (Duplex) fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
SS 2205 (Duplex) Bolts
SS 2205 (Duplex) Nuts
SS 2205 (Duplex) Screws
SS 2205 (Duplex) Studs
SS 2205 (Duplex) Threaded Rods

Technical Data

SS 2205 (Duplex) Washers Dimensions, Sizes & Thread Standards

SS 2205 (Duplex) 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 SS 2205 (Duplex) washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125)

Size (M)ID (mm)OD (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 A240Plate/sheet - UNS S32205
ASTM A182Forged bar - UNS S32205
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 2205 (Duplex) Chemical Composition

SS 2205 (Duplex) Washers are produced from a ferritic-austenitic steel with chromium (21–23%), molybdenum (3–3.5%), and nitrogen (0.14–0.20%) controlled per ASTM. Nitrogen is the critical alloying element: it simultaneously raises PREN to ≥ 35 for chloride pitting resistance and strengthens the austenite phase to achieve 450 MPa minimum yield — twice that of SS 316L.

Chemical Composition per ASTM A240 / A182

ElementComposition (%)
Chromium (Cr)21.0-23.0
Nickel (Ni)4.5-6.5
Molybdenum (Mo)2.5-3.5
Nitrogen (N)0.14-0.20
Manganese (Mn)2.0 max
Silicon (Si)1.0 max
Carbon (C)0.03 max
Phosphorus (P)0.03 max
Sulphur (S)0.02 max
Iron (Fe)Balance
? All heats spectro-tested and certified. PMI and third-party inspection available.

Why SS 2205 (Duplex) Alloy Composition Matters for Washers

Cr (21–23%) & Mo (2.5–3.5%) — Pitting & Crevice Resistance
High chromium and molybdenum content gives SS 2205 washers a PREN of 34–36, ensuring superior resistance to pitting and crevice corrosion in chloride-rich environments, such as seawater and chemical process streams.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen addition increases yield strength and enhances resistance to stress corrosion cracking, making SS 2205 washers ideal for bolted joints exposed to cyclic loading and aggressive media.
Balanced Duplex Structure
The dual-phase (austenite-ferrite) microstructure provides twice the strength of 316L and excellent toughness, even at low temperatures, with no risk of intergranular corrosion after welding.

Fastener Performance

SS 2205 (Duplex) Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for SS 2205 (Duplex) Washers per ASTM. SS 2205 (Duplex) washers achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer SizeRecommended Bolt SizeMax Load (kN)
M12M1245
M16M1680
M20M20125
M24M24180
M30M30290
M36M36410
M42M42570
M48M48750
?? Installation: Always use SS 2205 washers with matching duplex bolts/nuts for optimal corrosion resistance. Avoid mixing with carbon steel hardware.

Industry Applications

SS 2205 (Duplex) Washers Applications — Industries & End Uses

SS 2205 (Duplex) Washers from RealBolt are specified across offshore platforms, desalination, pulp and paper, and chemical processing where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
SS 2205 (Duplex) washers are specified for flange joints, riser clamps, and subsea equipment in offshore oil & gas platforms, where resistance to chloride pitting and crevice corrosion is critical. NORSOK and Shell DEP compliant for splash zone and immersion service.
Flat and spring washers for hull penetrations, deck equipment, and seawater piping systems. SS 2205 washers prevent crevice corrosion under bolt heads and nuts in marine atmospheres and submerged conditions.
Used in bolted joints for heat exchangers, pressure vessels, and process piping in desalination, fertilizer, and chemical plants where high chloride and acidic environments challenge standard stainless steels.
Washers for digesters, bleach towers, and chemical recovery systems, where resistance to sulphide stress corrosion and high mechanical strength are required.

SS 2205 (Duplex) Washers Standards & International Certifications

SS 2205 (Duplex) 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 3.2 (third-party), NACE MR0175/ISO 15156, NORSOK M-630, Charpy impact certificates, and PMI (XRF) 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 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy SS 2205 (Duplex) Washers from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 2205 (Duplex) 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

SS 2205 (Duplex) Washers — Frequently Asked Questions

Browse expert answers to common questions about SS 2205 (Duplex) Washers from RealBolt — covering PREN ≥ 35, NACE MR0175, ASTM A182 F60, sigma-phase limits, sizes, and EN 10204 3.1/3.2 documentation. Contact our technical team directly for project-specific guidance on SS 2205 (Duplex) washers selection and pricing.
SS 2205 (Duplex) washers are available to DIN 125 (flat), DIN 127 (spring), DIN 9021 (large OD), ISO 7089/7090, and ASME B18.22.1 (inch). Custom dimensions and special types (tab, Belleville, serrated) can be supplied to drawing or international standards.
It is not recommended to use SS 2205 washers with carbon steel bolts due to the risk of galvanic corrosion. For optimal performance, always pair duplex washers with duplex or austenitic stainless steel bolts and nuts.
Yes – SS 2205 washers are specifically designed for seawater and brine service, offering excellent resistance to pitting, crevice, and stress corrosion cracking. They are widely used in offshore, marine, and desalination applications.
Standard sizes (M6-M36) are available ex-stock with no MOQ – single pieces can be supplied for urgent needs. Custom sizes or special types may require a 10 kg minimum order. Price breaks 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