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SS 2205 (Duplex) Nuts Manufacturer & Exporter in India

Explore SS 2205 (Duplex) Nuts 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) Nuts?

SS 2205 (Duplex) nuts are high-strength, corrosion-resistant fasteners manufactured from duplex stainless steel grade UNS S32205, conforming to ASTM A479 and ASTM A182 standards. The duplex microstructure, with approximately equal proportions of austenite and ferrite, provides a unique combination of mechanical strength (twice that of 316L) and superior resistance to chloride-induced pitting, crevice, and stress corrosion cracking.

SS 2205 nuts are widely specified for bolted joints in aggressive environments such as seawater, brine, and chemical process streams, where conventional austenitic stainless steels are prone to failure. They are the industry standard for offshore platforms, desalination plants, and chemical reactors requiring reliable, long-life bolted connections.

Quick Specifications

MaterialDuplex Stainless Steel 2205
UNS NumberS32205
DIN Number1.4462
Material StandardASTM A479 / ASTM A182
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size RangeM6-M64 / ¼"-2½"
Tensile Strength620 MPa (90 ksi) min
Yield Strength450 MPa (65 ksi) min
HardnessMax 290 HB
? All nuts 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) Screws, SS 2205 (Duplex) Washers, 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) Screws
SS 2205 (Duplex) Washers
SS 2205 (Duplex) Studs
SS 2205 (Duplex) Threaded Rods

Technical Data

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

SS 2205 (Duplex) Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread forms and heavy hex per ASME B18.2.2. Inch and metric sizes available. All SS 2205 (Duplex) nuts dimensions are verified against applicable DIN, ISO, and ASME

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Height (mm)
M61.0105.0
M81.25136.5
M101.5178.0
M121.751910.0
M162.02413.0
M202.53016.0
M243.03619.0
M303.54624.0
M364.05529.0
M424.56534.0
M485.07538.0
M565.58545.0
M646.09551.0

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nutsMetric
ISO 4032Hex nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ISO 4033Heavy hex nutsMetric
BS 1768Hex nutsBSW/BSF
Material StandardRequirement
ASTM A479Bar/rod - UNS S32205
ASTM A182Forged nuts
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC
NACE MR0175Sour service

Material Chemistry

SS 2205 (Duplex) Chemical Composition

SS 2205 (Duplex) Nuts 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 A479

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 full traceability available.

Why SS 2205 (Duplex) Alloy Composition Matters for Nuts

Cr (21–23%) — Pitting & Crevice Resistance
High chromium content ensures a PREN >34, giving SS 2205 nuts excellent resistance to pitting and crevice corrosion in seawater and chloride-rich environments, outperforming 316L.
Mo (2.5–3.5%) — Enhanced Chloride Resistance
Molybdenum further boosts resistance to localised corrosion, making these nuts ideal for marine, desalination, and chemical plant applications.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen increases yield strength and improves resistance to stress corrosion cracking, a key failure mode for nuts in hot, salty, or acidic service.

Fastener Performance

SS 2205 (Duplex) Nuts Mechanical Properties & Torque Reference

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

Nut SizeRecommended Torque (Nm)Clamp Load (kN)
M127032
M1617065
M20340105
M24590150
M301200245
M362100355
M423200480
M484700620
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid dry assembly for large nuts to prevent thread galling.

Industry Applications

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

SS 2205 (Duplex) Nuts 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 nuts are the default choice for subsea pipeline flanges, riser connections, and topside process equipment on offshore platforms. Their high strength and resistance to chloride SCC make them ideal for splash zone and submerged service.
Hex nuts and heavy hex nuts for high-pressure RO vessel flanges, seawater intake screens, and brine discharge piping. SS 2205’s PREN >34 ensures long-term resistance to pitting and crevice corrosion in saline environments.
Used for reactor closures, heat exchanger channel covers, and process piping flanges in environments containing chlorides, organic acids, and caustics where 316L nuts would fail prematurely.
SS 2205 nuts are specified for digester vessel flanges, bleach plant piping, and black liquor recovery systems, where resistance to chloride and caustic attack is critical for fastener longevity.

SS 2205 (Duplex) Nuts Standards & International Certifications

SS 2205 (Duplex) Nuts 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 934 ISO 4032 ASME B18.2.2 EN ISO 4032 IS 1364 IS 1367 IS 12427
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

SS 2205 (Duplex) Nuts — Frequently Asked Questions

Browse expert answers to common questions about SS 2205 (Duplex) Nuts 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) nuts selection and pricing.
SS 2205 (Duplex) hex nuts are available to DIN 934 (metric), ISO 4032, ISO 4033 (heavy hex), and ASME B18.2.2 (inch hex and heavy hex). Custom thread forms such as UNC, UNF, BSW, and BSF can be supplied on request. All nuts are manufactured from ASTM A479/A182 bar or forgings and supplied with full certification.
Molybdenum-based or PTFE anti-seize is recommended for SS 2205 nuts to prevent galling and thread seizure, especially in large sizes or high-torque applications. Avoid copper-based anti-seize in chloride environments. Always apply lubricant to both nut and bolt threads for consistent preload.
Yes – SS 2205 (Duplex) nuts have a PREN >34 and are highly resistant to pitting, crevice, and stress corrosion cracking in seawater and brine. They are widely used for offshore, marine, and desalination plant bolted joints, outperforming 316L in aggressive chloride environments.
No MOQ for standard sizes (M8-M36) available ex-stock. For custom sizes or non-standard threads, MOQ is typically 10 kg or 50 pieces. Bulk price breaks are available at 100, 250, and 500 pieces. Sample orders for project qualification are accepted.

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