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Duplex 2205 Nuts Manufacturer & Exporter in India

Explore Duplex 2205 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 Duplex 2205 Nuts?

Duplex 2205 nuts are high-strength, corrosion-resistant fasteners manufactured from duplex stainless steel UNS S32205/S31803, conforming to ASTM A479 and ASTM A182 standards. The duplex microstructure, with approximately equal ferrite and austenite phases, provides a unique combination of high yield strength (twice that of 316L) and excellent resistance to chloride pitting, crevice corrosion, and stress corrosion cracking.

Duplex 2205 nuts are widely specified for bolted joints in aggressive environments such as offshore platforms, desalination plants, chemical process equipment, and pulp & paper digesters, where standard austenitic stainless steel fasteners fail due to corrosion or mechanical overload.

Quick Specifications

MaterialDuplex 2205
UNS NumberS32205 / S31803
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 material certified by NABL-accredited laboratory. PMI and ferrite content verification available on request.

Complete the Fastener Set

Other Duplex 2205 Fastener Products Available from RealBolt

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

Technical Data

Duplex 2205 Nuts Dimensions, Sizes & Thread Standards

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

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 7040Prevailing torque nutsMetric
DIN 985Lock nutsMetric
Material StandardRequirement
ASTM A479Bar/rod - UNS S32205/S31803
ASTM A182Forged nuts
ASTM A276General bar stock
NACE MR0175Sour service =290 HB
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2205 Chemical Composition

Duplex 2205 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 / UNS S32205

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 verified by NABL-accredited spectrometry. PMI and ferrite content available on request.

Why Duplex 2205 Alloy Composition Matters for Nuts

Cr (21–23%) & Mo (2.5–3.5%) — Pitting & Crevice Resistance
High chromium and molybdenum content gives Duplex 2205 nuts a PREN of 34–36, ensuring superior resistance to pitting and crevice corrosion in chloride-rich environments such as seawater and process brines.
N (0.14–0.20%) — Strength & SCC Resistance
Nitrogen increases yield strength and enhances resistance to chloride stress corrosion cracking, making Duplex 2205 nuts reliable for high-pressure and high-temperature bolted joints.
Balanced Ferrite-Austenite Structure
The duplex microstructure provides twice the yield strength of 316L and prevents intergranular corrosion, even after welding or exposure to elevated temperatures.

Fastener Performance

Duplex 2205 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2205 Nuts per ASTM. Duplex 2205 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)
M127038
M1617063
M2034098
M24590141
M301200226
M362100324
M423300445
M484800603
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by using compatible lubricants.

Industry Applications

Duplex 2205 Nuts Applications — Industries & End Uses

Duplex 2205 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.
Duplex 2205 nuts are specified for subsea pipeline flanges, riser connections, and topside process equipment where high chloride resistance and NACE MR0175 compliance are mandatory. Used in FPSO modules, Christmas trees, and wellhead assemblies.
Hex nuts and lock nuts for high-pressure RO vessel flanges, seawater intake screens, and brine discharge manifolds. Duplex 2205 resists pitting and crevice corrosion in high-salinity environments, outperforming 316L and 904L.
Flange nut sets for heat exchangers, pressure vessels, and reactor closures in hydrochloric acid, caustic, and mixed chloride process streams. Duplex 2205 is preferred for its SCC resistance and high mechanical strength.
Nuts for digester closures, bleach plant piping, and black liquor recovery boilers. Duplex 2205 resists corrosion from sodium hydroxide, chlorides, and organic acids, extending fastener service life.

Duplex 2205 Nuts Standards & International Certifications

Duplex 2205 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 Duplex 2205 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

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

Duplex 2205 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2205 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 Duplex 2205 nuts selection and pricing.
Duplex 2205 hex nuts are available to DIN 934 (metric), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Lock nuts per DIN 985 and prevailing torque nuts per ISO 7040 are also supplied. Custom thread forms (BSW, BSF, Whitworth) and special dimensions are available on request with typical lead times of 2-3 weeks.
Molybdenum-based or PTFE anti-seize compounds (such as Molykote 1000 or Loctite LB 8014) are recommended for Duplex 2205 nuts. Apply to threads and bearing surfaces to prevent galling, especially in stainless-on-stainless assemblies. Avoid copper-based anti-seize in chloride environments to prevent galvanic corrosion.
Yes – Duplex 2205 nuts have a PREN of 34-36 and are highly resistant to pitting and crevice corrosion in seawater, brine, and other chloride-rich environments. They are widely specified for desalination, offshore, and marine structural applications where 316L and 904L are inadequate.
No formal MOQ for standard sizes (M8-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes or special thread forms typically require a 10 kg minimum. Price breaks are available at 50 pcs, 200 pcs, and 500 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