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Duplex 2304 Nuts Manufacturer & Exporter in India

Explore Duplex 2304 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 2304 Nuts?

Duplex 2304 nuts are corrosion-resistant fasteners manufactured from UNS S32304 duplex stainless steel, conforming to ASTM A182 and ASTM A479 standards. This alloy features a balanced dual-phase microstructure of austenite and ferrite, delivering a minimum yield strength of 450 MPa-nearly double that of standard 304/316 stainless steel nuts.

With a PREN of 26-28, Duplex 2304 nuts provide excellent resistance to pitting and crevice corrosion in chloride-rich environments, making them a cost-effective alternative to 316L and 2205 for many industrial applications. They are widely specified for use in water treatment, chemical processing, and structural bolting where moderate corrosion and high mechanical strength are required.

Quick Specifications

MaterialDuplex 2304
UNS NumberS32304
DIN Number1.4362
Material StandardASTM A182 / ASTM A479
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 Strength600 MPa (87 ksi) min
Yield Strength450 MPa (65 ksi) min
HardnessMax 25 HRC / 255 HB
? All material certified by NABL-accredited laboratory. PMI and ferrite content verification available on request.

Complete the Fastener Set

Other Duplex 2304 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Duplex 2304 fastener range from certified duplex stainless steel bar stock, including Duplex 2304 Bolts, Duplex 2304 Screws, Duplex 2304 Washers, Duplex 2304 Studs, and Duplex 2304 Threaded Rods. All Duplex 2304 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Duplex 2304 Bolts
Duplex 2304 Screws
Duplex 2304 Washers
Duplex 2304 Studs
Duplex 2304 Threaded Rods

Technical Data

Duplex 2304 Nuts Dimensions, Sizes & Thread Standards

Duplex 2304 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 2304 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 A182Forged nuts - UNS S32304
ASTM A479Bar/rod - UNS S32304
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Duplex 2304 Chemical Composition

Duplex 2304 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 A182 / A479

ElementComposition (%)
Chromium (Cr)21.5-24.5
Nickel (Ni)3.0-5.5
Molybdenum (Mo)0.05-0.6
Nitrogen (N)0.05-0.2
Manganese (Mn)2.5 max
Silicon (Si)1.0 max
Carbon (C)0.03 max
Phosphorus (P)0.04 max
Sulfur (S)0.015 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and ferrite content verification available on request.

Why Duplex 2304 Alloy Composition Matters for Nuts

Cr (21.5–24.5%) — Corrosion Resistance
High chromium content ensures Duplex 2304 nuts resist pitting and crevice corrosion in chloride-bearing environments, outperforming 304/316 in many water and process applications.
N (0.05–0.2%) — Strength & Toughness
Nitrogen addition increases yield strength and improves resistance to stress corrosion cracking, making Duplex 2304 nuts suitable for high-load and cyclic applications.
Low Mo — Cost Efficiency
With only trace molybdenum, Duplex 2304 offers a balance of corrosion resistance and cost, making it ideal for large-scale projects where 2205 or super duplex may be excessive.

Fastener Performance

Duplex 2304 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Duplex 2304 Nuts per ASTM. Duplex 2304 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)Proof Load (kN)
M127052
M1617085
M20340135
M24590195
M301200315
M362100460
M423300650
M484800850
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.14. Avoid over-tightening to prevent thread galling in duplex stainless nuts.

Industry Applications

Duplex 2304 Nuts Applications — Industries & End Uses

Duplex 2304 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 2304 nuts are widely used in water treatment plants, desalination units, and municipal waterworks for flange connections, valve assemblies, and structural bolting. Their high resistance to chloride-induced corrosion and cost-effectiveness make them ideal for brackish and potable water systems.
Hex nuts and lock nuts in Duplex 2304 are specified for digesters, bleach towers, and chemical storage tanks where resistance to weak acids, chlorides, and high mechanical strength are required for reliable bolted joints.
Duplex 2304 nuts are used in process piping, heat exchangers, and pressure vessel closures in chemical plants handling organic acids, caustics, and moderate chloride concentrations, offering a balance of corrosion resistance and strength.
Duplex 2304 nuts are chosen for bridges, coastal structures, and architectural facades where atmospheric corrosion and high load-bearing capacity are needed, outperforming 304/316 in many exposed environments.

Duplex 2304 Nuts Standards & International Certifications

Duplex 2304 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 2304 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Duplex 2304 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 2304 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Duplex 2304 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 2304 nuts selection and pricing.
Duplex 2304 hex nuts are available to DIN 934 (metric), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Lock nuts and prevailing torque nuts are supplied per DIN 985 and ISO 7040. Custom thread forms (BSW, BSF, Whitworth) and special coatings are available on request with a typical lead time of 2-3 weeks.
Use molybdenum-based or PTFE anti-seize compound (such as Molykote 1000 or Loctite LB 8014) on threads and nut faces to prevent galling. Avoid copper-based anti-seize in chloride environments. Lubricated torque values should be reduced by 15% compared to dry assembly.
Yes – Duplex 2304 nuts offer excellent resistance to pitting and crevice corrosion in brackish and potable water, and are suitable for seawater splash zones and immersed service where 316L is insufficient. For continuous immersion in high-chloride seawater, consider 2205 or super duplex for maximum durability.
No MOQ for standard sizes (M8-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or special coatings may require a 10 kg minimum. Quantity 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