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SS 904L Nuts Manufacturer & Exporter in India

Explore SS 904L Nuts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-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 SS 904L Nuts?

SS 904L nuts are high-alloy austenitic stainless steel fasteners manufactured from UNS N08904 bar stock conforming to ASTM A276 and ASTM A479. The alloy’s elevated chromium (19-23%), nickel (23-28%), and molybdenum (4-5%) content, combined with copper (1-2%), delivers exceptional resistance to reducing acids, chloride pitting, and crevice corrosion.

SS 904L nuts are widely specified for flange joints, pressure vessels, and process equipment in aggressive chemical, petrochemical, and marine environments where standard 316L or 317L fasteners fail. All nuts are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialStainless Steel 904L
UNS NumberN08904
DIN Number1.4539
Material StandardASTM A276 / ASTM A479
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Proof Load450 MPa min
Tensile Strength490 MPa min
HardnessMax 95 HRB / 217 HB
? All material certified by NABL-accredited laboratory. PMI and IGC test available on request.

Complete the Fastener Set

Other SS 904L Fastener Products Available from RealBolt

RealBolt also manufactures the complete SS 904L fastener range from certified stainless steel bar stock, including SS 904L Bolts, SS 904L Screws, SS 904L Washers, SS 904L Studs, and SS 904L Threaded Rods. All SS 904L fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
SS 904L Bolts
SS 904L Screws
SS 904L Washers
SS 904L Studs
SS 904L Threaded Rods

Technical Data

SS 904L Nuts Dimensions, Sizes & Thread Standards

SS 904L 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 SS 904L 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
M726.010557.0
M806.011564.0
M1006.014580.0

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 A276Bar/rod - UNS N08904
ASTM A479Forged bar - UNS N08904
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 904L Chemical Composition

SS 904L Nuts are manufactured from an iron-chromium-nickel alloy with chromium (16–26%), nickel (8–28%), and grade-specific molybdenum additions per ASTM and ASTM A193/A194. Chromium content governs the self-healing passive oxide film; molybdenum (2–6%) enhances chloride pitting resistance; and carbon content determines sensitization risk in welded assemblies.

Chemical Composition per ASTM A276 / A479

ElementComposition (%)
Chromium (Cr)19.0-23.0
Nickel (Ni)23.0-28.0
Molybdenum (Mo)4.0-5.0
Copper (Cu)1.0-2.0
Carbon (C)0.02 max
Manganese (Mn)2.0 max
Silicon (Si)1.0 max
Phosphorus (P)0.045 max
Sulphur (S)0.035 max
Iron (Fe)Balance
? All heats verified by NABL-accredited spectrometry. PMI and IGC test available on request.

Why SS 904L Alloy Composition Matters for Nuts

High Nickel & Molybdenum — Acid & Chloride Resistance
The elevated nickel and molybdenum content in SS 904L nuts provides outstanding resistance to reducing acids (sulphuric, phosphoric) and chloride-induced pitting, making them ideal for harsh chemical and marine environments.
Copper Addition — Sulphuric Acid Service
Copper enhances resistance to sulphuric acid, allowing SS 904L nuts to outperform standard austenitic grades in fertilizer, chemical, and acid processing plants.
Low Carbon — No Sensitization
With a maximum carbon content of 0.02%, SS 904L nuts are immune to intergranular corrosion after welding or high-temperature exposure, ensuring long-term joint integrity.

Fastener Performance

SS 904L Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for SS 904L Nuts per ASTM. SS 904L nuts achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Nut SizeProof Load (kN)Recommended Torque (Nm)
M128.270
M1615.5170
M2024.3340
M2435.3590
M3054.61200
M3679.22000
M42110.03200
M48150.04700
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid dry assembly for large sizes.

Industry Applications

SS 904L Nuts Applications — Industries & End Uses

SS 904L Nuts from RealBolt are specified across food and dairy, pharmaceutical, marine, chemical processing, and oil and gas where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
SS 904L nuts are the preferred choice for flange joints, vessel closures, and agitator assemblies in phosphoric acid, sulphuric acid, and urea plants. Their copper and molybdenum content ensures long-term resistance to acid attack and chloride pitting, outperforming 316L and 317L fasteners in these environments.
Hex nuts and lock nuts for seawater intake structures, desalination plant piping, and marine heat exchangers. SS 904L’s high PREN and resistance to crevice corrosion make it ideal for submerged and splash-zone bolted joints.
Used in digesters, bleach towers, and chemical recovery systems where high chloride and acidic conditions exist. SS 904L nuts prevent joint failure due to pitting and stress corrosion cracking, ensuring reliable operation in aggressive process streams.
SS 904L nuts are specified for heat exchanger channel covers, pressure vessel manways, and offshore platform piping where resistance to sour gas, brine, and chloride stress corrosion is critical. Meets NORSOK and Shell DEP requirements for corrosion-resistant bolting.

SS 904L Nuts Standards & International Certifications

SS 904L 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 3.1/3.2, IS 12427 compliance, ISO 3506 material certification, NACE MR0175, and PMI (XRF) reports — available on request for all orders.
Standards
DIN 934 DIN 980 DIN 982 DIN 985 DIN 439 DIN 315 DIN 1587 DIN 6923 ISO 4032 ISO 7040 ISO 4161 ASME B18.2.2 EN ISO 4032 BS EN ISO 4032 IS 1363 IS 1364 IS 6623 IS 12427 SAE J995 UNI 5588 UNI 6593 CSN 021123 PN 82144
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

Buy SS 904L Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified SS 904L 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 904L Nuts — Frequently Asked Questions

Browse expert answers to common questions about SS 904L Nuts from RealBolt — covering ASTM A193/A194 grades, chloride resistance, temperature limits, sensitization, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on SS 904L nuts selection and pricing.
SS 904L 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, BSPP) and special dimensions 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 SS 904L nuts to prevent galling and facilitate disassembly. Avoid copper-based anti-seize in chloride-rich or marine environments to prevent galvanic corrosion. Lubricated torque values should be used for assembly.
Yes – SS 904L nuts are specifically designed for resistance to seawater, brine, and reducing acids such as sulphuric and phosphoric acid. Their high nickel, molybdenum, and copper content provides superior pitting and crevice corrosion resistance compared to 316L or 317L. They are widely used in desalination, marine, and chemical plant applications.
No formal MOQ for standard metric and inch 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