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SS 904L Studs Manufacturer & Exporter in India

Explore SS 904L Studs 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 Studs?

SS 904L studs 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, along with copper (1-2%), provides exceptional resistance to sulphuric acid, chloride pitting, and crevice corrosion.

SS 904L studs are widely specified for flange connections, pressure vessels, and process piping in chemical, petrochemical, and offshore industries where standard 316L or 317L fasteners fail due to aggressive corrosion. All studs are supplied with EN 10204 3.1 certification and full traceability.

Quick Specifications

MaterialStainless Steel 904L
UNS NumberN08904
DIN Number1.4539
Material StandardASTM A276 / ASTM A479
Stud Standard (Metric)DIN 976 / DIN 975 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength490 MPa (71 ksi) min
Yield Strength220 MPa (32 ksi) min
HardnessMax 90 HRB / 220 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 Nuts, SS 904L Screws, SS 904L Washers, 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 Nuts
SS 904L Screws
SS 904L Washers
SS 904L Threaded Rods

Technical Data

SS 904L Studs Dimensions, Sizes & Thread Standards

SS 904L Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (full thread) / DIN 975 (threaded rod) / ASME B16.5 (stud bolts for flanges). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2. All SS 904L studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.01820200
M81.252225250
M101.52630300
M121.753035400
M162.03840500
M202.54450600
M243.05460600
M303.56670800
M364.078801000
M424.5901001000
M485.01021201200
M565.51141401500
M646.01261602000
M726.01381802000
M806.01502002500
M1006.01902503000

Dimensional & Material Standards

StandardCoversThread
DIN 976Stud bolts, full threadMetric
DIN 975Threaded rodsMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
Material StandardRequirement
ASTM A276Bar/rod - UNS N08904
ASTM A479Forged bar/rod
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 904L Chemical Composition

SS 904L Studs 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 Studs

High Nickel & Molybdenum — Acid Resistance
The elevated nickel and molybdenum content in SS 904L studs provides outstanding resistance to reducing acids, especially sulphuric acid, making them ideal for chemical plant and fertilizer industry bolting.
Copper Addition — Chloride & Acid Protection
Copper enhances resistance to sulphuric and phosphoric acids and improves performance in chloride-rich environments, preventing pitting and crevice corrosion under stud nuts and washers.
Ultra-Low Carbon — No Sensitization
With a maximum carbon content of 0.02%, SS 904L studs are immune to intergranular corrosion after welding, ensuring long-term reliability in critical flange and vessel connections.

Fastener Performance

SS 904L Studs Mechanical Properties & Torque Reference

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

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12655225
M1616012850
M2032025680
M24550440115
M301100880185
M3619001520270
M4230002400370
M4844003520500
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid copper-based anti-seize in chloride-rich environments.

Industry Applications

SS 904L Studs Applications — Industries & End Uses

SS 904L Studs 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 stud bolts and nuts are specified for ASME B16.5/B16.47 flanged connections, pressure vessels, and piping in offshore platforms and refineries where resistance to H2S, chlorides, and sulphuric acid is critical. NORSOK and Shell DEP listed for splash zone and process areas.
Studs for heat exchanger channel covers, reactor closures, and acid piping flanges in phosphoric acid, sulphuric acid, and urea plants. SS 904L is the preferred choice where 316L and 317L fail due to pitting or crevice corrosion.
Stud bolts for seawater intake flanges, brine heaters, and evaporator connections in desalination plants. The high PREN and copper content prevent pitting and stress corrosion cracking in chloride-rich environments.
SS 904L studs are used in bleach plant piping, digester closures, and chemical recovery systems where resistance to mixed acid and chloride attack is required for long service life.

SS 904L Studs Standards & International Certifications

SS 904L Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367 IS 12427
Certifications
ISO 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about SS 904L Studs 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 studs selection and pricing.
SS 904L stud bolts are available to DIN 976 (metric full thread), DIN 975 (threaded rod), ASME B16.5 (flange studs), and ASME B18.31.2 (inch continuous thread). Custom thread forms (UNC, UNF, BSW, BSP) and lengths 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 8008) on SS 904L studs to prevent galling and seizing. Avoid copper-based anti-seize in chloride-rich or acidic environments to prevent galvanic corrosion. Lubricated torque values should be reduced by 20% compared to dry assembly.
Yes – SS 904L studs are specifically designed for high resistance to sulphuric acid, phosphoric acid, and chloride-rich seawater. The alloy’s high nickel, molybdenum, and copper content provides excellent pitting, crevice, and stress corrosion cracking resistance, making them ideal for chemical, fertilizer, and desalination plant bolting.
No formal MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes and non-standard threads have an MOQ of 10 kg. Flange stud bolt sets are supplied by the set with no minimum. Quantity price breaks 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