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SS 904L Bolts Manufacturer & Exporter in India

Explore SS 904L Bolts 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 Bolts?

SS 904L bolts 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 bolts are widely specified for flange connections, pressure vessels, and process equipment in aggressive chemical, petrochemical, and marine environments where standard 316L or duplex stainless steels are inadequate. All fasteners 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
Bolt Standard (Metric)DIN 931 / DIN 933 / ISO 4014
Bolt Standard (Inch)ASME B18.2.1
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 / 210 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 Nuts, 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 Nuts
SS 904L Screws
SS 904L Washers
SS 904L Studs
SS 904L Threaded Rods

Technical Data

SS 904L Bolts Dimensions, Sizes & Thread Standards

SS 904L Bolts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 931 (partial thread) / DIN 933 (full thread) / ISO 4014. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.2.1. All SS 904L bolts dimensions are verified against applicable DIN, ISO, and ASME

Hex Bolt Dimensions - Metric (DIN 931 / ISO 4014)

Size (M)Pitch (mm)A/F (mm)Head Ht (mm)Min L (mm)Max L (mm)
M61.0104.010200
M81.25135.312250
M101.5176.416300
M121.75197.520400
M162.02410.025500
M202.53012.530600
M243.03615.040600
M303.54618.750800
M364.05522.5601000
M424.56526.0801000
M485.07530.01001200
M565.58535.01201500
M646.09540.01402000
M726.010545.01602000
M806.011550.01802500
M1006.014563.02003000

Dimensional & Material Standards

StandardCoversThread
DIN 931Hex bolts, partial threadMetric
DIN 933Hex bolts, full threadMetric
ISO 4014Hex head screws, partialMetric
ISO 4017Hex head screws, fullMetric
ASME B18.2.1Hex & heavy hex boltsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
Material StandardRequirement
ASTM A276Bar/rod - UNS N08904
ASTM A479Forged bar/rod - UNS N08904
ASTM F594Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

SS 904L Chemical Composition

SS 904L Bolts 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 Bolts

High Mo (4–5%) — Pitting & Crevice Resistance
Molybdenum content in SS 904L provides superior resistance to pitting and crevice corrosion in chloride-rich and acidic environments, outperforming 316L and duplex grades in seawater and process plant service.
Copper (1–2%) — Acid Resistance
Copper enhances resistance to sulphuric, phosphoric, and acetic acids, making SS 904L bolts ideal for chemical process equipment and acid-handling piping systems.
Low Carbon — No Sensitisation
With a maximum carbon content of 0.02%, SS 904L bolts are immune to intergranular corrosion after welding, ensuring long-term reliability in critical flange and vessel connections.

Fastener Performance

SS 904L Bolts Mechanical Properties & Torque Reference

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

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12655222
M1616012845
M2032025671
M24550440104
M301100880165
M3619001520240
M4230002400340
M4844003520470
?? Anti-galling: Use molybdenum-based or PTFE anti-seize. Lubricated values assume K=0.16. Avoid stainless-on-stainless galling by using dissimilar nut grades or coatings.

Industry Applications

SS 904L Bolts Applications — Industries & End Uses

SS 904L Bolts 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, FPSOs, and refineries handling sour crude, brine, and H2S-rich environments. NACE MR0103 and MR0175 compliant.
Hex bolts and fasteners for seawater-cooled heat exchangers, desalination plants, and shipboard piping systems where resistance to pitting, crevice, and stress corrosion cracking is critical. Outperforms 316L in long-term immersion.
Flange bolts and stud sets for phosphoric acid, sulphuric acid, and urea reactors, fertilizer plant piping, and acid storage tanks. SS 904L’s copper addition ensures superior resistance to reducing acids and chloride attack.
SS 904L bolts are used in bleach plant washers, digesters, and chemical recovery systems where high chloride and acidic conditions rapidly corrode standard stainless steel fasteners.

SS 904L Bolts Standards & International Certifications

SS 904L Bolts 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 931 DIN 933 DIN 960 DIN 961 ISO 4014 ISO 4017 ISO 8676 ISO 8765 ASME B18.2.1 EN ISO 4014 EN ISO 4017 BS EN ISO 4014 BS EN ISO 4017 IS 1363 IS 1364 IS 12427 SAE J429 UNI 5737 UNI 5739 CSN 021101 CSN 021103 PN 82101 PN 82105
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified SS 904L Bolts — 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
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Answers for Buyers

SS 904L Bolts — Frequently Asked Questions

Browse expert answers to common questions about SS 904L Bolts 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 bolts selection and pricing.
SS 904L hex bolts are available to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 (inch hex and heavy hex). Stud bolts are supplied per ASME B16.5 or MSS SP-75 for flange applications. Custom thread forms (BSW, BSF, Whitworth, BSPP) and special coatings are available on request.
Molybdenum-based or PTFE anti-seize is recommended for SS 904L bolts to prevent galling and seizing, especially in stainless-on-stainless assemblies. Apply to threads and nut bearing face. Avoid copper-based anti-seize in chloride-rich or marine environments to prevent galvanic corrosion.
Yes – SS 904L bolts offer excellent resistance to pitting, crevice, and stress corrosion cracking in seawater, brine, and acidic process streams. The alloy’s high Mo and Cu content makes it ideal for marine, desalination, and chemical plant service where 316L fails.
No MOQ for standard sizes (M12-M36) held ex-stock – we supply from single pieces for urgent maintenance. Custom sizes or special coatings 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