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Incoloy 825 Studs Manufacturer & Exporter in India

Explore Incoloy 825 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 Incoloy 825 Studs?

Incoloy 825 studs are high-performance nickel-iron-chromium alloy fasteners manufactured from UNS N08825 bar stock in accordance with ASTM B425. The alloy’s balanced composition, including significant additions of molybdenum, copper, and titanium, provides exceptional resistance to both reducing and oxidizing acids, stress corrosion cracking, and pitting in chloride-rich environments.

Incoloy 825 studs are widely specified for critical flange connections, pressure vessel closures, and heat exchanger assemblies in chemical processing, oil & gas, and marine industries. Their stability against intergranular attack and resistance to sulphuric and phosphoric acids make them a preferred choice for aggressive service conditions where stainless steels fail.

Quick Specifications

MaterialIncoloy 825
UNS NumberN08825
DIN Number2.4858
Material StandardASTM B425
Stud Standard (Metric)DIN 976 / DIN 975 / ISO 898-1
Stud Standard (Inch)ASME B16.5 / ASME B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength585 MPa (85 ksi) min
Yield Strength220 MPa (32 ksi) min
HardnessMax 30 HRC / 200 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Incoloy 825 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 825 fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 825 Bolts, Incoloy 825 Nuts, Incoloy 825 Screws, Incoloy 825 Washers, and Incoloy 825 Threaded Rods. All Incoloy 825 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 825 Bolts
Incoloy 825 Nuts
Incoloy 825 Screws
Incoloy 825 Washers
Incoloy 825 Threaded Rods

Technical Data

Incoloy 825 Studs Dimensions, Sizes & Thread Standards

Incoloy 825 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 Incoloy 825 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
M424.590901000
M485.01021001200
M565.51141201500
M646.01261402000
M726.01381602000
M806.01501802500
M1006.01802003000

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 B425Bar/rod - UNS N08825
ASTM F468Fastener mechanical
NACE MR0175Sour service =30 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 825 Chemical Composition

Incoloy 825 Studs are produced from an iron-nickel-chromium alloy with controlled nickel (30–46%), chromium (19–23%), and molybdenum content per ASTM. Nickel and chromium together resist high-temperature oxidation to 1093°C in 800H grades, while molybdenum and copper additions in Incoloy 825 provide sulfuric and phosphoric acid resistance.

Chemical Composition per ASTM B425

ElementComposition (%)
Nickel (Ni)38.0-46.0%
Chromium (Cr)19.5-23.5%
Iron (Fe)22.0% min
Molybdenum (Mo)2.5-3.5%
Copper (Cu)1.5-3.0%
Titanium (Ti)0.6-1.2%
Manganese (Mn)1.0% max
Silicon (Si)0.5% max
Carbon (C)0.05% max
Aluminium (Al)0.2% max
Sulphur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 825 Alloy Composition Matters for Studs

Cr (19.5–23.5%) — Oxidation & Acid Resistance
Chromium ensures Incoloy 825 studs resist oxidizing acids and chloride-induced pitting, making them ideal for harsh chemical and marine environments.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Reducing Acid Protection
Molybdenum and copper additions provide outstanding resistance to reducing acids such as sulphuric and phosphoric, preventing stud failure in process plant applications.
Ti (0.6–1.2%) — Intergranular Corrosion Stability
Titanium stabilizes the alloy against sensitization, ensuring Incoloy 825 studs maintain corrosion resistance after welding or high-temperature exposure.

Fastener Performance

Incoloy 825 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 825 Studs per ASTM. Incoloy 825 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)
M12655222
M1614011244
M2028022469
M2448038499
M30950760158
M3617001360228
M4227002160312
M4840003200410
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys.

Industry Applications

Incoloy 825 Studs Applications — Industries & End Uses

Incoloy 825 Studs from RealBolt are specified across petrochemical furnaces, chemical processing, nuclear, and power generation where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Incoloy 825 studs are the preferred choice for ASME B16.5/B16.47 flange connections, pressure vessel closures, and heat exchanger channel covers in upstream and downstream oil & gas. Fully compliant with NACE MR0175 for H2S sour service and resistant to chloride-induced stress corrosion cracking.
Stud bolts for sulphuric acid, phosphoric acid, and nitric acid plant piping, reactors, and vessel nozzles. Incoloy 825’s unique resistance to both oxidizing and reducing acids ensures long service life in aggressive chemical environments.
Studs for seawater-cooled heat exchangers, marine exhaust systems, and splash zone structural connections. Incoloy 825’s high nickel and chromium content prevents pitting and crevice corrosion in saltwater immersion.
Stud bolt sets for flue gas desulphurisation (FGD) scrubbers, selective catalytic reduction (SCR) units, and HRSG ductwork where resistance to acidic condensates and high temperatures is critical.

Incoloy 825 Studs Standards & International Certifications

Incoloy 825 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, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Incoloy 825 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 825 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
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Answers for Buyers

Incoloy 825 Studs — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 825 Studs from RealBolt — covering grade differences, ASTM B408/B425 standards, oxidation limits, acid resistance, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Incoloy 825 studs selection and pricing.
Incoloy 825 studs are available to DIN 976 (full thread), DIN 975 (threaded rod), ASME B16.5 (flange stud bolts), and ASME B18.31.2 (continuous thread). Custom thread forms (BSW, BSF, Whitworth, BSPP) can be supplied on request with a typical lead time of 2-3 weeks.
Use nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and nut faces. Reduce torque values by 20% for lubricated assembly. Never use copper-based or zinc-based anti-seize on nickel alloys to avoid galvanic corrosion.
Yes – Incoloy 825 offers outstanding resistance to both sulphuric acid and seawater, making it ideal for chemical plant and marine applications. Its alloy balance prevents pitting, crevice corrosion, and stress corrosion cracking in aggressive environments.
No formal MOQ for standard sizes (M12-M36) held ex-stock – single pieces can be supplied for urgent maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Price breaks at 50, 200, and 500 pieces.

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