+912267437972

+919022636025

enquiry@real-bolt.com

Contact Us

Incoloy 825 Bolts Manufacturer & Exporter in India

Explore Incoloy 825 Bolts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
Request a Quote
View Products

-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 Bolts?

Incoloy 825 bolts 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 (2.5-3.5%), copper (1.5-3.0%), and titanium (0.6-1.2%), provides exceptional resistance to both reducing and oxidizing acids, as well as chloride-induced stress corrosion cracking.

Incoloy 825 bolts are widely specified for critical bolted joints in chemical processing, oil & gas, and pollution control equipment, where resistance to sulfuric and phosphoric acids, seawater, and aggressive chloride environments is essential. The alloy is fully austenitic and maintains mechanical integrity up to 540°C, making it a preferred choice for demanding industrial applications.

Quick Specifications

MaterialIncoloy 825
UNS NumberN08825
DIN Number2.4858
Material StandardASTM B425
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 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 Nuts, Incoloy 825 Screws, Incoloy 825 Washers, Incoloy 825 Studs, 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 Nuts
Incoloy 825 Screws
Incoloy 825 Washers
Incoloy 825 Studs
Incoloy 825 Threaded Rods

Technical Data

Incoloy 825 Bolts Dimensions, Sizes & Thread Standards

Incoloy 825 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 Incoloy 825 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 B425Bar/rod - UNS N08825
ASTM F467Fastener 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 Bolts 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 Bolts

Cr (19.5–23.5%) — Oxidation & Acid Resistance
Chromium ensures Incoloy 825 bolts resist oxidizing acids and aqueous corrosion, making them ideal for sulfuric and nitric acid service in chemical plants.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Reducing Acid Protection
Molybdenum and copper additions provide outstanding resistance to reducing acids, especially sulfuric and phosphoric, and protect against crevice corrosion in chloride environments.
Ti (0.6–1.2%) — Sensitization Resistance
Titanium stabilizes the alloy against intergranular attack after welding, ensuring Incoloy 825 bolts retain full corrosion resistance in the heat-affected zone.

Fastener Performance

Incoloy 825 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 825 Bolts per ASTM. Incoloy 825 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)
M12655224
M1615512458
M2031024893
M24540432135
M301080864215
M3618801504312
M4230002400430
M4844503560565
?? 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 Bolts Applications — Industries & End Uses

Incoloy 825 Bolts 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 bolts are specified for downhole tool assemblies, wellhead flange connections, and sour gas processing equipment where resistance to H2S, CO2, and chloride stress corrosion cracking is critical. NACE MR0175 compliant for sour service bolting.
Used for flange bolts and reactor closures in sulfuric acid, phosphoric acid, and nitric acid process lines, Incoloy 825 bolts provide long-term resistance to both oxidizing and reducing acids, outperforming stainless steels in mixed acid environments.
Hex bolts and stud bolts for seawater intake structures, evaporator flanges, and brine heaters in desalination plants, where resistance to pitting, crevice corrosion, and biofouling is essential for maintenance-free service.
Incoloy 825 bolts are used in flue gas desulphurization (FGD) absorber towers, stack gas reheaters, and scrubber internals, where high chloride and acidic condensate conditions rapidly corrode standard alloys.

Incoloy 825 Bolts Standards & International Certifications

Incoloy 825 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, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 931 DIN 933 ISO 4014 ISO 4017 ASME B18.2.1 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 825 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
+91 90226 36025
Email Us

Answers for Buyers

Incoloy 825 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 825 Bolts 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 bolts selection and pricing.
Incoloy 825 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) can be manufactured on request with a typical lead time of 2-3 weeks.
Nickel-based anti-seize compound (such as Molykote P-37, Jet-Lube Pure Nickel, or Bostik Never-Seez Pure Nickel) is recommended for Incoloy 825 bolts. Apply to threads and nut bearing faces. Reduce torque values by 20% for lubricated assembly. Do not use copper-based or zinc-based anti-seize on nickel alloys due to galvanic corrosion risk.
Yes – Incoloy 825 bolts are specifically designed for resistance to both sulfuric and phosphoric acids, as well as nitric acid and organic acids. The alloy’s copper and molybdenum content provides superior performance in reducing acid environments where stainless steels fail.
No MOQ for standard sizes (M12-M36) available ex-stock – single pieces can be supplied for urgent maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Flange stud bolt sets are supplied by the set with no 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