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Incoloy 825 Nuts Manufacturer & Exporter in India

Explore Incoloy 825 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 Incoloy 825 Nuts?

Incoloy 825 nuts 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 nuts are widely specified for use in sulfuric and phosphoric acid process equipment, offshore oil & gas piping, and pollution control systems. They are fully compliant with NACE MR0175/ISO 15156 for sour service and are preferred for bolted joints exposed to aggressive chemical environments where stainless steels fail.

Quick Specifications

MaterialIncoloy 825
UNS NumberN08825
DIN Number2.4858
Material StandardASTM B425
Nut Standard (Metric)DIN 934 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size RangeM6-M100 / ¼"-4"
Tensile Strength550 MPa (80 ksi) min
Yield Strength220 MPa (32 ksi) min
HardnessMax 30 HRC / 200 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey 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 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 Bolts
Incoloy 825 Screws
Incoloy 825 Washers
Incoloy 825 Studs
Incoloy 825 Threaded Rods

Technical Data

Incoloy 825 Nuts Dimensions, Sizes & Thread Standards

Incoloy 825 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032. Custom thread pitches and heavy hex patterns available. Inch dimensions per ASME B18.2.2. All Incoloy 825 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before

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
M726.010558.0
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 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 Nuts 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
Sulfur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 825 Alloy Composition Matters for Nuts

Cr (19.5–23.5%) — Oxidation & Acid Resistance
Chromium ensures a stable passive film, protecting Incoloy 825 nuts from oxidizing acids and high-temperature oxidation, making them ideal for acid leach reactors and scrubber assemblies.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Reducing Acid Protection
Molybdenum and copper provide outstanding resistance to reducing acids such as sulfuric and phosphoric acid, preventing nut thread attack and galling in chemical process equipment.
Ti (0.6–1.2%) — Intergranular Corrosion Resistance
Titanium stabilizes the alloy against sensitization, ensuring Incoloy 825 nuts maintain their corrosion resistance after welding or exposure to elevated temperatures.

Fastener Performance

Incoloy 825 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 825 Nuts per ASTM. Incoloy 825 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 SizeRecommended Torque (Nm)Clamp Load (kN)
M126528
M1616056
M2032090
M24540130
M301100210
M361900300
M423000420
M484400570
?? Anti-galling: Always use nickel-based anti-seize (Molykote P-37 or equivalent) on Incoloy 825 nuts. Lubricated values assume K=0.15. Avoid copper-based anti-seize to prevent galvanic corrosion.

Industry Applications

Incoloy 825 Nuts Applications — Industries & End Uses

Incoloy 825 Nuts 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 nuts are specified for bolted joints in offshore platforms, subsea pipelines, and wellhead equipment exposed to H2S and chloride-rich environments. Fully compliant with NACE MR0175/ISO 15156 for sour service and resistant to sulfide stress cracking.
Used for flange connections, reactor closures, and agitator assemblies in sulfuric acid, phosphoric acid, and nitric acid plants. Incoloy 825 nuts provide superior resistance to both oxidizing and reducing acids, outperforming stainless steel in aggressive process streams.
Hex nuts and lock nuts for evaporator vessels, heat exchangers, and scrubber systems in desalination plants and flue gas desulfurization (FGD) units, where resistance to chloride pitting and acid condensates is critical.
Incoloy 825 nuts are used in nuclear waste reprocessing, spent fuel handling, and steam generator hardware due to their resistance to intergranular attack and stress corrosion cracking in high-temperature, corrosive environments.

Incoloy 825 Nuts Standards & International Certifications

Incoloy 825 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, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 934 ISO 4032 ASME B18.2.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Incoloy 825 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 825 Nuts 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 nuts selection and pricing.
Incoloy 825 hex nuts are available to DIN 934 (metric), ISO 4032, and ASME B18.2.2 (inch hex and heavy hex). Lock nuts and prevailing torque nuts are supplied to DIN 985 and ISO 7040. Custom thread forms (BSW, BSF, Whitworth) are available 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 all Incoloy 825 nut threads and bearing surfaces. This prevents galling and ensures consistent preload. Do not use copper-based anti-seize to avoid galvanic corrosion with nickel alloys.
Yes – Incoloy 825 nuts are specifically designed for resistance to both sulfuric and phosphoric acids, as well as nitric acid and organic acids. Their Mo and Cu content provides superior performance in reducing acid environments where stainless steel nuts fail.
No MOQ for standard sizes (M8-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes or special thread forms have an MOQ of 10 kg. 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