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Incoloy 825 Screws Manufacturer & Exporter in India

Explore Incoloy 825 Screws 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 Screws?

Incoloy 825 screws are high-performance nickel-iron-chromium alloy fasteners manufactured from UNS N08825 bar stock in accordance with ASTM B425. The alloy’s balanced addition of molybdenum, copper, and titanium provides exceptional resistance to both reducing and oxidizing acids, including sulfuric and phosphoric acid, as well as chloride-induced stress corrosion cracking.

Incoloy 825 screws are widely specified for critical bolted joints in chemical processing, oil & gas, and pollution control equipment where stainless steels fail due to aggressive corrosion. The alloy’s stability up to 540°C and immunity to intergranular attack after welding make it a preferred choice for demanding industrial environments.

Quick Specifications

MaterialIncoloy 825
UNS NumberN08825
DIN Number2.4858
Material StandardASTM B425
Screw Standard (Metric)DIN 912 / DIN 7991 / ISO 4762
Screw Standard (Inch)ASME B18.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM3-M48 / ?"-2"
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 full traceability 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 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 Nuts
Incoloy 825 Washers
Incoloy 825 Studs
Incoloy 825 Threaded Rods

Technical Data

Incoloy 825 Screws Dimensions, Sizes & Thread Standards

Incoloy 825 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap), DIN 7991 (countersunk), ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3. All Incoloy 825 screws dimensions are verified against applicable DIN, ISO, and ASME B18 standards

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Hex Socket (mm)Min L (mm)Max L (mm)
M30.55.53.02.5660
M40.77.04.03.0880
M50.88.55.04.010100
M61.010.06.05.012120
M81.2513.08.06.016160
M101.516.010.08.020200
M121.7518.012.010.025250
M162.024.016.014.030300
M202.530.020.017.035350
M243.036.024.019.040400
M303.545.030.022.050500
M364.054.036.027.060600
M424.563.042.032.070700
M485.072.048.036.080800

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 7991Countersunk socket screwsMetric
ISO 4762Socket head cap screwsMetric
ASME B18.3Socket cap, set, shoulder screwsUNC/UNF
ISO 14581Hexalobular socket screwsMetric
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 Screws 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%
Aluminium (Al)0.2% max
Manganese (Mn)1.0% max
Silicon (Si)0.5% max
Carbon (C)0.05% max
Sulfur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 825 Alloy Composition Matters for Screws

Cr (19.5–23.5%) — Oxidation & Acid Resistance
Chromium ensures a passive oxide film, protecting Incoloy 825 screws from oxidizing acids and high-temperature scaling in process plant environments.
Mo (2.5–3.5%) & Cu (1.5–3.0%) — Reducing Acid Protection
Molybdenum and copper provide resistance to reducing acids such as sulfuric and phosphoric acid, making Incoloy 825 screws ideal for chemical and fertilizer plants.
Ti (0.6–1.2%) — Intergranular Corrosion Immunity
Titanium stabilizes the alloy against sensitization, ensuring Incoloy 825 screws remain immune to intergranular attack after welding or high-temperature exposure.

Fastener Performance

Incoloy 825 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 825 Screws per ASTM. Incoloy 825 screws achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6977.5
M8221813
M10443621
M12776230
M1619015260
M2037029695
M24640512140
M3012801024225
?? 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 Screws Applications — Industries & End Uses

Incoloy 825 Screws 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 screws are the fastener of choice for acid reactor closures, heat exchanger channel covers, and process vessel nozzles in sulfuric, phosphoric, and nitric acid service. They provide reliable sealing and long-term corrosion resistance where stainless steel screws fail.
Socket head cap screws and set screws for downhole tools, wellhead assemblies, and sour gas processing equipment. Incoloy 825 is NACE MR0175 compliant for H2S environments and resists sulfide stress cracking.
Used in seawater-cooled heat exchangers, marine exhaust systems, and FGD scrubber internals where resistance to both chloride pitting and acidic condensates is required. Incoloy 825 screws maintain integrity in brine and acidic off-gas conditions.
Fasteners for nuclear fuel reprocessing, steam generator channel heads, and high-temperature ducting. Incoloy 825 screws are specified for their resistance to intergranular attack and stress corrosion cracking in high-purity water and aggressive chemical environments.

Incoloy 825 Screws Standards & International Certifications

Incoloy 825 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Incoloy 825 Screws — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 825 Screws 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 screws selection and pricing.
Incoloy 825 socket head screws are available to DIN 912 (metric), ISO 4762, DIN 7991 (countersunk), and ASME B18.3 (inch). Custom thread forms (UNC, UNF, BSW, BSF) and special lengths are available on request with a typical lead time of 2-3 weeks.
Nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) is recommended for Incoloy 825 screws. Apply to threads and bearing surfaces to prevent galling. Do not use copper-based anti-seize on nickel alloys due to galvanic corrosion risk.
Yes – Incoloy 825 screws 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 over stainless steel in these environments.
No formal MOQ for standard sizes (M6-M24) held ex-stock. Custom sizes or non-standard threads typically require a 10 kg minimum. Price breaks are available at 50, 200, and 500 pieces. Sample orders are accepted for project qualification.

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