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Incoloy 800 Bolts Manufacturer & Exporter in India

Explore Incoloy 800 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 Incoloy 800 Bolts?

Incoloy 800 bolts are high-temperature nickel-iron-chromium alloy fasteners produced from UNS N08800 bar stock in accordance with ASTM B408. The alloy’s balanced composition of nickel (30-35%), chromium (19-23%), and iron (39.5% min) delivers excellent resistance to oxidation, carburization, and chloride stress corrosion cracking at elevated temperatures up to 800°C.

Incoloy 800 bolts are widely specified for bolted joints in heat exchangers, process piping, and furnace equipment where standard stainless steels fail due to thermal embrittlement or scaling. They are the industry standard for petrochemical, power generation, and refinery applications requiring long-term structural stability and corrosion resistance in aggressive, high-temperature environments.

Quick Specifications

MaterialIncoloy 800
UNS NumberN08800
DIN Number1.4876
Material StandardASTM B408
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 Strength520 MPa (75 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 85 HRB / 180 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Incoloy 800 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 800 fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 800 Nuts, Incoloy 800 Screws, Incoloy 800 Washers, Incoloy 800 Studs, and Incoloy 800 Threaded Rods. All Incoloy 800 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 800 Nuts
Incoloy 800 Screws
Incoloy 800 Washers
Incoloy 800 Studs
Incoloy 800 Threaded Rods

Technical Data

Incoloy 800 Bolts Dimensions, Sizes & Thread Standards

Incoloy 800 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 800 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 B408Bar/rod - UNS N08800
ASTM F468Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800 Chemical Composition

Incoloy 800 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 B408

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.10 max
Aluminium (Al)0.15-0.60
Titanium (Ti)0.15-0.60
Manganese (Mn)1.5 max
Silicon (Si)1.0 max
Copper (Cu)0.75 max
Sulfur (S)0.015 max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 800 Alloy Composition Matters for Bolts

High Nickel (30–35%) — Chloride SCC Resistance
Nickel content ensures Incoloy 800 bolts resist chloride stress corrosion cracking and maintain ductility at high temperatures, making them ideal for heat exchanger and process piping bolting.
Chromium (19–23%) — Oxidation & Scaling Resistance
Chromium provides a stable oxide layer, protecting bolts from scaling and oxidation in furnace and reformer atmospheres up to 800°C.
Al + Ti Stabilization — Prevents Sensitization
Aluminium and titanium additions stabilize the alloy against intergranular attack, ensuring long-term bolt integrity after repeated thermal cycling.

Fastener Performance

Incoloy 800 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800 Bolts per ASTM. Incoloy 800 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)
M12604822
M1614011253
M2028022485
M24480384123
M30950760196
M3616501320285
M4226502120393
M4839003120530
?? 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 800 Bolts Applications — Industries & End Uses

Incoloy 800 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 800 bolts are the preferred choice for bolting in ethylene cracking furnaces, reformer tube sheets, and process heater flanges due to their resistance to carburization, oxidation, and chloride SCC at high temperatures. ASTM B408 compliance ensures long-term reliability in cyclic thermal environments.
Used for superheater header bolting, HRSG duct connections, and steam generator manways where resistance to scaling and embrittlement at 700-800°C is critical. Incoloy 800 bolts maintain mechanical integrity after repeated thermal cycling.
Flange bolts and stud sets for nitric acid, urea, and ammonium nitrate plant piping and reactors. Incoloy 800’s stability against intergranular attack and stress corrosion cracking ensures safe, leak-free operation in aggressive chemical environments.
Specified for channel cover bolts, tube sheet fasteners, and closure hardware in shell-and-tube heat exchangers and pressure vessels operating at elevated temperatures and in corrosive atmospheres.

Incoloy 800 Bolts Standards & International Certifications

Incoloy 800 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 9001:2015PED 2014/68/EUNABL LabMTC 3.1 / 3.2

Buy Incoloy 800 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800 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
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Answers for Buyers

Incoloy 800 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800 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 800 bolts selection and pricing.
Incoloy 800 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 for flanges are supplied per ASME B16.5 and MSS SP-75. Custom thread forms (BSW, BSF, Whitworth, BSPP) can be manufactured on request with a typical lead time of 2-3 weeks.
Use nickel-based anti-seize compound (such as Molykote P-37, Jet-Lube Pure Nickel, or Bostik Never-Seez Pure Nickel) on all Incoloy 800 bolt threads and nut faces. Reduce torque values by 20% for lubricated assembly. Do not use copper-based or zinc-based anti-seize on nickel alloys to avoid galvanic corrosion.
Yes – Incoloy 800 bolts are specifically designed for high-temperature service up to 800°C, offering excellent resistance to oxidation, carburization, and scaling. They are widely used in furnace, reformer, and heat exchanger bolting where standard stainless steels fail due to embrittlement or loss of strength.
No formal MOQ for standard sizes (M12-M36) held in stock – single-piece orders are accepted for urgent maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Flange stud bolt sets are supplied per set with no minimum. Quantity discounts apply 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