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Incoloy 800HT Screws Manufacturer & Exporter in India

Explore Incoloy 800HT 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 800HT Screws?

Incoloy 800HT screws are high-temperature nickel-iron-chromium alloy fasteners manufactured from UNS N08811 bar stock, conforming to ASTM B408. The alloy’s enhanced carbon (0.06-0.10%) and aluminum/titanium content provide superior creep and rupture strength compared to standard Incoloy 800, making these screws ideal for service above 600°C.

With excellent resistance to oxidation, carburization, and sulfidation, Incoloy 800HT screws are specified for critical bolted joints in heat exchangers, reformer tubes, and furnace assemblies. They maintain mechanical integrity and dimensional stability in prolonged high-temperature environments, meeting the requirements of petrochemical, power generation, and thermal processing industries.

Quick Specifications

MaterialIncoloy 800HT
UNS NumberN08811
DIN Number1.4959 / 1.4876
Material StandardASTM B408
Screw Standard (Metric)DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)ASME B18.3 / B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M48 / ¼"-2"
Tensile Strength600 MPa (87 ksi) min
Yield Strength275 MPa (40 ksi) min
HardnessMax 85 HRB / 200 HB
? All material certified by NABL-accredited laboratory. PMI and heat traceability available on request.

Complete the Fastener Set

Other Incoloy 800HT Fastener Products Available from RealBolt

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

Technical Data

Incoloy 800HT Screws Dimensions, Sizes & Thread Standards

Incoloy 800HT Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap), DIN 933 (hex full thread), ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3 and B18.2.1. All Incoloy 800HT screws dimensions conform to 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)
M61.0106.0510120
M81.25138.0612150
M101.51610.0816200
M121.751812.01020250
M162.02416.01425300
M202.53020.01730400
M243.03624.01940500
M303.54530.02250600
M364.05436.02760800
M424.56342.032801000
M485.07248.0361001200

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ASME B18.3Socket cap screwsUNC/UNF
ASME B18.2.1Hex screwsUNC/UNF
Material StandardRequirement
ASTM B408Bar/rod - UNS N08811
ASTM F468Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800HT Chemical Composition

Incoloy 800HT 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 B408

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.06-0.10
Aluminum (Al)0.25-0.60
Titanium (Ti)0.25-0.60
Manganese (Mn)1.5 max
Silicon (Si)1.0 max
Sulfur (S)0.015 max
Copper (Cu)0.75 max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Incoloy 800HT Alloy Composition Matters for Screws

Al + Ti (0.25–0.60% each) — Creep Strength
Aluminum and titanium combine to form a stable gamma prime phase, significantly improving creep and rupture strength at elevated temperatures, making Incoloy 800HT screws reliable for long-term high-heat service.
Low Carbon (0.06–0.10%) — Carbide Control
The controlled carbon content minimizes carbide precipitation at grain boundaries, reducing the risk of intergranular corrosion and ensuring mechanical stability after prolonged exposure to high temperatures.
High Nickel & Chromium — Oxidation Resistance
The high nickel and chromium content provides excellent resistance to oxidation, carburization, and sulfidation, essential for screws used in furnace and heat exchanger assemblies.

Fastener Performance

Incoloy 800HT Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800HT Screws per ASTM. Incoloy 800HT 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)
M8282213
M10564521
M12987830
M1624019260
M2047037694
M24820656136
M3016201296220
M3628002240320
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Avoid copper-based anti-seize on nickel alloys.

Industry Applications

Incoloy 800HT Screws Applications — Industries & End Uses

Incoloy 800HT 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 800HT screws are the preferred choice for bolting radiant coils, tube sheets, and structural supports in ethylene cracking furnaces, reformers, and hydrogen production units. Their high creep strength and oxidation resistance ensure reliable performance in continuous operation above 700°C.
Used for fastening superheater and reheater tube supports, ductwork, and expansion joints in coal-fired and combined cycle power plants. Incoloy 800HT screws withstand thermal cycling and high-temperature corrosion from flue gases.
Ideal for securing trays, fixtures, and lining panels in continuous and batch heat treatment furnaces, annealing ovens, and carburizing chambers. The alloy’s stability prevents distortion and maintains joint integrity at elevated temperatures.
Specified for bolting in nitric acid coolers, urea reactors, and process piping where resistance to stress corrosion cracking and intergranular attack is critical. Incoloy 800HT screws offer long service life in aggressive chemical environments.

Incoloy 800HT Screws Standards & International Certifications

Incoloy 800HT 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 9001:2015PED 2014/68/EUNABL LabEN 10204 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800HT 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 800HT Screws — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800HT 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 800HT screws selection and pricing.
Incoloy 800HT screws are available to DIN 912 (socket head cap), DIN 933 (hex full thread), ISO 4762, and ASME B18.3 (inch socket cap). Custom thread forms (UNC, UNF, BSW, BSF) and special lengths can be supplied with short lead times.
Use nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and under heads to prevent galling and seizing at high temperatures. Avoid copper-based anti-seize to prevent galvanic corrosion with nickel alloys. Lubricated torque values should be reduced by 20%.
Yes – Incoloy 800HT screws are engineered for continuous service up to 1100°C, offering excellent creep and rupture strength, oxidation resistance, and dimensional stability. They are widely used in furnace, reformer, and superheater assemblies where standard stainless steel fasteners fail.
There is no formal MOQ for standard sizes (M8-M24) available ex-stock; single-piece orders are accepted for urgent maintenance. Custom sizes or non-standard threads typically require a 10 kg minimum. Bulk 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