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Incoloy 800H Screws Manufacturer & Exporter in India

Explore Incoloy 800H 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 800H Screws?

Incoloy 800H screws are high-temperature nickel-iron-chromium alloy fasteners manufactured from UNS N08810 bar stock in accordance with ASTM B408. The alloy’s increased carbon content (0.05-0.10%) and controlled grain size provide superior creep and rupture strength above 600°C, making these screws ideal for demanding thermal cycling and oxidation-prone environments.

Incoloy 800H screws are specified for use in heat exchangers, furnace hardware, petrochemical reactors, and superheater assemblies where standard stainless steels fail due to grain boundary embrittlement or loss of mechanical properties at elevated temperatures. All fasteners are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 800H
UNS NumberN08810
DIN Number1.4958
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-M64 / ¼"-2½"
Tensile Strength450 MPa (65 ksi) min
Yield Strength205 MPa (30 ksi) min
HardnessMax 85 HRB / 180 HB
? All material certified by NABL-accredited laboratory. PMI and grain size verification available on request.

Complete the Fastener Set

Other Incoloy 800H Fastener Products Available from RealBolt

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

Technical Data

Incoloy 800H Screws Dimensions, Sizes & Thread Standards

Incoloy 800H 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 800H 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)
M61.0106.0510100
M81.25138.0612120
M101.51610.0816150
M121.751812.01020200
M162.02416.01425250
M202.53020.01730300
M243.03624.01940400
M303.54530.02250500
M364.05436.02760600

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 N08810
ASTM F468Fastener mechanical
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800H Chemical Composition

Incoloy 800H 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)0.05-0.10
Aluminium (Al)0.15-0.60
Titanium (Ti)0.15-0.60
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 and grain size verification available on request.

Why Incoloy 800H Alloy Composition Matters for Screws

High Nickel & Chromium — Oxidation Resistance
The high nickel and chromium content ensures Incoloy 800H screws resist scaling and oxidation up to 1100°C, making them ideal for furnace and heat exchanger assemblies.
Al + Ti Stabilisation — Creep Strength
Aluminium and titanium additions stabilize the austenitic structure, providing excellent creep and rupture strength at elevated temperatures, critical for fasteners in thermal cycling service.
Controlled Carbon — Grain Boundary Stability
The controlled carbon range (0.05–0.10%) in 800H prevents grain boundary embrittlement and maintains ductility after long-term exposure to high temperatures.

Fastener Performance

Incoloy 800H Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800H Screws per ASTM. Incoloy 800H 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)
M8252012
M10504019
M12856828
M1621016856
M2041032888
M24710568127
?? 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 800H Screws Applications — Industries & End Uses

Incoloy 800H 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 800H screws are the preferred fasteners for tube sheets, supports, and structural assemblies in ethylene cracking furnaces, reformers, and refinery heater boxes due to their resistance to carburization and high-temperature oxidation.
Used for bolting superheater tubes, HRSG ductwork, and steam generator internals where creep strength and oxidation resistance are critical at sustained temperatures above 600°C.
Socket head cap screws and hex screws for furnace doors, trays, and fixtures exposed to repeated thermal cycling and high-temperature atmospheres, preventing embrittlement and scaling.
Fasteners for pressure vessel closures, agitator assemblies, and reactor internals in nitric acid, urea, and ammonium nitrate plants where resistance to stress corrosion cracking is required.

Incoloy 800H Screws Standards & International Certifications

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

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

Browse expert answers to common questions about Incoloy 800H 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 800H screws selection and pricing.
Incoloy 800H 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 are available on request with typical lead times of 2-3 weeks.
Use a nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and under the screw head to prevent galling and seizing at high temperatures. Avoid copper-based anti-seize to prevent galvanic corrosion with nickel alloys.
Yes – Incoloy 800H screws are engineered for continuous service up to 1100°C, with excellent creep and rupture strength. They are the industry standard for furnace, reformer, and superheater bolting where stainless steel fasteners would fail.
No MOQ for standard sizes (M8-M24) available ex-stock. Custom sizes or non-standard threads typically require a 10 kg minimum order. Price breaks are available at 50, 200, and 500 pieces. Sample orders for urgent maintenance are accepted.

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