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Inconel 800 Nuts Manufacturer & Exporter in India

Explore Inconel 800 Nuts Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1200

Max Temp

🌡

1200

Suitable for continuous service up to approximately 1200°C under typical operating conditions.

⚡

760

Typical tensile strength around 760 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.4

Typical density is approximately 8.4 g/cm³.

Product Overview

What are Inconel 800 Nuts?

Inconel 800 nuts are nickel-iron-chromium alloy fasteners manufactured from UNS N08800 bar stock conforming to ASTM B408. The alloy’s balanced composition of nickel (30-35%), chromium (19-23%), and iron (balance) delivers exceptional resistance to oxidation, carburization, and high-temperature creep in continuous service up to 815°C.

Inconel 800 nuts are specified under ASME B18.2.2 and DIN 934 for high-temperature flange assemblies, heat exchanger closures, and furnace hardware where standard austenitic stainless steel nuts fail through stress relaxation and oxidation scaling. These nuts are widely used in petrochemical, power generation, and industrial furnace applications worldwide.

Quick Specifications

MaterialInconel 800
UNS NumberN08800
DIN Number1.4876
Material StandardASTM B408
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size RangeM6-M100 / ¼"-4"
Tensile Strength517 MPa (75 ksi) min
Yield Strength207 MPa (30 ksi) min
HardnessMax 35 HRC / 192 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 800 Fastener Products Available from RealBolt

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

Technical Data

Inconel 800 Nuts Dimensions, Sizes & Thread Standards

Inconel 800 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nuts) / DIN 6915 (heavy hex nuts) / ISO 4032. Inch dimensions available per ASME B18.2.2. Custom sizes available on request. All Inconel 800 nuts dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)A/C (mm)
M61.0105.011.05
M81.25136.514.38
M101.5178.018.90
M121.751910.020.03
M162.02413.026.75
M202.53016.032.95
M243.03619.039.55
M303.54624.050.85
M364.05529.060.79
M424.56534.071.30
M485.07538.082.60
M565.58545.093.56
M646.09551.0104.86
M726.010558.0115.60
M806.011564.0127.00
M1006.014580.0160.00

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, standard heightMetric
DIN 6915Heavy hex nuts, high-strengthMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2 (high)Metric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ASME B16.5Heavy hex nuts for flangesUNC
MSS SP-75Heavy hex nuts, high-pressureUNC
Material StandardRequirement
ASTM B408Bar/rod - UNS N08800
ASTM A194Nut mechanical properties
NACE MR0175Sour service hardness control
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 800 Chemical Composition

Inconel 800 Nuts are manufactured from a nickel-chromium superalloy containing nickel (72% min), chromium (14–17%), and iron (6–10%). Each element is precisely controlled per ASTM — nickel provides chloride SCC immunity, chromium drives high-temperature oxidation resistance, and iron balances structural stability and alloy cost.

Chemical Composition per ASTM B408

ElementComposition (%)
Nickel (Ni)30.0-35.0%
Chromium (Cr)19.0-23.0%
Iron (Fe)Balance (min 39.5%)
Carbon (C)0.10% max
Aluminium (Al)0.15-0.60%
Titanium (Ti)0.15-0.60%
Manganese (Mn)1.50% max
Silicon (Si)1.00% max
Sulphur (S)0.015% max
Copper (Cu)0.75% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 800 Alloy Composition Matters for Nuts

Ni (30–35%) — High-Temperature Stability
The nickel content in Inconel 800 stabilises the austenitic matrix at elevated temperatures, preventing sigma phase formation and maintaining ductility in nuts subjected to repeated thermal cycling in furnace and heat exchanger applications.
Cr (19–23%) — Oxidation & Carburization Resistance
Chromium forms a tenacious Cr2O3 oxide layer that resists oxidation scaling up to 1100°C in intermittent service. This is critical for nuts used in furnace door frames, radiant tube supports, and reformer pigtail connections where oxidizing atmospheres are constant.
Al + Ti — Creep Resistance
The combined addition of aluminium (0.15–0.60%) and titanium (0.15–0.60%) promotes formation of fine gamma-prime precipitates that resist creep deformation under sustained bolt load at temperatures above 600°C — a failure mode that eliminates standard 316H stainless nuts from these applications.

Fastener Performance

Inconel 800 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 800 Nuts per ASTM. Inconel 800 nuts achieve 760 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Tightening Torque Reference - Inconel 800 Nuts (Metric)

Nut SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725828
M1617514065
M20345276104
M24600480152
M301200960242
M3621001680352
M4233502680485
M4849803984638
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel-iron alloys - galvanic incompatibility accelerates thread corrosion at elevated temperatures.

Industry Applications

Inconel 800 Nuts Applications — Industries & End Uses

Inconel 800 Nuts from RealBolt are specified across oil and gas, aerospace, chemical processing, and power generation where excellent corrosion resistance and 760 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Inconel 800 heavy hex nuts are the standard specification for stud bolt sets on reformer tube outlet flanges, cracker furnace pigtail connections, and transfer line exchanger nozzles. The alloy’s resistance to carburization and oxidation at 750-900°C makes it the preferred choice over 321 and 347 stainless steel nuts in these environments.
Hex nuts and heavy hex nuts for superheater outlet headers, reheater flange connections, and heat recovery steam generator (HRSG) duct expansion joint hardware. Inconel 800 nuts maintain clamping force under sustained high-temperature creep conditions where austenitic stainless nuts relax and lose preload within the first operating cycle.
Flange nuts and coupling nuts for furnace door frames, radiant tube end caps, muffle furnace shell connections, and annealing furnace conveyor support structures. The alloy’s resistance to thermal fatigue cracking and oxidation scaling in cyclic heating and cooling environments eliminates frequent nut replacement and unplanned downtime.
Hex nuts for reactor vessel nozzle connections, heat exchanger channel cover stud bolt sets, and pressure vessel manway closures in nitric acid, organic acid, and caustic soda service. Inconel 800 provides reliable corrosion resistance across a broad pH range where 316L stainless steel nuts suffer intergranular attack.

Inconel 800 Nuts Standards & International Certifications

Inconel 800 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 Inconel 800 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

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

Inconel 800 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Inconel 800 Nuts from RealBolt — covering ASTM standards, max service temperature, corrosion resistance, available sizes, lead times, and MTC certification. Contact our technical team directly for project-specific guidance on Inconel 800 nuts selection and pricing.
Inconel 800 hex nuts are available to DIN 934 (standard hex), DIN 6915 (heavy hex), ISO 4032 (style 1), ISO 4033 (style 2 high), and ASME B18.2.2 (inch hex and heavy hex). Heavy hex nuts for ASME B16.5 flange stud bolt sets are supplied per ASME B18.2.2 as standard. Custom nut profiles including coupling nuts, slotted nuts, and lock nuts are available on request with 15 working day lead time.
Inconel 800 nuts are rated for continuous service up to 815°C and intermittent service up to 1100°C. Above 815°C in continuous service, Inconel 800H or 800HT (UNS N08810 / N08811) with controlled carbon and grain size is recommended for improved creep rupture strength. Always consult your engineering team when operating above 750°C to confirm the correct alloy variant for your specific temperature and load profile.
Yes – Inconel 800 nuts are fully compatible with Inconel 800 stud bolts and are routinely supplied as matched sets for ASME B16.5 flange assemblies. Using matched alloy nuts and bolts eliminates galvanic corrosion risk and ensures consistent thermal expansion behaviour across the joint at elevated temperatures. Sets are supplied under a single EN 10204 3.1 MTC covering both components from the same heat where possible.
Use a nickel-based high-temperature anti-seize compound such as Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or Bostik Never-Seez Pure Nickel rated to at least 900°C. Apply to bolt threads and nut bearing face before assembly. Reduce target torque values by 20% compared to dry assembly values. Avoid copper-based or graphite-based anti-seize on nickel-iron alloys – copper introduces galvanic incompatibility and graphite can promote carburization at elevated temperatures.

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
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  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
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  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
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