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Inconel 800 Bolts Manufacturer & Exporter in India

Explore Inconel 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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-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 Bolts?

Inconel 800 bolts 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 a minimum tensile strength of 517 MPa in the annealed condition, with exceptional resistance to oxidation and carburization at elevated temperatures up to 1100°C.

Inconel 800 bolts are widely specified under ASME Section VIII and API 660 for heat exchanger shell and tube connections, furnace hardware, and high-temperature process flanges where carbon steel and stainless steel fasteners fail through creep or oxidation. The alloy’s stable austenitic structure prevents sigma-phase embrittlement during long-term thermal cycling service.

Quick Specifications

MaterialInconel 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 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 Nuts, 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 Nuts
Inconel 800 Screws
Inconel 800 Washers
Inconel 800 Studs
Inconel 800 Threaded Rods

Technical Data

Inconel 800 Bolts Dimensions, Sizes & Thread Standards

Inconel 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 Inconel 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 properties
ASME SB-408Boiler & pressure vessel code
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 800 Chemical Composition

Inconel 800 Bolts 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 Bolts

Ni (30–35%) + Cr (19–23%) — High-Temperature Oxidation Resistance
The nickel-chromium balance in Inconel 800 forms a stable, adherent chromium oxide scale that resists oxidation and carburization up to 1100°C. Bolt heads and thread roots remain dimensionally stable through repeated thermal cycling, preventing loosening in furnace and reformer flange connections.
Al + Ti (0.15–0.60% each) — Creep Strength Enhancement
Aluminium and titanium additions promote the formation of fine gamma-prime precipitates during service at elevated temperatures. This mechanism significantly improves creep rupture strength compared to plain austenitic stainless steels, making Inconel 800 bolts the preferred choice for long-term high-temperature flange retention.
Stable Austenitic Iron-Nickel Matrix
Unlike ferritic or duplex grades, the fully austenitic structure of Inconel 800 does not undergo sigma-phase embrittlement or 475°C embrittlement during prolonged service. Bolts retain adequate ductility for safe removal and replacement after years of high-temperature service — a critical maintenance consideration for petrochemical plant operators.

Fastener Performance

Inconel 800 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 800 Bolts per ASTM. Inconel 800 bolts 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 Bolts

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12554420
M1613010448
M2026020877
M24450360111
M30900720177
M3615701256257
M4225002000354
M4837102968465
?? 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 at elevated temperatures.

Industry Applications

Inconel 800 Bolts Applications — Industries & End Uses

Inconel 800 Bolts 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 hex bolts and stud bolts are the standard specification for fired heater tube support hangers, reformer furnace flange connections, and radiant section hardware operating continuously above 700°C. The alloy’s resistance to carburization and oxidation in hydrocarbon-rich atmospheres makes it the preferred choice over 310 stainless steel for long-term furnace service.
Flange stud bolt sets for shell-and-tube heat exchangers per TEMA Class B/C, heat recovery steam generator (HRSG) duct flanges, and superheater header connections where thermal cycling between ambient and 900°C demands a fastener material with stable creep properties and no risk of sigma-phase embrittlement during extended service.
Inconel 800 bolts are specified for reactor closure flanges, pressure vessel nozzle connections, and piping flanges in nitric acid, organic acid, and mixed oxidizing environments where temperatures exceed the capability of 316L or 321 stainless steel. Particularly suited to vinyl chloride monomer (VCM) and ethylene cracker service.
Stud bolt sets for high-pressure steam boiler drum connections, superheater outlet headers, and main steam isolation valve flanges operating in the 500-700°C range. Inconel 800 bolts comply with ASME Section I and Section VIII requirements for elevated-temperature pressure boundary fasteners, providing reliable long-term joint integrity under sustained thermal load.

Inconel 800 Bolts Standards & International Certifications

Inconel 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 9001:2015ASME Section VIIINABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Inconel 800 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Inconel 800 Bolts 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 bolts selection and pricing.
Inconel 800 hex bolts are manufactured to DIN 931 (metric partial thread), DIN 933 (metric full thread), ISO 4014/4017, and ASME B18.2.1 for inch hex and heavy hex configurations. Stud bolts for flange applications are supplied per ASME B16.5 and MSS SP-75. Custom thread forms including BSW, BSF, and Whitworth are available on request with a standard lead time of 15 working days. All bolts are supplied with EN 10204 3.1 mill test certificates as standard.
Inconel 800 bolts are rated for continuous service up to 1100°C in oxidizing atmospheres and up to 1000°C in mildly reducing or carburizing environments. At these temperatures, the alloy forms a stable chromium oxide scale that prevents further oxidation. For applications above 980°C requiring higher creep rupture strength, consider upgrading to Inconel 800H (UNS N08810) or Inconel 800HT (UNS N08811), which feature controlled carbon and grain size for improved long-term elevated-temperature performance.
Yes – Inconel 800 (UNS N08800) is listed in ASME Section II Part D for allowable stress values at elevated temperatures, and ASME SB-408 covers the bar stock from which fasteners are machined. Inconel 800 bolts are accepted under ASME Section VIII Division 1 for pressure vessel flange connections operating in the creep range. Design engineers should reference ASME Section II Part D Table 1B for temperature-dependent allowable stress values when sizing bolt patterns for high-temperature flanged joints.
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 Special. These compounds remain effective up to 1200°C and prevent galling and thread seizure during installation and subsequent removal after high-temperature service. Apply to bolt threads and nut bearing faces and reduce target torque values by approximately 20% compared to dry assembly values. Never use copper-based or graphite-based anti-seize on nickel-iron alloy fasteners at elevated temperatures.

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