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Inconel X-750 Bolts Manufacturer & Exporter in India

Explore Inconel X-750 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 X-750 Bolts?

Inconel X-750 bolts are precipitation-hardened nickel-chromium alloy fasteners machined from UNS N07750 bar stock conforming to ASTM B637. The alloy achieves its exceptional strength through age-hardening via aluminium (0.4-1.0%) and titanium (2.25-2.75%), which form the gamma-prime (?’) Ni3(Al,Ti) precipitate phase, delivering tensile strengths exceeding 1100 MPa in the fully aged condition.

Unlike solid-solution alloys, Inconel X-750 bolts retain high clamping force at elevated temperatures up to 700°C, making them the preferred fastener for gas turbine casings, nuclear reactor internals, and high-temperature pressure vessel closures. The alloy complies with AMS 5667/5668/5669 and ASTM B637 and is widely specified under ASME Section III for nuclear-grade bolting applications worldwide.

Quick Specifications

MaterialInconel X-750
UNS NumberN07750
DIN Number2.4669
Material StandardASTM B637
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 Strength1100 MPa (160 ksi) min (aged)
Yield Strength793 MPa (115 ksi) min (aged)
HardnessMax 35 HRC / 331 HB
? All material certified by NABL-accredited laboratory. PMI and hardness survey available on request.

Complete the Fastener Set

Other Inconel X-750 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel X-750 fastener range from certified nickel-chromium superalloy bar stock, including Inconel X-750 Nuts, Inconel X-750 Screws, Inconel X-750 Washers, Inconel X-750 Studs, and Inconel X-750 Threaded Rods. All Inconel X-750 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel X-750 Nuts
Inconel X-750 Screws
Inconel X-750 Washers
Inconel X-750 Studs
Inconel X-750 Threaded Rods

Technical Data

Inconel X-750 Bolts Dimensions, Sizes & Thread Standards

Inconel X-750 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 dimensions in aged condition.

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 B637Bar/rod - UNS N07750
AMS 5667Bars, annealed
AMS 5668Bars, precipitation hardened
AMS 5669Bars, equalized & precipitation hardened
ASTM F468Fastener mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel X-750 Chemical Composition

Inconel X-750 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 B637

ElementComposition (%)
Nickel (Ni)70.0% min
Chromium (Cr)14.0-17.0%
Iron (Fe)5.0-9.0%
Titanium (Ti)2.25-2.75%
Aluminium (Al)0.40-1.00%
Niobium + Ta (Nb+Ta)0.70-1.20%
Manganese (Mn)1.00% max
Silicon (Si)0.50% max
Carbon (C)0.08% max
Cobalt (Co)1.00% max
Copper (Cu)0.50% max
? All heats verified by NABL-accredited spectrometry. PMI and full chemical certification available on request.

Why Inconel X-750 Alloy Composition Matters for Bolts

Ti + Al — Gamma-Prime Precipitation Hardening
Titanium (2.25–2.75%) and aluminium (0.40–1.00%) combine to form the Ni3(Al,Ti) gamma-prime precipitate during age hardening. This coherent precipitate phase is responsible for the alloy's tensile strength exceeding 1100 MPa and its ability to maintain clamping load at temperatures up to 700°C — critical for gas turbine and nuclear bolting.
Cr (14–17%) — Oxidation and Hot Corrosion Resistance
Chromium forms a stable Cr2O3 oxide layer that protects bolt surfaces from oxidation and hot corrosion in combustion gas environments. This allows Inconel X-750 bolts to operate continuously in gas turbine casings and exhaust manifolds without surface degradation or loss of thread integrity.
Nb + Ta (0.70–1.20%) — Grain Boundary Stabilisation
Niobium and tantalum additions stabilise grain boundaries and suppress carbide precipitation during service at elevated temperatures. This prevents stress relaxation and bolt load loss in long-term high-temperature applications such as nuclear reactor internals and steam turbine casings.

Fastener Performance

Inconel X-750 Bolts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel X-750 Bolts per ASTM. Inconel X-750 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 X-750 Bolts (Aged Condition)

Bolt SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121159242
M16275220100
M20545436160
M24950760232
M3019001520368
M3633002640534
M4252504200736
M4878006240968
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic corrosion risk at elevated temperatures.

Industry Applications

Inconel X-750 Bolts Applications — Industries & End Uses

Inconel X-750 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 X-750 bolts are the standard fastener for gas turbine casing flanges, compressor disc assemblies, combustion chamber liners, and turbine blade retaining hardware. The alloy’s gamma-prime strengthening mechanism maintains clamping force at continuous service temperatures up to 700°C, where conventional stainless steel bolts relax and lose preload. AMS 5668 specification is required by most OEM turbine manufacturers.
Inconel X-750 is listed in ASME Section III for nuclear-grade bolting of reactor pressure vessel internals, control rod drive mechanisms, and core support structures. The alloy’s resistance to stress relaxation under sustained neutron flux and high-temperature water environments makes it the preferred choice over austenitic stainless steel for long-cycle nuclear bolting applications.
High-pressure steam turbine casing bolts, valve bonnet studs, and main steam stop valve closure bolting are routinely specified in Inconel X-750 for power stations operating above 540°C. The alloy’s creep resistance and low stress relaxation rate ensure joint integrity across extended maintenance intervals without re-torquing.
Inconel X-750 bolts are used in aircraft engine exhaust nozzle flanges, afterburner hardware, thrust reverser attachment points, and nacelle structural connections where simultaneous high tensile strength and oxidation resistance to 700°C are required. Fully compliant with AMS 5667/5668/5669 for aerospace procurement.

Inconel X-750 Bolts Standards & International Certifications

Inconel X-750 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 9001:2015NACE MR0175NABL LabPED 2014/68/EUASME Section IIIMTC 3.1 / 3.2

Buy Inconel X-750 Bolts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel X-750 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 X-750 Bolts — Frequently Asked Questions

Browse expert answers to common questions about Inconel X-750 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 X-750 bolts selection and pricing.
Inconel X-750 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 are supplied per ASME B16.5 and MSS SP-75 for high-pressure flange applications. Nuclear-grade bolting is available per ASME Section III requirements. Custom thread forms including BSW, UNF, and fine-pitch metric are available on request with a 15 working day lead time.
Inconel X-750 bolts are supplied in the fully precipitation-hardened condition per AMS 5668 (solution annealed at 1093°C followed by age hardening at 704°C for 20 hours, air cooled). This delivers the minimum tensile strength of 1100 MPa required for high-temperature bolting. For nuclear applications, the equalized and precipitation-hardened condition per AMS 5669 is available, which provides improved stress rupture properties. Full heat treatment records are supplied with every order as part of the EN 10204 3.1 MTC.
Yes – Inconel X-750 is listed in ASME Section III (Division 1) for nuclear pressure boundary bolting and reactor internal fasteners. The alloy’s resistance to stress relaxation under sustained neutron irradiation and high-temperature pressurised water environments makes it the preferred specification for PWR and BWR reactor internals, control rod drive mechanisms, and core barrel bolting. Material certification to EN 10204 3.2 with TPI witness is available for nuclear procurement packages.
Inconel X-750 bolts are rated for continuous bolting service up to 700°C. Above this temperature, the gamma-prime precipitate phase begins to coarsen and dissolve, causing progressive loss of tensile strength and increased stress relaxation. For applications between 700°C and 980°C, Inconel 625 or Inconel 718 bolts should be evaluated depending on the specific load and corrosion requirements. Short-term excursions to 815°C are tolerable but will reduce long-term clamping force retention.

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