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Inconel 718 Nuts Manufacturer & Exporter in India

Explore Inconel 718 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 718 Nuts?

Inconel 718 nuts are precipitation-hardened nickel-chromium-iron alloy fasteners machined from UNS N07718 bar stock conforming to ASTM B637. The alloy derives its exceptional strength from a controlled aging treatment that precipitates gamma-prime (Ni3Al) and gamma-double-prime (Ni3Nb) phases, delivering a minimum tensile strength of 1241 MPa in the aged condition – nearly double that of annealed Inconel 625.

With a service temperature ceiling of 650°C and outstanding resistance to stress corrosion cracking, Inconel 718 nuts are the fastener of choice for gas turbine casings, aerospace structural joints, and high-pressure sour-service wellhead assemblies. They are fully compliant with NACE MR0175/ISO 15156 at hardness levels up to 40 HRC and are listed under AMS 5662 and AMS 5664 for aerospace procurement.

Quick Specifications

MaterialInconel 718
UNS NumberN07718
DIN Number2.4668
Material StandardASTM B637
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength1241 MPa (180 ksi) min
Yield Strength1034 MPa (150 ksi) min
HardnessMax 40 HRC / 388 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Inconel 718 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Inconel 718 fastener range from certified nickel-chromium superalloy bar stock, including Inconel 718 Bolts, Inconel 718 Screws, Inconel 718 Washers, Inconel 718 Studs, and Inconel 718 Threaded Rods. All Inconel 718 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Inconel 718 Bolts
Inconel 718 Screws
Inconel 718 Washers
Inconel 718 Studs
Inconel 718 Threaded Rods

Technical Data

Inconel 718 Nuts Dimensions, Sizes & Thread Standards

Inconel 718 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. Custom widths across flats available. Inch dimensions per ASME B18.2.2. All Inconel 718 nuts dimensions are verified against applicable DIN, ISO, and ASME

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
M121.751910.020.78
M162.02413.026.75
M202.53016.033.53
M243.03619.039.98
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, structuralMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2 (tall)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 B637Bar/rod - UNS N07718
ASTM F467Fastener mechanical properties
NACE MR0175Sour service =40 HRC
AMS 5662Bars, annealed condition
AMS 5664Bars, precipitation hardened
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 718 Chemical Composition

Inconel 718 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 B637

ElementComposition (%)
Nickel + Cobalt (Ni+Co)50.0-55.0%
Chromium (Cr)17.0-21.0%
Iron (Fe)Balance
Niobium + Tantalum (Nb+Ta)4.75-5.50%
Molybdenum (Mo)2.80-3.30%
Titanium (Ti)0.65-1.15%
Aluminium (Al)0.20-0.80%
Cobalt (Co)1.0% max
Carbon (C)0.08% max
Manganese (Mn)0.35% max
Silicon (Si)0.35% max
Phosphorus (P)0.015% max
Sulphur (S)0.015% max
Boron (B)0.006% max
Copper (Cu)0.30% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel 718 Alloy Composition Matters for Nuts

Nb+Ta (4.75–5.50%) — Precipitation Hardening via Gamma-Double-Prime
Niobium is the primary strengthening agent in Inconel 718. During the two-stage aging cycle (720°C/8h + 620°C/8h), niobium precipitates as the metastable gamma-double-prime (Ni3Nb) phase, raising tensile strength to 1241 MPa minimum — making these nuts suitable for critical bolted joints in gas turbines and pressure vessels.
Cr (17–21%) — Oxidation and Corrosion Resistance
Chromium forms a stable Cr2O3 passive film that resists oxidation up to 650°C in continuous service and provides adequate resistance to mild acids and chloride environments. Combined with molybdenum, it ensures the nut threads remain corrosion-free in sour gas and offshore environments.
Controlled C, P, S, B — Grain Boundary Integrity
The tightly controlled carbon (0.08% max), phosphorus (0.015% max), sulphur (0.015% max), and boron (0.006% max) limits prevent grain boundary embrittlement and sensitisation during the aging heat treatment, ensuring the nut retains full ductility and impact toughness after precipitation hardening.

Fastener Performance

Inconel 718 Nuts Mechanical Properties & Proof Load Reference

The table below lists mechanical properties and proof load reference for Inconel 718 Nuts per ASTM. Inconel 718 nuts achieve 760 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Proof Load & Torque Reference - Inconel 718 Heavy Hex Nuts

Nut SizeProof Load (kN)Recommended Torque Dry (Nm)Recommended Torque Lubricated (Nm)
M126811592
M16122280224
M20192560448
M24278970776
M3044119401552
M3663833802704
M4287254004320
M48114080006400
?? 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 alloys - galvanic corrosion risk at thread contact surfaces.

Industry Applications

Inconel 718 Nuts Applications — Industries & End Uses

Inconel 718 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 718 heavy hex nuts and coupling nuts are the standard specification for gas turbine casing bolted joints, compressor disc assemblies, and combustor liner attachment hardware. The alloy’s gamma-double-prime strengthening mechanism retains full proof load capacity up to 650°C, making it the preferred choice over Inconel 625 where elevated-temperature mechanical strength is the primary design driver. AMS 5664 specification.
Heavy hex nuts paired with B7M stud bolts or Inconel 718 stud bolts are specified for ASME B16.5 Class 900-2500 wellhead flanges, BOP stack connections, and Christmas tree assemblies in H2S-bearing sour service. Fully compliant with NACE MR0175/ISO 15156 at hardness =40 HRC. Shell DEP and ExxonMobil EMSP listed for sour-service flange nut applications.
Inconel 718 nuts are used in aircraft engine mount attachments, nacelle structural fastener assemblies, and thrust reverser locking hardware where the combination of high tensile strength (1241 MPa), fatigue resistance, and oxidation resistance to 650°C is required simultaneously. Supplied to AMS 5662/5664 with full material traceability per AS9100D.
Inconel 718 nuts are specified for reactor pressure vessel (RPV) closure stud assemblies, control rod drive mechanism (CRDM) flanges, and primary coolant loop bolted connections in PWR and BWR plants. The alloy’s resistance to stress corrosion cracking in high-temperature pressurised water and its low cobalt content (1.0% max) minimise activation concerns. Supplied per ASME Section III requirements.

Inconel 718 Nuts Standards & International Certifications

Inconel 718 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 9001:2015AS9100DNACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Inconel 718 Nuts from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Inconel 718 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 718 Nuts — Frequently Asked Questions

Browse expert answers to common questions about Inconel 718 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 718 nuts selection and pricing.
Inconel 718 hex nuts are available to DIN 934 (standard hex, metric), DIN 6915 (heavy hex, metric), ISO 4032 (style 1), ISO 4033 (style 2 tall), and ASME B18.2.2 (inch hex and heavy hex). For ASME B16.5 flange applications, heavy hex nuts per ASME B18.2.2 are standard. Coupling nuts, jam nuts, and slotted nuts are available on request. Custom thread forms including BSW, UNF, and BSPP can be produced with a 15 working day lead time.
Inconel 718 nuts are supplied in the precipitation-hardened (aged) condition per AMS 2774. The standard two-stage aging cycle is: solution anneal at 980°C, then age at 720°C for 8 hours, furnace cool to 620°C, hold for a further 8 hours, then air cool. This produces the gamma-double-prime (Ni3Nb) precipitate responsible for the 1241 MPa minimum tensile strength. Nuts supplied in the annealed-only condition have significantly lower strength and are not suitable for structural or pressure-containing applications.
Yes – Inconel 718 nuts are routinely paired with Inconel 718 stud bolts for gas turbine and aerospace applications. However, galling risk is elevated when identical alloys are used together under high contact pressure. Always apply a nickel-based anti-seize compound (Molykote P-37 or Jet-Lube KOPR-KOTE Pure Nickel) to all thread surfaces and the nut bearing face before assembly. For oil and gas flange applications, Inconel 718 nuts are frequently paired with B7M or L7M stud bolts per ASME B16.5 requirements.
The key difference is strengthening mechanism and maximum service temperature. Inconel 718 nuts are precipitation hardened to 1241 MPa tensile strength and are rated to 650°C continuous service – ideal for gas turbines, aerospace, and high-pressure wellheads. Inconel 625 nuts are solid-solution strengthened to 758 MPa and are rated to 980°C, with superior corrosion resistance (PREN 51+) in seawater and aggressive chemical environments. Choose Inconel 718 where mechanical strength governs the design; choose Inconel 625 where corrosion resistance or higher temperature oxidation resistance is the primary requirement.

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