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Inconel 718 Studs Manufacturer & Exporter in India

Explore Inconel 718 Studs 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 Studs?

Inconel 718 studs are precipitation-hardened nickel-chromium-iron alloy fasteners manufactured from UNS N07718 bar stock conforming to ASTM B637. The alloy derives its exceptional strength from gamma-prime and gamma-double-prime precipitate phases formed during a two-stage age hardening treatment, delivering a minimum tensile strength of 1241 MPa – nearly double that of annealed Inconel 625.

The combination of high tensile strength, excellent fatigue resistance, and oxidation resistance up to 700°C makes Inconel 718 studs the preferred choice for gas turbine casing joints, aerospace structural connections, and high-pressure wellhead bolting. These studs are specified under AMS 5662/5663, ASTM B637, and NACE MR0175/ISO 15156 for sour-service applications where both strength and corrosion resistance are simultaneously required.

Quick Specifications

MaterialInconel 718
UNS NumberN07718
DIN Number2.4668
Material StandardASTM B637
Stud Standard (Metric)DIN 938 / DIN 939 / ISO 4032
Stud Standard (Inch)ASME B18.31.2 / ASME B16.5
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 and hardness survey 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 Nuts, Inconel 718 Screws, Inconel 718 Washers, 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 Nuts
Inconel 718 Screws
Inconel 718 Washers
Inconel 718 Threaded Rods

Technical Data

Inconel 718 Studs Dimensions, Sizes & Thread Standards

Inconel 718 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (metal-end stud) / DIN 939 (stud bolt) / ASME B18.31.2. Custom lengths in 5 mm increments. Inch dimensions available per ASME B16.5 and MSS SP-75. All Inconel 718 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 939 / ISO 4032)

Size (M)Pitch (mm)Thread Length (mm)Body Dia (mm)Min L (mm)Max L (mm)
M61.0126.020200
M81.25168.025250
M101.52010.030300
M121.752412.035400
M162.03216.045500
M202.54020.055600
M243.04824.065700
M303.56030.080900
M364.07236.01001000
M424.58442.01201200
M485.09648.01401500
M565.511256.01601800
M646.012864.01802000
M726.014472.02002200
M806.016080.02202500
M1006.0200100.02603000

Dimensional & Material Standards

StandardCoversThread
DIN 938Studs, metal-end typeMetric
DIN 939Studs, long-end typeMetric
ISO 4032Hex nuts for studsMetric
ASME B18.31.2Continuous thread studsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75High-pressure stud boltsUNC
AMS 5662Bar, solution annealed-
AMS 5663Bar, precipitation hardened-
Material StandardRequirement
ASTM B637Bar/rod - UNS N07718
ASTM F467Fastener nuts, nickel alloy
NACE MR0175Sour service =40 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel 718 Chemical Composition

Inconel 718 Studs 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 optical emission spectrometry. PMI available on request.

Why Inconel 718 Alloy Composition Matters for Studs

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 ageing treatment (720°C/8h + 620°C/8h), niobium forms the metastable gamma-double-prime (Ni3Nb) phase that gives Inconel 718 studs their exceptional tensile strength of 1241 MPa — far exceeding any solid-solution nickel alloy fastener.
Mo (2.80–3.30%) — Corrosion Resistance in Aggressive Media
Molybdenum contributes to resistance against pitting and crevice corrosion in chloride-bearing environments. While not as corrosion-resistant as Inconel 625, Inconel 718 studs perform reliably in mildly sour gas service and process environments where high mechanical load is the primary design driver.
Controlled Ageing — Predictable Strength Without Overageing Risk
The gamma-double-prime phase in Inconel 718 is kinetically sluggish, meaning the alloy resists overageing at service temperatures below 650°C. This makes Inconel 718 studs dimensionally and mechanically stable over long service intervals in gas turbine and pressure vessel applications.

Fastener Performance

Inconel 718 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 718 Studs per ASTM. Inconel 718 studs 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 718 Studs (Age Hardened)

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M1214511652
M16355284127
M20695556200
M241200960291
M3024001920462
M3641803344672
M4266505320924
M48987078961215
?? 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.

Industry Applications

Inconel 718 Studs Applications — Industries & End Uses

Inconel 718 Studs 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 stud bolt sets are the standard specification for ASME B16.5 Class 900-2500 wellhead flanges, blowout preventer (BOP) ram bonnets, and Christmas tree body connections where both high tensile load and H2S sour service resistance are required simultaneously. Compliant with NACE MR0175/ISO 15156 at hardness =40 HRC.
Inconel 718 studs are used extensively in gas turbine compressor casing joints, turbine rear frame connections, and combustor liner attachment hardware. The alloy’s fatigue strength and resistance to stress relaxation at temperatures up to 650°C make it the dominant fastener material in both commercial and military aero-engine assemblies per AMS 5662/5663.
Stud bolt sets for reactor pressure vessel (RPV) head closures, steam generator channel head flanges, and pressuriser nozzle connections are manufactured from Inconel 718 per ASME Section III requirements. The alloy’s low cobalt content minimises activation under neutron flux, and its high yield strength reduces stud count per flange.
Inconel 718 studs retain excellent toughness and tensile properties at cryogenic temperatures down to -196°C, making them suitable for LNG storage tank nozzle flanges, cryogenic valve bonnets, and liquid nitrogen process equipment where carbon steel and standard stainless fasteners suffer ductile-to-brittle transition.

Inconel 718 Studs Standards & International Certifications

Inconel 718 Studs 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 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2AS9100D

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

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

Browse expert answers to common questions about Inconel 718 Studs 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 studs selection and pricing.
Solution-annealed Inconel 718 studs (AMS 5662) have a tensile strength of approximately 896 MPa and are used where formability or weldability is the priority. Age-hardened studs (AMS 5663) undergo a two-stage precipitation treatment – 720°C for 8 hours followed by 620°C for 8 hours – which raises tensile strength to a minimum of 1241 MPa through formation of the gamma-double-prime (Ni3Nb) phase. For structural bolting, pressure vessel flanges, and wellhead applications, age-hardened condition is always specified. Solution-annealed studs are only used where the assembly will be welded in place and post-weld heat treatment is planned.
Yes – Inconel 718 studs are listed in NACE MR0175/ISO 15156-3 Table A.3 for use in H2S sour service environments, subject to a maximum hardness of 40 HRC. Our studs are manufactured and age-hardened to achieve 36-39 HRC, with a full hardness survey report available per NACE requirements. For Class 900-2500 wellhead flange stud bolt sets, we supply matched stud and nut sets with a single EN 10204 3.1 MTC covering both components and confirming NACE compliance.
Inconel 718 studs should be paired with Inconel 718 heavy hex nuts per ASTM A194 Grade 8 equivalent or Inconel 718 nuts per ASTM B637/AMS 5663. For ASME B16.5 flange stud bolt sets, we supply 2H heavy hex nuts in Inconel 718 as standard. Using mismatched nut materials – particularly lower-strength alloys – risks thread stripping under the high clamp loads generated by age-hardened 718 studs. Galling is controlled by applying nickel-based anti-seize to all threads before assembly.
Inconel 718 studs are rated for continuous service up to 700°C. Above this temperature, the gamma-double-prime strengthening phase begins to dissolve and transform to the equilibrium delta phase (Ni3Nb orthorhombic), causing progressive loss of tensile strength and creep resistance. For applications above 700°C – such as gas turbine hot section hardware – Inconel 625, Waspaloy, or Inconel 740H studs are more appropriate choices. We can advise on alloy selection based on your specific operating temperature and load profile.

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  • Ahmedabad
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