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Inconel 718 Screws Manufacturer & Exporter in India

Explore Inconel 718 Screws 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 Screws?

Inconel 718 screws 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 dual precipitation hardening mechanism involving 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 range extending to 700°C and outstanding resistance to relaxation under sustained load, Inconel 718 screws are the preferred fastener for gas turbine casings, aerospace structural joints, and high-pressure cryogenic equipment. They are manufactured and tested in accordance with AMS 5662, AMS 5664, and NACE MR0175 for sour-service applications where hardness must not exceed 40 HRC.

Quick Specifications

MaterialInconel 718
UNS NumberN07718
DIN Number2.4668
Material StandardASTM B637 / AMS 5662 / AMS 5664
Screw Standard (Metric)DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)ASME B18.3 / ASME B18.2.1
Thread FormISO Metric / UNC / UNF
Diameter RangeM4-M64 / #10-2½"
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 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 Nuts
Inconel 718 Washers
Inconel 718 Studs
Inconel 718 Threaded Rods

Technical Data

Inconel 718 Screws Dimensions, Sizes & Thread Standards

Inconel 718 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap screws) / DIN 933 (hex full thread) / ISO 4762. Custom lengths in 5 mm increments. Inch dimensions available per ASME B18.3 and ASME B18.2.1.

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Socket (mm)Min L (mm)Max L (mm)
M40.77.04.03680
M50.88.55.048100
M61.010.06.0510150
M81.2513.08.0612200
M101.516.010.0816250
M121.7518.012.01020300
M162.024.016.01425400
M202.530.020.01730500
M243.036.024.01940600
M303.545.030.02250800
M364.054.036.027601000
M424.563.042.032801000
M485.072.048.0361001200
M565.584.056.0411201500
M646.096.064.0461402000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ISO 4017Hex head screws, full threadMetric
ASME B18.3Socket head cap screwsUNC/UNF
ASME B18.2.1Hex head screwsUNC/UNF
DIN 7984Low-profile socket head screwsMetric
Material StandardRequirement
ASTM B637Bar/rod - UNS N07718
AMS 5662718 bar, annealed
AMS 5664718 bar, precipitation hardened
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 Screws 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 / AMS 5662

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
? All heats verified by NABL-accredited optical emission spectrometry. PMI available on request.

Why Inconel 718 Alloy Composition Matters for Screws

Nb+Ta (4.75–5.50%) — Precipitation Hardening via Gamma-Double-Prime
Niobium is the primary strengthening agent in Inconel 718. It forms the metastable gamma-double-prime (Ni3Nb) phase during the two-stage ageing treatment, driving tensile strength to 1241 MPa minimum — making 718 screws the highest-strength nickel alloy fastener in routine production.
Mo (2.80–3.30%) — Solid-Solution Strengthening and Corrosion Resistance
Molybdenum contributes to solid-solution strengthening and improves resistance to pitting and crevice corrosion in chloride-bearing environments. Combined with chromium at 17–21%, Inconel 718 screws resist oxidation continuously to 700°C and intermittently to 980°C.
Controlled C, P, S, B — Fatigue and Creep Performance
Tight limits on carbon (0.08% max), phosphorus, sulphur, and boron suppress grain boundary embrittlement and improve fatigue crack propagation resistance — critical for screws subjected to cyclic loading in turbine casings and rotating machinery.

Fastener Performance

Inconel 718 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel 718 Screws per ASTM. Inconel 718 screws 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 Screws (Precipitation Hardened)

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M614119
M8342718
M10685435
M121189455
M16290232130
M20570456205
M24990792295
M3019801584470
M3634502760685
?? 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 Screws Applications — Industries & End Uses

Inconel 718 Screws 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 screws are the standard fastener for gas turbine compressor casing joints, combustor liner attachments, turbine blade retaining hardware, and jet engine nacelle structural connections. Specified under AMS 5662/5664 and approved by GE Aviation, Rolls-Royce, and Pratt & Whitney material specifications. Fatigue life exceeds 107 cycles at 650°C.
Socket head cap screws and hex screws in Inconel 718 are specified for high-pressure wellhead equipment, subsurface safety valve (SSSV) bodies, and downhole tool assemblies where H2S partial pressure exceeds NACE MR0175 thresholds. Hardness controlled to 40 HRC max per NACE ISO 15156-3.
Inconel 718 screws are used in pressurised water reactor (PWR) and boiling water reactor (BWR) internals, control rod drive mechanisms, and reactor pressure vessel closure hardware. Approved under ASME Section III for Class 1 nuclear components. Radiation embrittlement resistance is superior to austenitic stainless steel at equivalent fluence levels.
The combination of high strength and excellent toughness at temperatures down to -196°C makes Inconel 718 screws the preferred choice for LNG heat exchanger closures, cryogenic valve bonnets, and liquid nitrogen storage vessel flanges where carbon steel and standard stainless fasteners suffer ductile-to-brittle transition.

Inconel 718 Screws Standards & International Certifications

Inconel 718 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015AS9100DNACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Inconel 718 Screws 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 screws selection and pricing.
Inconel 718 screws are available in socket head cap screws (DIN 912 / ISO 4762 / ASME B18.3), hex head screws (DIN 933 / ISO 4017 / ASME B18.2.1), button head socket screws (ISO 7380), flat head socket screws (DIN 7991 / ISO 10642), low-profile socket head screws (DIN 7984), and set screws (DIN 913-916). Custom drive forms including Torx, hex flange, and 12-point are available on request with 15 working day lead time.
Inconel 718 screws are supplied in the precipitation-hardened condition per AMS 2774 / AMS 5664. The standard two-stage ageing cycle is: solution anneal at 980°C for 1 hour, air cool, then age at 718°C for 8 hours, furnace cool to 621°C, hold for a total ageing time of 18 hours, then air cool. This produces minimum tensile strength of 1241 MPa and yield strength of 1034 MPa. Annealed-only condition (AMS 5662) is available on request for applications requiring subsequent customer heat treatment.
Yes – Inconel 718 is listed in NACE MR0175 / ISO 15156-3 Table A.3 for use in H2S-containing oilfield environments, subject to a maximum hardness of 40 HRC. All screws are supplied with a hardness survey per NACE requirements. For downhole applications, confirm the specific H2S partial pressure, chloride concentration, and temperature against the NACE ISO 15156-3 environmental limits before specifying.
Inconel 718 delivers significantly higher strength – 1241 MPa tensile vs 758 MPa for annealed 625 – making it the preferred choice where joint load capacity or screw size reduction is critical. Inconel 625 offers superior corrosion resistance (PREN 51+ vs approximately 30 for 718) and is preferred for seawater immersion and aggressive chemical environments. For gas turbine, aerospace, and high-pressure mechanical joints, 718 is the standard. For offshore structural connections and chemical process flanges, 625 is typically specified.

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  • Ahmedabad
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