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Inconel X-750 Nuts Manufacturer & Exporter in India

Explore Inconel X-750 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 X-750 Nuts?

Inconel X-750 nuts are precipitation-hardened nickel-chromium alloy fasteners manufactured from UNS N07750 bar stock conforming to ASTM B637. The alloy achieves its exceptional strength through gamma-prime precipitation hardening via aluminium (0.4-1.0%) and titanium (2.25-2.75%), delivering tensile strengths exceeding 1100 MPa in the age-hardened condition – significantly higher than solid-solution nickel alloys.

Inconel X-750 nuts are specified under AMS 5698 and AMS 5699 for gas turbine engine hardware, nuclear reactor internals, and high-temperature pressure vessel closures where sustained clamping force at temperatures up to 700°C is non-negotiable. The alloy’s resistance to stress relaxation makes it the preferred choice wherever conventional stainless steel or Inconel 625 nuts lose preload under thermal cycling.

Quick Specifications

MaterialInconel X-750
UNS NumberN07750
DIN Number2.4669
Material StandardASTM B637
Nut Standard (Metric)DIN 934 / DIN 6915 / ISO 4032
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size 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 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 Bolts, 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 Bolts
Inconel X-750 Screws
Inconel X-750 Washers
Inconel X-750 Studs
Inconel X-750 Threaded Rods

Technical Data

Inconel X-750 Nuts Dimensions, Sizes & Thread Standards

Inconel X-750 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nuts) / DIN 6915 (heavy hex) / ISO 4032. Custom widths across flats available. Inch dimensions per ASME B18.2.2. All Inconel X-750 nuts dimensions are verified against applicable DIN, ISO, and ASME B18

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
M202.53016.032.95
M243.03619.039.55
M303.54624.050.85
M364.05529.060.79
M424.56534.071.30
M485.07538.082.60
M565.58545.093.56
M646.09551.0104.86
M726.010558.0116.16
M806.011564.0127.46
M1006.014580.0160.00

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, standard heightMetric
DIN 6915Heavy hex nuts, high-strengthMetric
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 N07750
AMS 5698Bar, annealed condition
AMS 5699Bar, age-hardened condition
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel X-750 Chemical Composition

Inconel X-750 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 (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 available on request.

Why Inconel X-750 Alloy Composition Matters for Nuts

Ti (2.25–2.75%) + Al (0.40–1.00%) — Gamma-Prime Precipitation Hardening
Titanium and aluminium combine with nickel to form the Ni3(Al,Ti) gamma-prime phase during age hardening. This precipitation mechanism is what gives Inconel X-750 nuts their high-temperature strength and resistance to stress relaxation — critical for maintaining bolt preload in gas turbine and nuclear applications.
Cr (14–17%) — Oxidation and Hot Corrosion Resistance
Chromium forms a stable Cr2O3 oxide layer that protects nut bearing surfaces and thread flanks from oxidation at temperatures up to 700°C. This is essential in gas turbine casing joints and exhaust manifold connections where nuts are exposed to hot combustion gases.
Nb + Ta (0.70–1.20%) — Grain Boundary Stabilisation
Niobium and tantalum stabilise grain boundaries and suppress carbide precipitation during service at elevated temperatures. This prevents intergranular attack in the thread root — the highest stress concentration point in any nut — during long-term thermal exposure.

Fastener Performance

Inconel X-750 Nuts Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Inconel X-750 Nuts per ASTM. Inconel X-750 nuts 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 Nuts (Age-Hardened)

Nut SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M121058438
M1625520492
M20510408148
M24880704214
M3017601408340
M3630602448494
M4248803904680
M4872405792895
?? 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 elevated temperatures.

Industry Applications

Inconel X-750 Nuts Applications — Industries & End Uses

Inconel X-750 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 X-750 heavy hex nuts are the standard specification for gas turbine casing joint studs, compressor disc through-bolt assemblies, and combustion chamber flange connections. AMS 5698/5699 compliant. Approved under GE Aviation, Rolls-Royce, and Pratt & Whitney material specifications for hot-section hardware operating continuously above 500°C.
Hex nuts and heavy hex nuts for reactor pressure vessel (RPV) closure stud assemblies, control rod drive mechanism (CRDM) flanges, and primary coolant loop piping connections. Inconel X-750 is listed in ASME Section III for Class 1 nuclear components due to its resistance to stress relaxation and irradiation embrittlement at reactor operating temperatures.
Flange nut sets for ASME Section VIII pressure vessel closures, heat exchanger channel covers (TEMA Class R), and autoclave door studs in chemical processing environments where sustained preload at 500-700°C is required. Inconel X-750 nuts maintain clamping force through thermal cycles that cause stainless steel nuts to relax and leak.
Heavy hex nuts for high-pressure wellhead flange connections, Christmas tree assemblies, and subsurface safety valve (SSSV) housings where combined high temperature, high pressure, and H2S sour service demand both NACE MR0175 compliance and superior stress relaxation resistance beyond what Inconel 625 provides.

Inconel X-750 Nuts Standards & International Certifications

Inconel X-750 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 9001:2015NACE MR0175NABL LabAS9100DMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Inconel X-750 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 X-750 nuts selection and pricing.
Inconel X-750 hex nuts are available to DIN 934 (standard hex), DIN 6915 (heavy hex, high-strength), ISO 4032 (style 1), ISO 4033 (style 2, tall), and ASME B18.2.2 (inch hex and heavy hex). Heavy hex nuts for ASME B16.5 flange stud bolt sets are supplied per ASME B18.2.2 with thread form to ASME B1.1 (UNC). Custom nut profiles including coupling nuts, slotted nuts, and castle nuts are available on request with 15 working day lead time.
Inconel X-750 nuts are available in two heat treatment conditions. Annealed (AMS 5698) provides moderate strength (approximately 758 MPa tensile) and is used where forming or further machining is required after supply. Age-hardened (AMS 5699) – solution annealed at 1093°C then aged at 843°C for 24 hours – delivers the full 1100 MPa tensile strength required for gas turbine and nuclear applications. Always specify the condition at time of order. Nuts supplied in the annealed condition cannot be re-aged after installation without dimensional distortion.
Yes – Inconel X-750 is listed in ASME Boiler and Pressure Vessel Code Section III (Nuclear Components) for Class 1 pressure boundary fasteners. The alloy’s gamma-prime precipitation hardening mechanism provides exceptional resistance to stress relaxation under sustained load at reactor operating temperatures (280-320°C for PWR primary circuits). It also demonstrates superior resistance to irradiation embrittlement compared to austenitic stainless steel fasteners. Supply with EN 10204 3.2 TPI-witnessed MTC and full heat traceability is standard for nuclear applications.
Inconel X-750 nuts retain useful mechanical properties up to approximately 700°C in continuous service. Above this temperature, the gamma-prime precipitate begins to coarsen (over-ageing), causing a gradual reduction in yield strength and increased stress relaxation. For applications above 700°C, Inconel 718 or Waspaloy fasteners should be considered. Below 700°C, Inconel X-750 outperforms Inconel 625 and all standard stainless steel grades in stress relaxation resistance – making it the preferred choice for gas turbine casing joints and high-temperature pressure vessel closures.

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  • Ahmedabad
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