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Inconel X-750 Washers Manufacturer & Exporter in India

Explore Inconel X-750 Washers 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 Washers?

Inconel X-750 washers are precipitation-hardened nickel-chromium alloy fastener components manufactured from UNS N07750 bar or plate stock conforming to ASTM B637. The alloy achieves its exceptional strength through gamma-prime precipitation hardening via aluminum (0.4-1.0%) and titanium (2.25-2.75%), delivering tensile strengths exceeding 1100 MPa in the age-hardened condition.

With a service temperature range extending to 870°C and outstanding resistance to relaxation under sustained load, Inconel X-750 washers are specified for gas turbine bolted assemblies, nuclear reactor internals, and high-temperature pressure vessel closures where standard stainless steel washers would creep and lose clamping force. These washers conform to NACE MR0175 hardness limits and are widely used across aerospace, power generation, and petrochemical industries.

Quick Specifications

MaterialInconel X-750
UNS NumberN07750
DIN Number2.4669
Material StandardASTM B637
Washer Standard (Metric)DIN 125 / DIN 9021 / ISO 7089
Washer Standard (Inch)ASME B18.22.1
Washer TypesFlat / Spring / Conical / Fender
Inner 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 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 Nuts, Inconel X-750 Screws, 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 Nuts
Inconel X-750 Screws
Inconel X-750 Studs
Inconel X-750 Threaded Rods

Technical Data

Inconel X-750 Washers Dimensions, Sizes & Thread Standards

Inconel X-750 Washers are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 125 (flat washers) / DIN 9021 (large OD) / ISO 7089 / ISO 7090. Custom OD and thickness available. Inch dimensions per ASME B18.22.1. All Inconel X-750 washers dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Flat Washer Dimensions - Metric (DIN 125 / ISO 7089)

Bolt Size (M)Inner Dia (mm)Outer Dia (mm)Thickness (mm)Large OD (DIN 9021)
M66.4121.618
M88.4161.624
M1010.5202.030
M1213.0242.537
M1617.0303.050
M2021.0373.060
M2425.0444.072
M3031.0564.092
M3637.0665.0110
M4243.0787.0130
M4850.0928.0150
M5658.01059.0175
M6466.01159.0200
M7274.012510.0220
M8082.014012.0250
M100104.017514.0300

Dimensional & Material Standards

StandardCoversSystem
DIN 125Flat washers, normal seriesMetric
DIN 9021Flat washers, large OD seriesMetric
ISO 7089Plain washers, normal seriesMetric
ISO 7090Plain washers, chamferedMetric
ASME B18.22.1Plain washers, inch seriesInch
ASME B18.21.1Lock washers, inch seriesInch
MSS SP-75High-pressure washer setsInch
Material StandardRequirement
ASTM B637Bar/rod/forgings - UNS N07750
AMS 5542Sheet, strip, plate - X-750
AMS 5598Seamless tubing - X-750
NACE MR0175Sour service hardness =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Inconel X-750 Chemical Composition

Inconel X-750 Washers 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)70.0% min
Chromium (Cr)14.0-17.0%
Iron (Fe)5.0-9.0%
Titanium (Ti)2.25-2.75%
Aluminum (Al)0.40-1.00%
Niobium + Tantalum (Nb+Ta)0.70-1.20%
Manganese (Mn)1.00% max
Silicon (Si)0.50% max
Copper (Cu)0.50% max
Carbon (C)0.08% max
Cobalt (Co)1.00% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Inconel X-750 Alloy Composition Matters for Washers

Ti (2.25–2.75%) + Al (0.40–1.00%) — Precipitation Hardening
Titanium and aluminum combine with nickel to form the gamma-prime (Ni3(Ti,Al)) precipitate phase during aging heat treatment. This mechanism raises yield strength to 793 MPa minimum, preventing washer deformation and embedment relaxation under sustained bolt load at elevated temperatures.
Cr (14–17%) — Oxidation and Corrosion Resistance
Chromium content provides a stable Cr2O3 passive film that resists oxidation up to 870°C. Inconel X-750 washers maintain their bearing surface integrity in gas turbine hot sections and furnace hardware where stainless steel washers would scale and lose dimensional accuracy.
Nb+Ta (0.70–1.20%) — Grain Boundary Stability
Niobium and tantalum additions stabilize grain boundaries against carbide precipitation during service at elevated temperatures, preventing intergranular attack and maintaining ductility in washers subjected to thermal cycling in nuclear and aerospace applications.

Fastener Performance

Inconel X-750 Washers Mechanical Properties & Torque & Proof Load Reference

The table below lists mechanical properties and proof load reference for Inconel X-750 Washers per ASTM. Inconel X-750 washers achieve 760 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Washer Bearing Load Reference - Metric Flat Washers (DIN 125)

Washer SizeInner Dia (mm)Outer Dia (mm)Thickness (mm)Max Bearing Load (kN)
M1213.0242.548
M1617.0303.095
M2021.0373.0148
M2425.0444.0215
M3031.0564.0340
M3637.0665.0490
M4243.0787.0680
M4850.0928.0890
?? Installation note: Use nickel-based anti-seize on mating bolt threads. Bearing load values based on aged condition (1100 MPa UTS). Verify flange face hardness to prevent washer embedment on soft substrates.

Industry Applications

Inconel X-750 Washers Applications — Industries & End Uses

Inconel X-750 Washers 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 washers are standard hardware in gas turbine compressor and turbine disc bolted assemblies, combustor casing flanges, and thrust reverser attachment points. The combination of high yield strength at temperature and resistance to stress relaxation ensures sustained clamping force through thermal cycles from cold soak to 870°C. Conforms to AMS 5542 and AMS 5598.
Specified for reactor pressure vessel (RPV) closure stud washer sets, control rod drive mechanism (CRDM) flanges, and core barrel support assemblies in PWR and BWR reactors. Inconel X-750 washers meet ASME Section III requirements and are approved under 10 CFR 50 Appendix B quality assurance programs for nuclear safety-related applications.
Flange washer sets for ASME Section VIII pressure vessels operating above 540°C, TEMA Class R heat exchanger channel cover assemblies, and reformer furnace tube sheet connections in hydrogen and ammonia synthesis plants where creep relaxation of standard alloy steel washers causes flange leakage.
Inconel X-750 washers are used in high-pressure high-temperature (HPHT) wellhead flange assemblies, subsurface safety valve (SSSV) connections, and downhole completion tool hardware where combined elevated temperature and H2S sour service require both precipitation-hardened strength and NACE MR0175 compliance.

Inconel X-750 Washers Standards & International Certifications

Inconel X-750 Washers 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 125A DIN 126 DIN 127 DIN 128 ISO 7089 ISO 7090 ASME B18.21.1 EN ISO 7089 IS 5372 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Inconel X-750 Washers 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 washers selection and pricing.
Inconel X-750 flat washers are manufactured to DIN 125 (normal series), DIN 9021 (large OD series), ISO 7089, and ISO 7090 (chamfered) for metric applications. Inch series washers are produced per ASME B18.22.1 (plain washers) and ASME B18.21.1 (lock washers). Custom OD, bore, and thickness combinations are available for aerospace and nuclear applications with full dimensional inspection reports and EN 10204 3.1 MTC.
Inconel X-750 washers are available in three heat treatment conditions depending on the application. Solution annealed (SA) condition provides maximum corrosion resistance and formability. Equalized and aged (EA) condition – 885°C/24h + 704°C/20h – delivers the highest strength for gas turbine and nuclear applications. Single aged (STA) condition is used where intermediate strength and toughness are required. The condition must be specified at order placement as it affects mechanical properties and hardness certification.
Yes – Inconel X-750 is one of the few alloys approved for ASME Section III nuclear safety-related fastener applications. Washers are supplied with full material traceability, CMTR documentation, and hardness survey per ASME NQA-1 quality assurance requirements. The alloy’s resistance to stress relaxation and irradiation embrittlement makes it the preferred choice for reactor pressure vessel closure hardware and core internal bolted assemblies in both PWR and BWR designs.
Yes – Inconel X-750 washers are listed in NACE MR0175 / ISO 15156-3 for sour service applications when supplied in the annealed or equalized-and-aged condition with hardness not exceeding 35 HRC. For HPHT wellhead applications, a hardness survey is performed on each washer lot and documented on the MTC. Washers intended for sour service must be ordered with explicit NACE compliance notation to ensure correct heat treatment and hardness verification.

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