What is the difference between Inconel 600 and Inconel X-750?

The main difference is that Inconel X-750 is a precipitation-hardened alloy, providing significantly higher tensile strength, creep resistance, and fatigue strength than Inconel 600. Inconel 600 is mainly selected for corrosion and oxidation resistance, while X-750 is preferred for high-temperature structural applications.

Is Inconel X-750 magnetic?

Inconel X-750 is generally non-magnetic in its annealed condition due to its high nickel content. However, slight magnetic properties may develop after cold working or specific heat-treatment processes.

Inconel X750 Fasteners – UNS N07750 High-Temperature Bolts, Nuts & Screws

Q: What is Inconel X750 material equivalent to?

Inconel X-750 is designated as UNS N07750 and Werkstoff Number 2.4669. It is manufactured to standards such as ASTM B166 and ASME SB166 and is also known by trade names including Pyromet X-750 and Nickelvac X-750.

Certified Manufacturer & Supplier | ASTM B637 | UNS N07750 | WNR 2.4669 | Sizes M1.2 to M160

Sizes In Stock M2 to M160 (Metric) | 3/16" to 2" (Imperial)

Strength Tensile Strength: Up to 1,267 MPa | Yield Strength: Up to 868 MPa

Service Temperature Up to 816°C (1500°F)

Standards ASTM B637 / ASME SB637 / ASME B18 / DIN / ISO

Documentation EN 10204 3.1 MTC Available

Export 50+ Countries | Same-Week Dispatch Available

Service Temperature: Up to 816°C (1500°F)

Inconel X750 fasteners are precision engineered joining components that are precision made from a precipitation hardened nickel-chromium superalloy (UNS N07750 / WNR 2.4669) that has an outstanding balance of tensile strength, oxidation resistance and creep resistance to 816°C (1,500°F). Inconel X750 bolts, nuts, screws and threaded rods do not lose their mechanical integrity or clamping force at elevated temperatures and will not lose clamping force when subjected to extreme thermal cycling and harsh corrosive environments — ideal for use in the aerospace, nuclear energy, marine and petrochemical sectors.

Unifit Fastener is the trusted manufacturer, stockist and global exporter of ASTM B637 Inconel X750 fasteners in metric size from M1.2 to M160 and imperial size from 3/16" to 2". All products are accompanied with EN 10204 3.1 material test certificates, and are completely traceable from raw material to the finished fastener. For standard hex bolts, B16.5 stud bolts and other custom-machined components, our technical staff is available to help you determine the best grade, condition of heat treatment and size to suit your application. Be sure to get a free quote if you need one.

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Table of Content

Inconel X750 Fasteners Specifications
Types Of Inconel X750 Fasteners

Alloy X750 Bolts
Inconel X750 Nuts 2.4669
Inconel Alloy X750 Washers
Nickel Alloy X750 Screws
Inconel X-750 Stud Bolts

Inconel X750 Chemical Composition
Inconel X750 Mechanical Properties
Inconel X750 Fastener Size Range
Inconel X750 Fasteners Equivalent Grades
Inconel X750 Fasteners Applications & Industries
Inconel X750 vs. Other Inconel Alloys
Manufacturing Process & Quality Assurance
Key Features & Benefits of Inconel X750 Fasteners
Inconel x750 Fasteners Price List
Check Our Related Products
Export Destinations For Inconel X750 Fasteners
Frequently Asked Questions

Inconel X750 Fasteners Specifications

Specification Category	Alloy X750 Fasteners Details
Material Grade	Inconel® Alloy X-750 / UNS N07750 / WNR 2.4669
Applicable Standards	ASTM B637, ASME SB637
Trade Names	Pyromet® X-750, Haynes® X-750, Nickelvac® X-750
Metric Sizes	M3 to M56
Imperial Sizes	3/16" to 2"
Length Range	3 mm to 200 mm
Density	8.28 g/cm³
Melting Range	1393°C – 1427°C
Maximum Service Temperature	Up to 816°C (1500°F)
Product Forms	Hex Bolts, Heavy Hex Bolts, Nuts, Screws, Stud Bolts, Threaded Rods, Washers
Head Styles	Hex Head, Square Head, T-Head, Hex Flange, Round Head, Flat Head
Drive Types	Torx, Cross Recess, Slot Drive, Hex Socket
Thread Configuration	Right-Hand Thread, Left-Hand Thread, Double-End Thread
Thread Series	Metric, UNC, UNF, BSW, BSF
Thread Pitch Options	Coarse Thread and Fine Thread
Point Styles	Cone Point, Cup Point, Half Dog Point, Full Dog Point, Gimlet Point, Chamfer End
Neck Types	Square Neck, Hex Neck, Knurled Neck, Oval Neck
Manufacturing Process	CNC Machining, Hot Forging, Cold Forging, Precision Thread Rolling
Surface Finishes	Self Colour, Black Oxide, Bright Zinc Plated (BZP), Hot-Dip Galvanized (HDG), Nickel Plated, Zinc-Nickel Coated
Special Coatings	Teflon Coating, Dacromet Coating, Chrome Plating, Anodized Finish
Testing Methods	PMI Testing, Mechanical Testing, Hardness Testing, Spectro Analysis, Pitting Resistance Testing, Flattening Test
Key Advantages	High Tensile Strength, Excellent Creep Resistance, Superior Oxidation Resistance, Excellent High-Temperature Performance
Industrial Applications	Aerospace Components, Gas Turbines, Power Generation, Food Processing Equipment, Pharmaceutical Plants, Petrochemical Industry
Export Markets	Oman, Qatar, UAE, Lebanon, Turkey, Malaysia and Worldwide

Types Of Inconel X750 Fasteners

Unifit Fastener manufactures and stocks Inconel X750 bolts, nuts, washers, screws, stud bolts and threaded rods to ASTM B637 / UNS N07750 in both metric and imperial sizes. All fastener types are available with EN 10204 3.1 material test certificates.

Alloy X750 Bolts in Stock

Nickel Alloy X750 Eye Bolts

UNS N07750 Flange Bolts

2.4669 Inconel X750 Hanger Bolts

2.4669 Inconel X750 Nuts in Stock

Nickel X750 Cap Nuts

Nickel X750 Hex Cap Nuts

Nickel X750 Acorn Cap Nuts

ASME SB 166 Castle Nuts

Inconel X750 Hex Castle Nuts

UNS N07750 Slotted Castle Nuts

Nickel Alloy X750 Coupling Nuts

Inconel X750 Long Coupling Nuts

2.4669 X750 Reducing Coupling Nuts

Inconel Alloy X750 Washers in Stock

Nickel X750 Flat Washers
DIN 2.4669 Fender Washers
UNS N07750 Square Washers
ASME B18.22.1 Plain Washers
Inconel X750 Spring Lock Washers
Alloy X750 Structural Washers

Nickel Alloy X750 Screws in Stock

X750 Inconel Eye Screws
ASME SB 166 Hex Lag Screws
2.4669 Inconel X750 Machine Screws
Inconel X750 Socket Head Cap Screws
UNS N07750 Pan Head Screws
Alloy X750 Self-Drilling Screws

Inconel X-750 Stud Bolts in Stock

ASME B16.5 Fully Threaded Stud Bolts
Inconel X750 Double-End Stud Bolts
UNS N07750 Tap-End Stud Bolts
2.4669 Alloy X750 Flange Stud Bolts
Inconel X750 B7 Threaded Rods

Inconel X750 Chemical Composition (ASTM B637 / UNS N07750)

The chemical composition of Inconel X750 is tightly controlled to ASTM B637 requirements to ensure consistent mechanical performance across all heat treatment conditions:

Ni	Cr	Fe	Ti	Al	Nb+Ta	Mn	Si	Cu	C	S	Co
≥70	14–17	5–9	2.25–2.75	0.40–1.0	0.70–1.20	≤1.0	≤0.50	≤0.50	≤0.08	≤0.01	≤1.0

All percentages shown as maximum (max) or ranges where applicable. Nickel content includes cobalt. Nb+Ta (Niobium + Tantalum) content ranges 0.70–1.20%.

Additional composition details per Dalloyed source: Silicon (Si) = 0.5% max | Aluminum (Al) = 0.4–1.0% | Carbon (C) = 0.08% max | Iron (Fe) = 5–9%.

Inconel X750 Mechanical Properties (Tensile & Hardness)

UNS / Condition	Heat Treatment	Tensile Strength	Yield Strength (0.2%)	Elongation / Hardness
ASTM B637 UNS N07750 Type 1	Solution + Stabilize + Precip. Harden	965 MPa (140 ksi)	620 MPa (90 ksi)	8% / 262–302 HB
ASTM B637 UNS N07750 Type 2	1800°F Solution + Precip. Harden	1170 MPa (170 ksi)	790 MPa (115 ksi)	18% / 302–363 HB
ASTM B637 UNS N07750 Type 3	2000°F Anneal + Precip. Harden	1103–1276 MPa max	689–896 MPa max	20% / 267–363 HB

Physical & Thermal Properties

Property	Value	Notes
Density	8.28 g/cm³ (0.299 lb/in³)
Melting Range	1393–1427°C (2540–2600°F)
Melting Point (Solidus/Liquidus)	1390°C / 1430°C
Heat Capacity	0.431 J/g·°C
Thermal Conductivity (at 70°F)	83 Btu/hr·sq ft/°F	Increases to 154 at 1400°F
Electrical Resistivity (at 70°F)	731 ohm·circ mil/ft
Tensile Strength	1267 MPa
Yield Strength	868 MPa	0.2% offset
Elongation	25%
Temperature Range	Up to 816°C (1500°F)	High stress applications

Inconel X750 Fastener Size Range

Fastener Type	Metric Sizes	Imperial Sizes	Standard
Screws	M1.2 to M48	1/4" to 2"	Per ASME B18.2.1
Bolts	M1.2 to M120	3/16" to 2"	Per DIN 931 / ASTM
Stud Bolts	M4 to M100	1/4" to 3"	Per ASME B16.5
Nuts	M2 to M80 (up to M160)	1/4" to 4"	Per ASME B18.2.2
Washers	M2 to M24	3/16" to 2"	Per ASME B18.22.1
Threaded Rod	M2 to M72	1/4" to 3"	Per ASTM F593
Length	3 to 200 mm	Per customer spec	Custom lengths available

Custom sizes up to M140 bolts and M160 nuts can be manufactured on request using CNC machining, hot forging, or cold forging processes. Length can be cut to specification from 3 mm up to 200 mm standard, with extended lengths available.

Inconel X750 Fasteners Equivalent Grades

Standard Category	Standard Code	Scope / Notes
Material Standard	ASTM B637 / ASME SB637	Bar, forgings & flash-welded rings
Plate / Sheet / Strip	ASTM B906 / ASME SB906	Plate and sheet forms
Pipe / Tube	ASTM B163 / ASME SB163	Seamless tube and pipe
UNS Designation	UNS N07750	North American standard
Werkstoff Nr.	WNR 2.4669	European / German standard
JIS Designation	NCF X-750	Japanese Industrial Standard
Head Markings	ASME B18.2.1 / DIN 931	Hex head bolt dimensions
Testing	ASTM E8 / ASTM A370	Tensile and hardness testing
Chemical Testing	ASTM E1019 / ASTM E1479	Elemental analysis
MTC / QC	EN 10204 3.1 / 3.2	Material Test Certificates

Equivalent Grade Cross-Reference

Alloy Name	UNS (USA)	Werkstoff Nr. (EU)	JIS (Japan)
Inconel X750	N07750	2.4669	NCF X-750
Trade Names	Pyromet X750 \| Haynes X750	—	—

Inconel X750 Fasteners Applications & Industries

Industry / Application	Typical Use Cases	Why Inconel X750?
Aerospace & Defence	Jet engine components, aircraft structures, gas turbines	Withstands sustained high-temp mechanical loads
Oil & Gas / Petrochemical	Subsea bolting, wellhead equipment, pipelines	Excellent resistance to H2S & chloride environments
Nuclear Energy	Reactor internals, pressure vessel bolting	Reliable under radiation and elevated temperature
Marine & Offshore	Seawater desalination, offshore platforms	Superior chloride corrosion resistance
Chemical Processing	Reaction vessels, heat exchangers, flanges	Resists oxidising and reducing acids
Automotive / Motorsport	Turbocharger fasteners, exhaust manifolds	Creep resistance under cyclic thermal loading
Power Generation	Steam turbine bolting, high-temp springs	Long service life at elevated temperatures
High-Temperature Springs	Springs operating above 600°C	Maintains elasticity under sustained stress

Inconel X750 vs. Other Inconel Alloys – Comparison

Property	Inconel X750	Inconel 718	Inconel 625	Inconel 600
Tensile Strength	1267 MPa	1380 MPa	760 MPa	550 MPa
Max Use Temp.	816°C (1500°F)	704°C (1300°F)	980°C (1796°F)	870°C (1600°F)
Density (g/cm³)	8.28	8.19	8.22	8.19
Corrosion Resistance	Excellent	Excellent	Outstanding	Good
Precipitation Hardening	Yes	Yes	No	No
Creep Resistance	Very High	High	High	Moderate
Cost Relative	Moderate	High	Higher	Lower
Key Alloys (ASTM)	B637	B637	B443	B168

Summary: Inconel X750 is the optimal alloy when precipitation hardening is required for bolts and springs operating above 600°C under sustained load, offering a better strength-to-cost ratio than Inconel 718 for most industrial bolting applications.

Manufacturing Process & Quality Assurance

Every Inconel X750 fastener manufactured by Unifit Fastener follows a rigorous, traceable production process aligned with ASTM B637 and customer-specific quality plans:

Manufacturing Processes:

Hot Forging – for bolts and heavy-section fasteners requiring maximum grain integrity
Cold Forging – for precision-tolerance screws and nuts up to M48
CNC Machining – for custom profiles, flange bolts, and specialty fasteners
Thread Rolling – for superior thread root fatigue resistance
Heat Treatment – age hardening, solution anneal, and precipitation treatment per ASTM B637

Surface Finishing Options:

Self-colour (as-manufactured)
Black Oxide
Nickel Plating / Zinc-Nickel Plating
Bright Zinc Plated (BZP)
Teflon Coating | Chrome Plating | Mirror Buffed

Testing & Inspection:

Mechanical Testing: Tensile, Yield, Hardness, Elongation (ASTM E8 / A370)
Chemical Analysis: PMI (Positive Material Identification), Spectro Analysis
Non-Destructive Testing: X-Ray, Dye Penetrant (PT), Magnetic Particle (MT)
Impact Testing, Flaring Test, Pitting Resistance Test, Flattening Test
Torque Testing, Hydrogen Embrittlement Testing

Key Features & Benefits of Inconel X750 Fasteners

Feature	Benefit to Your Application
Precipitation hardenable	Achieves tensile strengths up to 1267 MPa through controlled ageing — 3× stronger than 316 SS
Temperature resistance to 816°C	Maintains bolt clamping load without creep or relaxation where carbon steel fails
High nickel-chromium base (≥70% Ni)	Resists chloride stress corrosion cracking, seawater attack, and oxidising acids
Titanium + Aluminium additions	Form the γ' precipitate phase that provides the alloy's exceptional strength at temperature
Low creep rate	Critical for nuclear and turbine bolting where dimensional stability over decades is essential
Spring-quality elasticity	The only common Inconel alloy used for high-temperature springs — unique in the superalloy family
Full ASTM B637 certification	Ensures compliance with pressure equipment, nuclear, and aerospace procurement codes

Inconel x750 Fasteners Price List (ASTM B637 UNS N07750)

Note: Prices are indicative and vary based on order quantity, size, heat treatment condition, and surface finish. Contact Unifit Fastener for a firm quotation.

Product	Size Range	Price (USD)	Price (INR)	AED
Inconel X750 Hex Bolt	M5–M100	$1.00	₹75.00	3.67 AED
Inconel X750 Stud Bolt	M6–M125	$1.00	₹75.00	3.67 AED
Inconel X750 Hex Nut	M2–M120	$0.10	₹7.50	0.37 AED
Inconel X750 Threaded Rod	M2–M72	$0.50	₹37.50	1.84 AED
Nickel Alloy X750 Head Screw	M8–M48	$0.01–0.10	₹0.75–7.50	—
ASME SB166 Flat Washer	M24	$5.00	₹375.00	18.35 AED
Inconel X750 U-Bolt	M6–M36	$10.00	₹750.00	36.70 AED

Check Our Related Products

Frequently Asked Questions (FAQ Schema-Ready)

Inconel X-750 is primarily used in high-temperature and high-stress applications where excellent corrosion resistance and mechanical strength are required. Common applications include aerospace components, gas turbine engines, nuclear reactors, heat-treatment equipment, and industrial fasteners.

Inconel X-750 is designated as UNS N07750 and Werkstoff Nr. 2.4669. It is manufactured to standards such as ASTM B166 and ASME SB166 and is also known by trade names including Pyromet® X-750 and Nickelvac® X-750.

The main difference is that Inconel X-750 is a precipitation-hardened alloy, offering significantly higher tensile strength and creep resistance than Inconel 600. While Inconel 600 is valued for corrosion and oxidation resistance, X-750 is preferred for demanding high-temperature structural applications.

Inconel X-750 is generally considered non-magnetic in its annealed condition due to its nickel-rich composition. However, slight magnetic permeability may develop after cold working or certain heat-treatment processes.