What is the temperature limit of Inconel bolts?

Inconel bolts can perform reliably from cryogenic temperatures up to 2200°F (1204°C), depending on the grade. Inconel 601 offers continuous service up to 2200°F, while Inconel 718 maintains excellent creep-rupture strength up to 1300°F (704°C), making it suitable for high-stress applications.

What is the difference between Inconel 625 and Inconel 718 bolts?

Inconel 625 bolts provide exceptional corrosion resistance, especially in seawater and acidic environments, along with excellent weldability. Inconel 718 bolts are precipitation-hardened and offer significantly higher tensile strength, making them ideal for high-stress applications such as aerospace structures, gas turbines, and nuclear components where mechanical strength is critical.

What is the price of Inconel bolts in India?

The price of Inconel bolts in India typically ranges from ₹150 to ₹800 per piece for standard sizes, while bulk material pricing may range from ₹3,000 to ₹3,500 per kilogram. Prices vary depending on grade, size, quantity, surface finish, and prevailing nickel market rates. Contact Unifit Fastener for the latest quotation based on your requirements.

Which Inconel bolt grade is best for seawater applications?

Inconel 625 (UNS N06625) is widely considered the best grade for seawater applications. Its high molybdenum and niobium content provide outstanding resistance to pitting corrosion, crevice corrosion, and erosion-corrosion in offshore and marine environments. It is also compliant with NACE MR0175-3 requirements for sour service applications.

Can Inconel bolts be custom manufactured?

Yes. Unifit Fastener manufactures custom Inconel bolts and fasteners according to customer drawings, specifications, and certification requirements. Custom options include non-standard head designs, UNC, UNF, UNEF, Metric, BSW and BSF thread forms, special coatings, and compliance with aerospace, nuclear, and other industry-specific standards.

Inconel Bolts — High-Strength Nickel Alloy Fasteners for Extreme Environments

ISO-Certified Manufacturer & Supplier | ASTM/ASME Compliant | Inconel 600, 601, 625, 686, 718, 725 & X750

Size Range M3 to M56 | 3/16" to 2" | Custom sizes available

Temperature Cryogenic to 2200°F (1204°C)

Grades Inconel 600, 601, 625, 686, 718, 725, X750

Industries Aerospace, oil & gas, marine, nuclear, chemical

Documentation MTC, traceability and third-party inspection available

Supply Standard hex bolts and custom drawing-based fasteners

Inconel Bolts Manufacturer & Suppliers in India

Designed from a high quality family of nickel-chromium-molybdenum (Ni-Cr-Mo) superalloys, Inconel bolts are engineered to perform in the most extreme industrial applications. We produce and sell all the major grades of Inconel bolts, such as Inconel 600, 601, 625, 718, 725, and X750, to ASTM, ASME, AMS, DIN and ISO international standards at Unifit Fastener.

With its numerous properties such as: resistance to temperatures up to 2200°F / 1204°C, corrosion resistance in acidic and chlorinated surroundings, and high tensile strength to resist harsh mechanical loads, Inconel bolts are specified when standard stainless steel and carbon steel fasteners cannot meet the temperature, pressure, or corrosion requirements of the service environment. Our Inconel bolts serve aerospace turbine assemblies, subsea wellhead connections, chemical reactor flanges, nuclear steam generator internals, and offshore platform structures, you can expect our bolts to have a certified material traceability, extensive testing, and be dispatched globally.

All bolts coming out of our manufacturing plant are ISO 9001:2015 certified and subject to third-party inspection to guarantee that each bolt meets or exceeds the mechanical and chemical requirements. Whether you're looking for standard hex bolts or custom solutions, Unifit Fastener is your go-to Inconel bolt manufacturer in India.

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Table of Content

What are Inconel Bolts?
Specification of Inconel Bolts
Types of Inconel Bolts and Screw
Inconel Bolt Grades
Chemical Composition of Inconel Bolts
Mechanical Properties of Inconel Bolts
Inconel Bolts Price
Inconel Bolts Sizes
Applications & Industries Served
Inconel Bolts vs Other Alloys
Our Manufacturing Process
Certifications, Standards & Quality Compliance
Frequently Asked Questions

What are Inconel Bolts?

Inconel is the trade name for a superalloy series developed by Special Metals Corporation. These nickel-chromium alloys are defined by their outstanding resistance to oxidation and corrosion, even at elevated temperatures where stainless steel and carbon steel fasteners would fail. The high nickel and chromium content creates a protective oxide layer on the bolt surface, providing passive corrosion resistance in neutral, oxidizing, and mildly reducing environments.

Inconel bolts are available in various head styles, thread configurations, and surface finish options to suit diverse engineering requirements:

Hex Head Bolts / Heavy Hex Bolts
U-Bolts and J-Bolts
Shoulder Bolts and Socket Head Cap Screws
Eye Bolts, T-Bolts, and Foundation Bolts
Flange Bolts and Stud Bolts
Custom profiles per engineering drawings

Specification of Inconel Bolts

Property	Details
Standard	ASTM F2281, ASTM B166, ASTM B637, ASME SB 166
Dimensions	DIN, ASTM, BS, ISO and all International Standards
Size Range	M3 to M56 \| 3/16" to 2" \| Custom Sizes Available
Length	3 mm to 200 mm, custom on request
Grades / Alloys	Inconel 600, 601, 625, 686, 718, 725, X750
Hardness Treatment	Annealing, Stress Relieving, Case Hardening, Quenching & Tempering
Bolt Types	Hex Bolt, U-Bolt, Eye Bolt, Flange Bolt, Shoulder Bolt, J-Bolt, T-Head Bolt, Foundation Bolt
Temperature Range	Cryogenic to 2200°F (1204°C)

Types of Inconel Bolts and Screw

Incone Hex Screw

Inconel Coach Screw

Inconel Eye Bolt

Inconel Flange Bolt

Inconel Fully Threaded Screws

Inconel Square Head Bolt

Inconel T Bolt, J Bolt & L Bolt

Inconel U Bolt

Inconel Bolt Grades

Inconel 600 Bolts Inconel 601 Bolts Inconel 625 Bolts Inconel 718 Bolts Inconel X-750 Bolts

Chemical Composition of Inconel Bolts

Grade	UNS No.	Ni %	Cr %	Fe %	Mo %	Al %	Key Std.
Inconel 600	N06600	72 min	14-17	6-10	-	-	ASTM B166
Inconel 601	N06601	58-63	21-25	Bal.	-	1.0-1.7	ASTM B167
Inconel 625	N06625	58 min	20-23	5 max	8-10	0.4 max	ASTM F468
Inconel 718	N07718	50-55	17-21	Bal.	2.8-3.3	0.2-0.8	AMS 5662/63
Inconel 686	N06686	57 min	19-23	5 max	15-17	-	ASTM B462
Inconel X750	N07750	70 min	14-17	5-9	-	0.4-1.0	AMS 5667

Mechanical Properties of Inconel Bolts

Grade	UTS (MPa)	YS 0.2% (MPa)	Elongation %	Specification
Inconel 600	655	310	40	AMS 5540
Inconel 601	760	380	35	AMS 5715
Inconel 625	930	517	42.5	AMS 5666
Inconel 718 (AMS 5662)	1275	1034	12	AMS 5663
Inconel X750	1250	1000	20	AMS 5667

Inconel Bolts Price (Indicative)

Prices vary based on grade, size, thread type, quantity, certification requirements and current nickel market prices.

Bolt Size	Length Range	Approx. Price (USD/Piece)	Approx. Price (INR/Piece)
M6	20-100 mm	$2 - $8	₹170 - ₹680
M8	20-150 mm	$3 - $12	₹250 - ₹1,020
M10	25-200 mm	$5 - $18	₹425 - ₹1,530
M12	30-250 mm	$8 - $30	₹680 - ₹2,550
M16	40-300 mm	$15 - $55	₹1,275 - ₹4,675
M20	50-350 mm	$25 - $90	₹2,125 - ₹7,650
M24	60-400 mm	$40 - $150	₹3,400 - ₹12,750
M30	80-500 mm	$80 - $300	₹6,800 - ₹25,500

Inconel Bolt Price Per Kg

Grade	Price Range (USD/Kg)	Price Range (INR/Kg)
Inconel 600	$35 - $55	₹3,000 - ₹4,700
Inconel 625	$45 - $75	₹3,800 - ₹6,400
Inconel 718	$55 - $95	₹4,700 - ₹8,100
Inconel X-750	$60 - $100	₹5,100 - ₹8,500

Inconel Bolts Sizes

Metric Sizes

Diameter	Thread Pitch (Coarse)	Common Lengths
M5	0.8 mm	10-100 mm
M6	1.0 mm	12-120 mm
M8	1.25 mm	16-150 mm
M10	1.5 mm	20-200 mm
M12	1.75 mm	25-250 mm
M16	2.0 mm	35-300 mm
M20	2.5 mm	45-350 mm
M24	3.0 mm	60-400 mm

Applications & Industries Served

The unique combination of corrosion resistance, high-temperature stability, and mechanical strength makes Inconel bolts an essential fastening solution across seven major industrial sectors:

Industry	Typical Applications
Aerospace & Defence	Jet engines, turbine blades, exhaust manifolds, rocket motor components, spacecraft hardware
Oil & Gas	Wellhead equipment, subsea pipelines, drilling rigs, pressure vessels, sour gas service
Chemical Processing	Reactors, heat exchangers, piping flanges, valve bodies exposed to corrosive acids
Marine	Offshore platforms, shipbuilding structures, seawater desalination, propeller shafts
Power Generation	Gas turbines, steam generators, nuclear reactor vessels, boiler components, fuel rods
Electronics	Precision semiconductor connectors, high-frequency components, stable mounting hardware
Pollution Control	Flue gas desulphurisation scrubbers, waste incineration plants, industrial filtration

Inconel Bolts vs Other Alloys — Performance Comparison

Understanding how Inconel bolts compare against other commonly used fastener materials helps engineers make the correct specification decision for mission-critical applications:

Property	Inconel 625	Inconel 718	SS 316L	Carbon Steel
Max Temp (°F)	1800	1300	1500	700
Tensile Strength	930 MPa	1275 MPa	515 MPa	400 MPa
Seawater Corrosion	Excellent	Very Good	Moderate	Poor
Acid Resistance	Outstanding	Very Good	Fair	Poor
Creep Resistance	High	Very High	Moderate	Low
Weldability	Excellent	Good	Good	Excellent

Note: Inconel grades consistently outperform standard stainless steel and carbon steel fasteners in corrosive, high-temperature, and high-stress service conditions, justifying their higher material cost in critical applications.

Our Manufacturing Process — 8-Stage Quality Assurance

Every Inconel bolt manufactured at Unifit Fastener undergoes a rigorous 8-stage production process to ensure dimensional accuracy, mechanical performance, and surface integrity:

Stage	Quality Assurance Process
Stage 1 — Raw Material Selection	Premium certified Inconel alloy bar stock procured from accredited mills with Mill Test Reports (MTR) for full material traceability.
Stage 2 — Cutting	CNC cutting to precise blank lengths with controlled tolerances to eliminate material waste and ensure dimensional consistency.
Stage 3 — Hot / Cold Forging	Bolt heads are formed by hot or cold forging to achieve the required grain flow structure, superior strength, and dimensional accuracy.
Stage 4 — Thread Rolling	Threads are rolled, not cut, to improve tensile strength, fatigue resistance, and surface finish quality with uniform thread pitch.
Stage 5 — Heat Treatment	Controlled annealing, solution treating, age hardening, or stress relieving as per grade-specific AMS/ASTM requirements to achieve target mechanical properties.
Stage 6 — Surface Treatment	Passivation, galvanization, PTFE coating, Dacromet, Geomet, or Electroless Nickel plating applied as per customer specification.
Stage 7 — Inspection & Testing	100% dimensional inspection; tensile testing, hardness testing, positive material identification (PMI), radiographic testing, and IGC testing conducted per applicable standards.
Stage 8 — Packaging & Dispatch	Bolts segregated by grade, size, and heat number; carefully packaged in carton, pallet, or bulk formats with full documentation and dispatched globally.

Certifications, Standards & Quality Compliance

Unifit Fastener maintains the highest levels of quality compliance across all internationally recognized fastener and material standards:

Standard Body	Applicable Standards
ASTM / ASME	F2281, B166, B167, B446, B637, F468, F467, SB 166, SB 167
AMS (Aerospace)	5540, 5662, 5663, 5666, 5715, 5870, 5962, 5596, 5667-5671
DIN / EN / ISO	DIN 933/931/970, EN 2.4816, EN 2.4851, EN 2.4856, ISO 4032, JIS standards
NACE	MR0175-3 for Inconel 625 in sour service applications
Quality Systems	ISO 9001:2015 certified; EN 10204/3.1B, Third Party Inspection, Raw Material Certificate

Frequently Asked Questions

Inconel bolts are fasteners manufactured from nickel-chromium-molybdenum superalloys (Inconel family). They are used in high-temperature, high-pressure, and corrosive environments where standard stainless steel or carbon steel fasteners fail. Industries such as aerospace, oil & gas, chemical processing, and marine rely on Inconel bolts for their superior oxidation resistance, tensile strength, and service longevity.

Inconel bolts can perform reliably from cryogenic temperatures up to 2200°F (1204°C) depending on the grade. Inconel 601 is rated for the highest continuous use temperature at 2200°F, while Inconel 718 maintains creep-rupture strength up to 1300°F (704°C) and is ideal for high-stress applications in that range.

Inconel 625 bolts offer outstanding corrosion resistance, especially in seawater and acidic environments, along with good weldability and excellent flexibility in corrosive service. Inconel 718 bolts are precipitation-hardened and provide approximately twice the tensile strength of 625, making them preferred for high-stress structural applications like gas turbines, aerospace structures, and nuclear components where strength is the primary concern.

Inconel bolt prices in India typically range from ₹150 to ₹800 per piece for standard grades, or ₹3,000 to ₹3,500 per kg for bulk orders. Pricing varies based on grade, size, quantity, surface treatment, and current nickel market rates. Contact Unifit Fastener for a competitive customized quotation.

Inconel 625 (UNS N06625) is the most recommended grade for seawater service. Its high molybdenum and niobium content provides exceptional resistance to pitting, crevice corrosion, and erosion-corrosion in offshore and marine environments. It is also NACE MR0175-3 compliant for sour service applications.

Yes. Unifit Fastener specializes in custom Inconel fastener manufacturing to client-supplied drawings, specifications, and certifications. We can produce non-standard head types, thread configurations (UNC, UNF, UNEF, Metric, BSW, BSF), special surface coatings, and fasteners for specific industry certifications including ITAR, aerospace, and nuclear requirements.