Inconel Fasteners

Unifit Fastener is an ISO 9001:2015 certified Inconel fasteners manufacturer in India, producing Inconel bolts, nuts, stud bolts, washers, screws and threaded rods in grades 600, 601, 625, 718 and X-750. Sizes run from M3 to M100 and 1/8" to 4", in lengths to 5,000 mm, threaded to ASME B1.1 Class 2A/3A or ISO metric 6g. Every batch ships with an EN 10204 3.1 mill test certificate and heat-number traceability, with third-party inspection available on request. Supplied to refinery, gas turbine, offshore and aerospace subcontract buyers across India, the GCC, Europe and North America.

Inconel Fasteners Manufacturer & Supplier in India

Inconel fasteners are load-bearing components machined or cold-forged from nickel-chromium superalloys. The nickel matrix resists chloride stress-corrosion cracking that fails 316 stainless; the chromium content builds a stable oxide film that survives cyclic heating where carbon steel scales and loses section. In practical terms, an Inconel fastener is specified when one of four things is true: the joint runs above roughly 550°C, the medium contains chlorides or reducing acids, the assembly is subject to thermal cycling that would relax a lower-alloy bolt, or a single fastener failure carries unacceptable consequence. Service limits are grade-specific — the selection table below maps each grade to its working envelope.

Unifit runs cold forging for sizes to M24 and CNC turning with thread rolling above that, so thread grain flow stays continuous rather than cut — which is what holds fatigue life in a bolt that will see thermal cycling. Age-hardenable grades (718, X-750) are solution-treated and precipitation-hardened in-house to AMS 5662 or AMS 5667 as specified. Standard portfolio covers hex bolts, heavy hex bolts, socket head cap screws, stud bolts, threaded rods, hex nuts, heavy hex nuts, nyloc nuts, flat washers, spring washers and dowel pins, plus drawing-to-part custom fasteners against customer specification.

With over two decades of manufacturing expertise, Unifit Fastener serves global procurement teams in aerospace, oil & gas, chemical processing, nuclear energy, and marine engineering — delivering on tight tolerances, complex specifications, and competitive lead times.

Need Alloy 625? View Inconel 625 Fasteners (UNS N06625)

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Complete Range of Inconel Alloy Fasteners

We manufacture a comprehensive selection of Inconel fastener types to meet diverse mechanical, structural, and industrial bolting requirements. All product types are available in grades 600, 601, 625, 718, and X-750.

Inconel Bolts

Hex bolts, socket head bolts, eye bolts, flange bolts, J-bolts, U-bolts, and anchor bolts for high-load applications.

Inconel Nuts

Hex nuts, heavy hex nuts, square nuts, coupling nuts, jam nuts, dome nuts, nylock nuts, and wing nuts.

Inconel Stud Bolts

Fully threaded, tap-end, and double-end studs for high-strength bolting in flanged pipe assemblies and pressure vessels.

Inconel Washers

Flat washers, spring lock washers, ogee washers, self-locking washers, and fender washers for load distribution.

Inconel Screws

Hex cap screws, socket cap screws, button head screws, machine screws, set screws, and self-drilling screws.

Threaded Rods

Right and left-hand threaded rods in cold drawn, polished, and mill finish. Heat-treated options available.

Dowel Pins & Shoulder Bolts

Precision dowel pins for alignment and shoulder bolts for high-reliability assemblies requiring controlled shank dimensions.

Custom Fasteners

Engineered-to-specification fasteners manufactured per client drawings for specialized critical applications.

Inconel Grades Comparison

Grade UNS Number Composition Highlights Max Temp (°C) Key Applications Quick Link
Inconel 600 N06600 High Nickel, Chromium 1095°C Chemical processing, furnace components, food industry Inconel 600 Fasteners
Inconel 601 N06601 Added Aluminum for oxidation resistance 1250°C Heat-treating equipment, gas-turbine components Inconel 601 Fasteners
Inconel 625 N06625 Nickel-Chromium-Moly-Niobium 980°C Most Popular: Subsea, marine hardware, chemical plants Inconel 625 Fasteners
Inconel 718 N07718 Precipitation Hardened (Fe-Nb-Mo) 700°C Aerospace turbines, high-strength cryogenic tanks Inconel 718 Fastener
Inconel X-750 N07750 Age-hardenable (Al-Ti added) 815°C High-temperature springs, gas turbines, nuclear reactors Inconel X-750 Fasteners

Types of Inconel Fasteners We Supply

Inconel Bolts

Inconel Nuts

Inconel Stud Bolt

Inconel Washers

Inconel Screw

Technical Data

Product Range Matrix of Inconel Fasteners

Product TypeAvailable GradesSize RangeStandardsCommon Uses
Hex Bolts & Heavy Hex600, 601, 625, 718M6 – M100 ASME B18.2.1, DIN 931, DIN 933Structural assemblies, engine mounts, heavy machinery
Socket Head Cap Screws625, 718, X-750M3 – M48 ASME B18.3, DIN 912Precision aerospace parts, high-pressure valves
Stud Bolts (Full/Double End)600, 625, 718M10 – M150 ASME B16.5, ASTM A193/A194Flange connections in high-temp/high-pressure piping
Hex & Lock Nuts600, 601, 625, 718, X-750M3 – M150 ASTM A194, DIN 934, DIN 985Securing stud bolts and machine bolts in corrosive environments
Washers (Flat & Spring)625, 718, X-750M3 – M100 DIN 125, DIN 127, ASME B18.22.1Load distribution and vibration resistance in gas turbines
Threaded Rods600, 625, 7181m – 3m ASME B18.31.2, DIN 975/976Hanging supports in chemical tanks, custom anchoring
Machine Screws600, 625M1.6 – M10 ASME B18.6.3, DIN 7985Small electronic housing in marine/medical settings

Inconel Grades Comparison

GradeUNS NumberComposition HighlightsMax Temp (°C)Key ApplicationsQuick Link
Inconel 600N06600High Nickel, Chromium1095°CChemical processing, furnace components, food industryInconel 600 Fasteners
Inconel 601N06601Added Aluminum for oxidation resistance1250°CHeat-treating equipment, gas-turbine componentsInconel 601 Fasteners
Inconel 625N06625Nickel-Chromium-Moly-Niobium980°CMost Popular: Subsea, marine hardware, chemical plantsInconel 625 Fasteners
Inconel 718N07718Precipitation Hardened (Fe-Nb-Mo)700°CAerospace turbines, high-strength cryogenic tanksInconel 718 Fastener
Inconel X-750N07750Age-hardenable (Al-Ti added)815°CHigh-temperature springs, gas turbines, nuclear reactorsInconel X-750 Fasteners

Specifications & Standards of Inconel Fasteners

Manufacturing StandardsASTM / ASME SB160, SB164, SB425, SB166, SB446, SB472 & SB574
Diameter RangeMetric sizes from M10 to M100
Available LengthSupplied in custom lengths up to 1000 mm
Alloy Grades OfferedInconel 600 (UNS N06600), Inconel 601 (UNS N06601), Inconel 625 (UNS N06625), Incoloy 800 (UNS N08800), Incoloy 800H/HT (UNS N08810), Incoloy 825 (UNS N08825)
Compliance StandardsManufactured as per IS, BS & ASTM specifications
Product RangeHex Bolts, Heavy Hex Nuts, Stud Bolts, Threaded Bars, Eye Bolts, Anchor Bolts, Socket Head Screws, Cotter Pins, Industrial Washers, Foundation Fasteners, Precision Fasteners & related components

Standards for Inconel Fasteners

GradeUNSASTM / ASMEDIN / W.Nr.JISEN / ISO Equivalent
Inconel 600N06600SB-166 / B1662.4816NCF 600NiCr15Fe
Inconel 601N06601SB-166 / B1662.4851NCF 601NiCr23Fe
Inconel 625N06625SB-446 / B4462.4856NCF 625NiCr22Mo9Nb
Inconel 718N07718SB-637 / B6372.4668NCF 718NiCr19Fe19Nb5Mo3
Inconel X-750N07750SB-637 / B6372.4669
Incoloy 800N08800SB-408 / B4081.4876NCF 800X10NiCrAlTi32-21
Incoloy 825N08825SB-425 / B4252.4858NCF 825NiCr21Mo

Stud Bolt Size & Thread Pitch Chart

Metric SizeLength Range (mm)Thread PitchCommon Pressure Class
M620 – 1001.0Class 150
M825 – 1501.25Class 150–300
M1030 – 2001.5Class 300
M1240 – 2501.75Class 300–600
M1650 – 3002.0Class 600
M2060 – 3502.5Class 900
M2480 – 4003.0Class 1500
M30100 – 5003.5Class 2500

Chemical Composition of Major Inconel Grades

Understanding the elemental makeup of each Inconel grade helps engineers specify the right fastener for the service environment. The nickel-chromium matrix provides the base corrosion resistance, while secondary elements like molybdenum, niobium, and titanium govern strength and thermal stability.

ElementInconel 600Inconel 625Inconel 718Inconel X-750
Nickel (Ni)72.0 min58.0 min50.0–55.070.0 min
Chromium (Cr)14.0–17.020.0–23.017.0–21.014.0–17.0
Iron (Fe)6.0–10.05.0 maxBalance5.0–9.0
Molybdenum (Mo)8.0–10.02.8–3.3
Niobium (Nb + Ta)3.15–4.154.75–5.500.70–1.20
Titanium (Ti)0.40 max0.65–1.152.25–2.75
Aluminum (Al)0.40 max0.20–0.800.40–1.00
Carbon (C)0.15 max0.10 max0.08 max0.08 max
Cobalt (Co)1.0 max1.0 max

Mechanical Properties Comparison

PropertyInconel 600Inconel 625Inconel 718
Density (g/cm³)8.478.448.19
Melting Point1413°C (2580°F)1350°C (2460°F)1260°C (2300°F)
Tensile Strength (MPa)655 min930 min1,275 min
Yield Strength 0.2% (MPa)3105171,034
Elongation (%)4042.512
Hardness (Brinell)≤ 179 HB≤ 240 HB≤ 444 HB

Choosing the Right Inconel Fastener Grade

Not all Inconel grades are interchangeable. Each grade is engineered for a specific balance of strength, corrosion resistance, and weldability. Use this table to select the optimal grade for your service conditions.

GradeUNS NumberBest ForLimitationsTypical Uses
Inconel 600N06600Excellent oxidation & carburization resistance; good strength up to 650°CSusceptible to stress corrosion cracking in chloride environmentsHeat exchangers, chemical plant equipment, nuclear fuel rod tubing
Inconel 625N06625Outstanding pitting & crevice corrosion resistance; excellent weldabilityLower strength than 718 at elevated temperaturesMarine, subsea, offshore, chemical processing, heat exchangers
Inconel 718N07718Superior tensile and fatigue strength; age-hardenable; widest service rangeMore complex heat treatment required; higher costGas turbines, aerospace bolting, high-pressure downhole tooling
Inconel X-750N07750High creep rupture strength; excellent spring properties at temperatureModerate corrosion resistance onlyTurbine blades, springs, high-temp structural bolting
Incoloy 825N08825Resistance to sulfuric and phosphoric acids; good formabilityLower strength vs. 625Chemical processing, phosphoric acid plants, oil & gas

Inconel Fasteners Price

Product TypeApprox Price Range
Inconel Hex Bolts$8 – $45 per piece
Inconel Stud Bolts$10 – $60 per piece
Inconel Nuts$5 – $25 per piece
Inconel Washers$1 – $10 per piece
Inconel Threaded Rods$20 – $120 per meter
Inconel Anchor Bolts$15 – $80 per piece

Inconel Fasteners Sizes

Fastener TypeStandard Size Range
Bolts & ScrewsM3 to M100
NutsM3 to M100
Stud BoltsM6 to M100
Threaded Rods100 mm to 3000 mm length
WashersCustom & standard metric sizes
Anchor FastenersM10 to M72

Product Range Matrix of Inconel Fasteners

Product Type Available Grades Size Range Standards Common Uses
Hex Bolts & Heavy Hex 600, 601, 625, 718 M6 – M100  ASME B18.2.1, DIN 931, DIN 933 Structural assemblies, engine mounts, heavy machinery
Socket Head Cap Screws 625, 718, X-750 M3 – M48  ASME B18.3, DIN 912 Precision aerospace parts, high-pressure valves
Stud Bolts (Full/Double End) 600, 625, 718 M10 – M150  ASME B16.5, ASTM A193/A194 Flange connections in high-temp/high-pressure piping
Hex & Lock Nuts 600, 601, 625, 718, X-750 M3 – M150  ASTM A194, DIN 934, DIN 985 Securing stud bolts and machine bolts in corrosive environments
Washers (Flat & Spring) 625, 718, X-750 M3 – M100  DIN 125, DIN 127, ASME B18.22.1 Load distribution and vibration resistance in gas turbines
Threaded Rods 600, 625, 718 1m – 3m  ASME B18.31.2, DIN 975/976 Hanging supports in chemical tanks, custom anchoring
Machine Screws 600, 625 M1.6 – M10  ASME B18.6.3, DIN 7985 Small electronic housing in marine/medical settings

Specifications & Standards of Inconel Fasteners

Manufacturing Standards ASTM / ASME SB160, SB164, SB425, SB166, SB446, SB472 & SB574
Diameter Range Metric sizes from M10 to M100
Available Length Supplied in custom lengths up to 1000 mm
Alloy Grades Offered Inconel 600 (UNS N06600), Inconel 601 (UNS N06601), Inconel 625 (UNS N06625), Incoloy 800 (UNS N08800), Incoloy 800H/HT (UNS N08810), Incoloy 825 (UNS N08825)
Compliance Standards Manufactured as per IS, BS & ASTM specifications
Product Range Hex Bolts, Heavy Hex Nuts, Stud Bolts, Threaded Bars, Eye Bolts, Anchor Bolts, Socket Head Screws, Cotter Pins, Industrial Washers, Foundation Fasteners, Precision Fasteners & related components

International Standards & Equivalents

Grade UNS ASTM / ASME DIN / W.Nr. JIS EN / ISO Equivalent
Inconel 600N06600SB-166 / B1662.4816NCF 600NiCr15Fe
Inconel 601N06601SB-166 / B1662.4851NCF 601NiCr23Fe
Inconel 625N06625SB-446 / B4462.4856NCF 625NiCr22Mo9Nb
Inconel 718N07718SB-637 / B6372.4668NCF 718NiCr19Fe19Nb5Mo3
Inconel X-750N07750SB-637 / B6372.4669
Incoloy 800N08800SB-408 / B4081.4876NCF 800X10NiCrAlTi32-21
Incoloy 825N08825SB-425 / B4252.4858NCF 825NiCr21Mo

Stud Bolt Size & Thread Pitch Chart

Metric SizeLength Range (mm)Thread PitchCommon Pressure Class
M620 – 1001.0Class 150
M825 – 1501.25Class 150–300
M1030 – 2001.5Class 300
M1240 – 2501.75Class 300–600
M1650 – 3002.0Class 600
M2060 – 3502.5Class 900
M2480 – 4003.0Class 1500
M30100 – 5003.5Class 2500

Chemical Composition of Major Inconel Grades

Understanding the elemental makeup of each Inconel grade helps engineers specify the right fastener for the service environment. The nickel-chromium matrix provides the base corrosion resistance, while secondary elements like molybdenum, niobium, and titanium govern strength and thermal stability.

Element Inconel 600 Inconel 625 Inconel 718 Inconel X-750
Nickel (Ni) 72.0 min 58.0 min 50.0–55.0 70.0 min
Chromium (Cr) 14.0–17.0 20.0–23.0 17.0–21.0 14.0–17.0
Iron (Fe) 6.0–10.0 5.0 max Balance 5.0–9.0
Molybdenum (Mo) 8.0–10.0 2.8–3.3
Niobium (Nb + Ta) 3.15–4.15 4.75–5.50 0.70–1.20
Titanium (Ti) 0.40 max 0.65–1.15 2.25–2.75
Aluminum (Al) 0.40 max 0.20–0.80 0.40–1.00
Carbon (C) 0.15 max 0.10 max 0.08 max 0.08 max
Cobalt (Co) 1.0 max 1.0 max

Mechanical Properties Comparison

Property Inconel 600 Inconel 625 Inconel 718
Density (g/cm³) 8.47 8.44 8.19
Melting Point 1413°C (2580°F) 1350°C (2460°F) 1260°C (2300°F)
Tensile Strength (MPa) 655 min 930 min 1,275 min
Yield Strength 0.2% (MPa) 310 517 1,034
Elongation (%) 40 42.5 12
Hardness (Brinell) ≤ 179 HB ≤ 240 HB ≤ 444 HB

Choosing the Right Inconel Fastener Grade

Not all Inconel grades are interchangeable. Each grade is engineered for a specific balance of strength, corrosion resistance, and weldability. Use this table to select the optimal grade for your service conditions.

Grade UNS Number Best For Limitations Typical Uses
Inconel 600 N06600 Excellent oxidation & carburization resistance; good strength up to 650°C Susceptible to stress corrosion cracking in chloride environments Heat exchangers, chemical plant equipment, nuclear fuel rod tubing
Inconel 625 N06625 Outstanding pitting & crevice corrosion resistance; excellent weldability Lower strength than 718 at elevated temperatures Marine, subsea, offshore, chemical processing, heat exchangers
Inconel 718 N07718 Superior tensile and fatigue strength; age-hardenable; widest service range More complex heat treatment required; higher cost Gas turbines, aerospace bolting, high-pressure downhole tooling
Inconel X-750 N07750 High creep rupture strength; excellent spring properties at temperature Moderate corrosion resistance only Turbine blades, springs, high-temp structural bolting
Incoloy 825 N08825 Resistance to sulfuric and phosphoric acids; good formability Lower strength vs. 625 Chemical processing, phosphoric acid plants, oil & gas

Inconel Fasteners Price

Product TypeApprox Price Range
Inconel Hex Bolts$8 – $45 per piece
Inconel Stud Bolts$10 – $60 per piece
Inconel Nuts$5 – $25 per piece
Inconel Washers$1 – $10 per piece
Inconel Threaded Rods$20 – $120 per meter
Inconel Anchor Bolts$15 – $80 per piece

Note:
Pricing depends on:

  • Inconel grade (600, 625, 718, 825, etc.)
  • Size & length
  • Thread type
  • Quantity ordered
  • Coating & machining requirements
  • ASTM / ASME specifications

Inconel Fasteners Sizes

Fastener TypeStandard Size Range
Bolts & ScrewsM3 to M100
NutsM3 to M100
Stud BoltsM6 to M100
Threaded Rods100 mm to 3000 mm length
WashersCustom & standard metric sizes
Anchor FastenersM10 to M72

Why Choose Inconel Over Other Alloys?

Inconel vs Stainless Steel:

Where high temperature properties are required, which are above 600 °C, then in those environments Inconel fasteners are used rather than stainless steel. Although stainless steel is excellent for general purposes, it is more likely to lose its strength when it is exposed to high temperatures. About oxidation resistance, Inconel is superior, and it does not lose mechanical integrity in extremely hot conditions. Stainless steel fasteners, however, are less expensive and hence can be used in less demanding applications. In the case of the normal industrial requirements, you can check Stainless Steel Fasteners.

Inconel vs Hastelloy:

Hastelloy fasteners are more suitable when working under conditions of high acids and other chemical conditions, particularly when resistance to acids is imperative. On the other hand, Inconel fasteners are highly temperature oxidation-resistant and stable. The decision is made between chemical resistance and high-temperature performance in the application. Hastelloy Fasteners may be recommended in the case of acid-related applications.

Inconel vs Monel:

Monel is widely used in seawater and marine components and is effective under low to moderate temperatures. When high temperature strength and oxidation resistance are needed, then Inconel fasteners are the most suitable choice. In saltwater usage with reduced exposure to heat, the Monel Fasteners are commonly used.

Manufacturing & Quality Assurance

Unifit Fastener manufactures Inconel fasteners in different product forms and configurations according to applicable product standards and customer requirements. Manufacturing can include standard and custom dimensions, thread configurations and product specifications, subject to technical feasibility.

Quality and inspection requirements are determined according to the selected Inconel grade, product type and order specification. Where specified and confirmed for the order, material documentation and inspection may include Mill Test Certificates (MTC), material traceability, Positive Material Identification (PMI), dimensional inspection, hardness and tensile testing, and third-party inspection.

Applicable ASTM, ASME, DIN, ISO and other standards are selected according to the specific grade and fastener form. Testing, certification and inspection requirements should be confirmed before order placement.

Size Range & Availability

Fasteners come in different ranges, and the availability also depends on their popularity. The different size ranges and availability information are given below.

  • Diameter Range: The fasteners are available in M6 to M64 (metric) and 1/4 to 4 (imperial) to suit a wide range of applications.
  • Length Options: Supplied in standard lengths as well as custom lengths based on drawing or project requirements.
  • Thread Types: It comes in different threads like metric coarse, metric fine, UNC, UNF, and 8-UN threads.
  • Head Styles: They are manufactured in hex, socket, button, flat, and pan head designs.
  • Ex-Stock Availability: Most Common sizes available, such as M8, M10, M12, M16, M20, 1/2, and 3/4, are often available ex-stock for quick delivery.

Why Choose Unifit Fastener for Inconel?

Unifit Fasteners has enjoyed a reputable history as an exotic alloy fastener supplier since 2014, with high-quality solutions for the needy industries. Having in-house machining and high quality, all the fasteners are tested by PMI. We offer the specialization of custom production per your specifications of drawings, thus a perfect fit and performance. Competitive pricing, quick delivery time, and worldwide shipping with a good export package are some of the reasons why we are a good partner. Technical support is given by experienced engineers, and such common grades as 625 and 718 are available in stock.

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FAQs About Inconel Fasteners

Can Inconel fasteners be used in cryogenic applications?

Yes, Inconel fasteners come with strength and reliability at low temperature so it's a preferable choice for cryogenic applications.

Are Inconel fasteners magnetic?

No, Inconel fasteners are generally non-magnetic.

How do I prevent galling when installing Inconel fasteners?

To prevent galling, always use proper lubrication, anti-seize compounds, or controlled torque installation to prevent galling.

What is the lead time for custom Inconel fasteners?

Making the custom inconel fasteners typically takes 2–8 weeks, depending on size, grade, and order quantity.

Do you provide NACE MR0175-compliant Inconel fasteners?

Yes, NACE MR0175-compliant fasteners are available for sour service applications.

Can Inconel fasteners be welded?

Yes, with the use of proper welding techniques and a compatible filter, you can easily weld Inconel Fasteners.