Inconel 601 Fasteners
Inconel 601 fasteners are engineered for environments where standard stainless steel fails — operating reliably at sustained temperatures up to 2,200°F (1,204°C). Built to ASTM B166 / ASME SB166 and dual-certified to both ASTM and ASME codes, Unifit Fastener manufactures and supplies UNS N06601 bolts, nuts, stud bolts, washers, and threaded rods to industries across 40+ countries including the USA, UAE, Germany, and Saudi Arabia.
The alloy's nickel-chromium-aluminium composition forms a tightly adherent oxide scale that resists spalling even under severe thermal cycling — a critical property for furnace components, heat exchangers, and pressure vessels that demand consistent fastener performance across thousands of heat cycles. Werkstoff Nr. 2.4851 (DIN designation) makes Unifit's Inconel 601 fasteners the specification-correct choice for European procurement standards.
All fasteners are sourced from verified mills — including Usha Martin, JSPL, and Mukund Steel — backed by EN 10204 3.1 Mill Test Reports, and subject to 100% dimensional inspection and PMI verification before dispatch. Regular stock ships in 7–15 working days; custom orders in 2–4 weeks.
Request a QuoteTable of Content
- Types of Inconel 601 Fasteners
- Inconel 601 Fastener Specifications
- Chemical Composition
- Mechanical Properties
- Thermal & Electrical Properties
- Equivalent Grades
- Standard Size Dimensions
- Price List
- Applications & Industries
- Alloy Comparison
- Features & Benefits
- Quality Testing
- Marking Requirements
- Surface Finish Options
- Manufacturing Process
- Dimensional Standards
- Global Export & Supply Reach
- Related Products
Types of Inconel 601 Fasteners
ASME SB166 N06601 Tie Rods
DIN 2.4851 Inconel Countersunk Bolts
DIN 2.4851 Inconel Lag Screw
Grade N06601 Wing Screw
Inconel 601 Deck Screw
Inconel 601 Flange Bolts
Inconel Grade 601 Self Tapping Screw
Inconel UNS N06601 Carriage Bolts
N06601 Coach Screw
SB166 Inconel 601 Hex Bolts
SB166 N06601 Tie Bars
Type N06601 Self Drilling ScrewInconel 601 Fastener Specifications - ASTM B166 / UNS N06601
| Parameter | Details |
| Specification | ASTM B166 / ASME SB166 |
| UNS Number | N06601 |
| Werkstoff Nr. | 2.4851 |
| Standards | DIN, ISO, JIS, GB, IS, BS, ASTM, ASME, ANSI, UNI - all international standards |
| Size Range | M3 - M100 | 3/16" - 4" | Custom Sizes on Request |
| Fastener Length | 3 mm - 200 mm | Custom Sizes Available |
| Nut / Washer Size | M3 - M56 | 3/16" - 2" | Custom Sizes |
| Thread Types | UNF, BSW, BSF, METRIC, UNC, or as required |
| Thread Config. | ASME B1.1 2A/3A-2B/3B Inch Unified; B1.13M 6h-6G Metric Coarse |
| Head Form | Hex, Square, Round, Hex Flange, Flat, T-Head, Triangular, etc. |
| Neck Type | Hex, Square, Triangular, Oval, Knurled |
| Surface Treatment | Passivation / Plain |
| Surface Coatings | Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, others on request |
| Manufacturing Process | Wire Drawing, Cold Heading, Insert Tapping, Heat Treatment, Surface Plating, Inspection, Packing |
| Tolerance | +/-0.03 mm (OEM / ODM available) |
| Hardness | Brinell 179 HB max | Rockwell B 88 max (annealed condition) |
| Product Form | Bolts, Nuts, Studs, Washers, Threaded Rods, Socket Cap Screws, U-Bolts, Eye Bolts |
| Finish Standards | ASTM B912 (passivation), MIL-DTL-5541 (chromate), ASTM B633 (zinc electroplating) |
| Test Certificates | EN 10204 / 3.1 MTC; PED 97/23/EC; Merkblatt AD 2000 W2 |
| Certification | Dual Certified - ASTM & ASME Codes |
| Delivery Time | Regular stock: 7-15 days | Custom orders: 2-4 weeks |
| Packaging | Bulk cartons, pallets, small boxes, or as per customer request |
| Place of Origin | India |
Chemical Composition of Inconel 601 Fasteners
| Grade | Ni (%) | Cr (%) | Fe (%) | Al (%) | C (max) | Mn (max) | S (max) |
| Inconel 601 | 58.0 - 63.0 | 21.0 - 25.0 | Balance | 1.0 - 1.7 | 0.10 max | 1.0 max | 0.015 max |
Note: Silicon (Si) max 0.50%; Copper (Cu) max 1.0%; Sulphur (S) max 0.015%.
Mechanical Properties of Inconel 601 Fasteners
Inconel 601 fasteners maintain their mechanical integrity across a broad temperature range - from cryogenic service at -196°C to sustained oxidising environments at 1,204°C - making them one of the most thermally versatile nickel alloy fasteners available in the ASTM B166 product family.
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%) | Elongation | Brinell Hardness | Rockwell Hardness |
| 8.1 g/cm³ | 1411°C (2571°F) | Psi - 80,000 | MPa - 550 | Psi - 30,000 | MPa - 205 | 30% | 179 HB max | B 88 max |
Thermal & Electrical Properties
| Property | Metric | Imperial |
| CTE (linear, 20°C) | 13.75 µm/m-°C | 7.64 µin/in-°F |
| Heat Capacity | 0.448 J/g-°C | 0.107 BTU/lb-°F |
| Thermal Conductivity | 11.2 W/m-K | 77.7 BTU-in/hr-ft²-°F |
| Electrical Resistivity | 0.000119 Ohm-Cm | 0.000119 Ohm-Cm |
| Curie Temperature | Max -196°C | Max -321°F |
Inconel 601 Equivalent Grades - International Standards
Inconel 601 is manufactured and traded under multiple international designations. The table below provides direct specification equivalencies for procurement across European, Japanese, British, and American standards.
| Alloy | UNS | WNR | AFNOR | EN | JIS | BS |
| Alloy 601 | N06601 | 2.4851 | NiCr23Fe | NiCr15Fe | NCF 601 | NA 49 |
Standard Size Dimensions
All Inconel 601 fasteners are available across the full dimensional range listed below. For non-standard sizes, Unifit Fastener offers OEM/ODM custom fabrication with +/-0.03 mm tolerance.
Bolt Dimensions - Representative Excerpt
| Nom. Size (in) | mm | Body Dia. Max | Width Flats F | Width Corners G | Head Height H |
| 1/4 | 0.25 | 0.26 | 0.438 | 0.505 | 11/64 |
| 1/2 | 0.50 | 0.515 | 0.750 | 0.866 | 21/64 |
| 3/4 | 0.75 | 0.768 | 1.125 | 1.299 | 1/2 |
| 1" | 1.00 | 1.022 | 1.500 | 1.732 | 41/64 |
| 2" | 2.00 | 2.039 | 3.000 | 3.464 | 1 11/32 |
| 4" | 4.00 | 4.111 | 6.000 | 6.928 | 2 19/32 |
Stud Bolt Dimensions - ASME B16.5 Class 150 Flanges
| NPS | No. of Bolts | Bolt Dia. | Raised Face (in) | Ring Joint (in) | OD of Flange |
| 1/2 | 4 | 1/2 | 2 1/4 | - | 3 1/2 |
| 1 | 4 | 1/2 | 2 1/2 | 3 | 4 1/4 |
| 2 | 4 | 5/8 | 3 1/4 | 3 3/4 | 6 |
| 4 | 8 | 5/8 | 3 1/2 | 4 | 9 |
| 8 | 8 | 3/4 | 4 1/4 | 4 3/4 | 13 1/2 |
| 12 | 12 | 7/8 | 4 1/2 | 5 | 19 |
| 24 | 20 | 1 1/4 | 6 3/4 | 7 1/4 | 32 |
Full dimensional data available for ASME B16.5 Class 150 through Class 2500 flange ratings.
Inconel 601 Fasteners Price List
| Fastener Type | INR / Piece | USD / Piece | EUR / Piece |
| Inconel 601 Hex Head Bolt | ~₹462 | ~$6.25 | ~€5.24 |
| Inconel 601 Machine Bolt | ~₹407 | ~$5.50 | ~€4.61 |
| Inconel 601 Screws | ~₹252 | ~$3.40 | ~€2.85 |
| Inconel 601 Allen Bolt | ~₹370 | ~$5.00 | ~€4.19 |
| Inconel 601 Nuts | ~₹104 | ~$1.40 | ~€1.17 |
| Inconel 601 Washer | ~₹104 | ~$1.40 | ~€1.17 |
Prices are indicative as of Q2 2026 and subject to market variation in nickel alloy raw material costs. Final pricing depends on quantity, size, surface treatment, and configuration. Standard stock items ship in 7-15 working days. Custom or large-quantity orders require 2-4 weeks from order confirmation.
Applications & Industries - Where Are Inconel 601 Fasteners Used?
The alloy's unique combination of oxidation resistance, high-temperature stability, and corrosion immunity makes Inconel 601 fasteners the preferred choice across a diverse range of heavy industries.
| Industry | Key Applications |
| Aerospace & Aviation | Jet engine components, exhaust systems, turbine hardware |
| Power Generation | Boiler superheaters, nuclear reactor vessels, steam turbine hardware |
| Chemical & Petrochemical | Heat exchangers, reactor vessels, pressure piping flanges |
| Oil & Gas | Wellhead equipment, pressure vessel bolting, refinery heat exchanger flanges, and downstream processing units where temperatures exceed the capability of 316L or 904L stainless steel |
| Pollution Control & Waste Incineration | Flue gas handling systems, scrubbers, thermal oxidizers |
| Marine & Offshore | Sub-sea manifolds, offshore platform conductor pipe connections, NACE MR0175/ISO 15156 sour service applications |
| Automobile & Transportation | Turbocharger fasteners, exhaust manifold hardware |
| Furnace & Heat Treatment Equipment | Radiant tubes, muffle furnace fixtures, retorts |
| Pharmaceutical & Food Processing | CIP/SIP system bolting, autoclave hardware, and process vessel fasteners requiring corrosion resistance |
| Agricultural Equipment | High-stress machinery fasteners exposed to aggressive environments |
Inconel 601 vs Inconel 600 vs Inconel 625 - Which Alloy Should You Choose?
| Property | Inconel 601 | Inconel 600 | Inconel 625 |
| UNS | N06601 | N06600 | N06625 |
| Max Service Temp | 2,200°F (1,204°C) | 2,000°F (1,093°C) | 1,800°F (982°C) |
| Key Strength | Oxidation resistance | General corrosion | Fatigue & creep strength |
| Al Content | 1.0-1.7% | None | None |
| Nb/Mo Content | None | None | Nb 3.15-4.15%, Mo 8-10% |
| Best For | Furnace parts, thermal cycling | Chemical/aqueous corrosion | High-strength seawater |
| ASTM Standard | B166 | B166 | B446 |
Conclusion: If your application involves sustained high-temperature oxidising conditions above 1,000°C, Inconel 601 is the specification-correct choice. For aqueous corrosion or fatigue-critical seawater environments, Inconel 625 delivers superior performance.
Key Features & Benefits of Inconel 601 Fasteners
| Feature | Benefit |
| Exceptional Oxidation Resistance | Resists scaling up to 2,200°F (1,204°C); ideal for cyclic high-heat environments |
| High Mechanical Strength | Maintains structural integrity under sustained mechanical loads at elevated temperatures |
| Aqueous Corrosion Resistance | FCC microstructure reduces corrosion rates even in aggressive aqueous media |
| Excellent Weldability | Can be welded in the strengthened or annealed condition using matching filler metal ERNiCrFe-11 without risk of hot cracking |
| Metallurgical Stability | FCC austenitic structure remains stable from cryogenic temperatures to 2,200°F |
| Easy to Machine & Form | Good machinability and forming characteristics reduce manufacturing lead times |
| Low Deformation Rate | Lower creep rate than many nickel alloys, extending service life under high-stress loads |
| Wide Size Range | Available from M3 to M100 and 3/16" to 4", with fully custom sizes on request |
| Specification Compliance | Dual-certified to ASTM and ASME codes; EN 10204 3.1 Mill Test Reports supplied with every order |
Quality Testing of Inconel 601 Fasteners
Every batch of Inconel 601 fasteners undergoes a structured quality gate before dispatch, covering destructive and non-destructive evaluation as per ASTM, ASME, and EN inspection protocols. 100% of orders are dispatched with EN 10204 3.1 Mill Test Reports.
Destructive Tests
- Tensile Strength Test (ASTM F606 / ISO 898)
- Elongation & Proof Load Test
- Flattening Test
- Macro Test & Micro Test
Non-Destructive Tests (NDT)
- Hardness Test (Brinell / Rockwell / Vickers)
- Intergranular Corrosion (IGC) Test
- Pitting Resistance Test
- Chemical Analysis - Spectro Analysis
- Positive Material Identification (PMI Testing)
- Flaring Test
Third-party inspection is available through SGS, Bureau Veritas, or TUV Rheinland upon customer request.
Stud & Bolt Marking Requirements (DIN 2.4851)
- Brinell Hardness Number
- Nominal Diameter
- Manufacturer's Name or Symbol (Unifit Fastener)
- Grade Designation
- Heat Code / Lot Code
- ASTM Specification Reference
Surface Finish Options
| Surface Finish | Typical Application | Standard Reference |
| Zinc/Nickel Electrodeposition | General corrosion protection, cost-effective | ISO 4042 | ASTM B633 |
| Teflon / PTFE Coating | Chemical resistance, non-stick applications | ASTM D1506 |
| Xylan Coating | High-temperature and chemical media resistance | - |
| Cadmium / Electro Cadmium Plating | Aerospace and marine corrosion protection. Confirm project compliance requirements before ordering. | AMS2416 |
| Hot Dipped Galvanizing | Heavy-duty outdoor / structural applications | ASTM A153 | ISO 1461 |
| Silver Coating | Electrical conductivity and anti-galling | - |
| Dacromet Finish | Environmental corrosion, RoHS compliant | ISO 10683 |
Manufacturing Process at Unifit Fastener
Raw Material Sourcing: All Inconel 601 raw materials are sourced from verified mills including Usha Martin, JSPL, Mukund Steel, Tata Steel, and RINL with full traceability.
- Production Methods: CNC machining up to M100 / 4" diameter, hot forging from M24 to M100, and cold forging from M2 to M24.
- Heat Treatment: Solution annealing and age hardening applied as required by specification.
- Surface Treatment: In-house passivation and third-party coating services for specialty finishes.
- Quality Inspection: 100% visual inspection, dimensional verification, hardness testing, and PMI before dispatch.
- Packing & Dispatch: Fasteners packed in bulk cartons, pallet boxes, or custom packaging. Regular stock dispatched in 7-15 working days.
All manufacturing processes are conducted under ISO 9001:2015 quality management system protocols, with process documentation retained for a minimum of 10 years per EN 10204 requirements.
Dimensional Standards for Inconel 601 Bolts & Nuts
| Fastener Type | ISO | DIN | ANSI | BS |
| Bolts & Set Screws | 4014 / 4017 | 931 / 933 | B18.2.1 | 1083 / 1768 |
| Socket Cap Screws | 4762 | 912 / 913 | B18.3 | 2470 / 4168 |
| Stud Bolts | - | 975 / 976 | B16.5 | 4882 |
| Nuts (Normal & Heavy) | 4032 | 934 | B18.2.2 | 1083 / 1769 |
| Engineer Studs | - | 938 / 939 | - | 2693 / 4439 |
| Washers | Flat / Tab / Spring | - | - | Special Designs |
Inconel 601 Fasteners - Global Export & Supply Reach
Unifit Fastener exports Inconel 601 fasteners to buyers in 40+ countries across six continents. Our primary supply markets include:
- Middle East & Gulf: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
- North America: USA, Canada, Mexico
- Europe: Germany, UK, Italy, Netherlands, France, Spain
- South & Southeast Asia: Singapore, Malaysia, Indonesia, Thailand, Vietnam
- Africa: South Africa, Nigeria, Egypt
- Australasia: Australia, New Zealand
All export orders are shipped with complete documentation including commercial invoice, packing list, certificate of origin, EN 10204 3.1 MTR, and customs-ready HS Code classification.
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Frequently Asked Questions (FAQs)
Inconel 601 is a nickel-chromium alloy known for its excellent resistance to high-temperature oxidation, corrosion, and carburization. It is widely used for manufacturing fasteners in extreme heat environments.
Inconel 601 fasteners are commonly used in heat treatment equipment, petrochemical plants, power generation facilities, aerospace components, industrial furnaces, and thermal processing systems.
Inconel 601 is available in various fastener forms, including hex bolts, socket head cap screws, studs, threaded rods, nuts, washers, anchor bolts, and custom-engineered fastening solutions.
Inconel 601 contains added aluminum, which significantly improves oxidation resistance at elevated temperatures compared to Inconel 600, making it better suited for high-temperature applications.
Yes. Due to their exceptional resistance to oxidation, scaling, and thermal cycling, Inconel 601 fasteners are widely used in industrial furnaces, kiln equipment, and heat treatment systems.