Unifit Fastener manufactures and exports ASTM B166 Inconel 600 Fasteners (UNS N06600) for high-temperature, corrosive, and high-pressure service environments. Produced from a nickel-chromium alloy, these fasteners deliver exceptional resistance against oxidation, corrosion, and elevated temperatures. The alloy maintains excellent structural stability across continuous service temperatures from cryogenic to 1700°F (927°C), with short-term tolerance up to 2000°F in low-stress oxidising conditions.
Inconel 600 bolts, nuts, screws, and washers are widely specified in chemical processing, marine, aerospace, and heat-treatment applications because of their superior mechanical strength and long service life. The high nickel content (≥72%) enhances resistance against chloride stress corrosion cracking, while chromium forms a protective oxide layer that improves durability in aggressive operating conditions
Socket head cap screws and U-bolts manufactured from UNS N06600 perform reliably under continuous heat and pressure exposure. UNS N06600 derives its 655 MPa minimum tensile strength from solid-solution strengthening of the nickel-chromium matrix; no precipitation hardening is required, making them ideal for critical bolting in chemical plants, furnace equipment, and power generation assemblies.
Request QuoteTable of Contents
- About ASTM B166 Inconel 600 Bolts & Nuts
- ASTM B166 Inconel 600 Fasteners Technical Specifications
- Types of Inconel 600 Fasteners
- Equivalent Grades of Inconel 600 Fasteners
- Chemical Composition of Inconel 600 Fasteners
- Mechanical Properties of Inconel 600 Fasteners
- Inconel 600 Bolt Dimensions
- Inconel 600 Stud Bolt Dimensions
- Inconel 600 Nut Dimensions
- Inconel 600 Washer Dimensions
- Inconel 600 Fastener Heat Treatment
- Applications of Inconel 600 Fasteners
- Testing of Inconel 600 Fasteners
- Packaging of Inconel 600 Fasteners
- Inconel 600 vs Other High-Temperature Alloys
- Inconel 600 Bolt Torque Chart
- FAQ's About Inconel 600 Fasteners
About ASTM B166 Inconel 600 Bolts & Nuts
Inconel 600 Fasteners are non-magnetic nickel alloy fastening solutions designed for high-temperature and corrosive service environments. UNS N06600 fasteners combine GTAW/GMAW weldability using ERNiCrFe-3 filler (AWS A5.14) with room-temperature tensile strength ≥655 MPa, making them specified for both fabricated assemblies and heavy industrial bolting under ASME Section IX welding qualifications.
The presence of nickel in Alloy 600 fasteners provides excellent resistance against several organic and inorganic compounds, while chromium improves oxidation resistance at elevated temperatures. These fasteners also perform effectively in alkaline media and environments prone to chloride-induced stress corrosion cracking.
Hot and cold forming processes are commonly used for manufacturing ASTM B166 Inconel 600 bolts, screws, threaded rods, and nuts. For optimal results, hot working is performed between 1600°F and 2250°F. Prolonged exposure in the 1000°F to 1400°F (538°C-760°C) sensitisation range should be avoided during fabrication or heat treatment, as carbon precipitation in this range can promote intergranular corrosion.
Chemical plant operators, heat-treatment equipment manufacturers, and nuclear industry procurement teams specify DIN 2.4816 (Inconel 600) heavy hex bolts and threaded fasteners where chromium oxide scale stability above 700°C is a design requirement and where carbon steel or austenitic stainless grades lose creep resistance.
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ASTM B166 Inconel 600 Fasteners Technical Specifications
| Property | Details |
|---|---|
| Material Grade | Inconel 600 / UNS N06600 |
| Specification | ASTM B166 / ASME SB166 |
| Standards | DIN, ISO, JIS, ASTM, BS, IS |
| Diameter Range | M3 to M100 |
| Length Range | 3 mm to 200 mm (custom lengths available on request) |
| Nut Sizes | M3 to M56 |
| Washer Sizes | M3 to M56 |
| Thread Type | Metric, UNC, UNF, BSW, BSF |
| Thread Standard | ASME B1.1, ASME B1.13M |
| Available Forms | Hex, Round, Square, Threaded |
| Head Types | Hex Head, T-Head, Flat Head, Flange |
| Neck Styles | Knurled, Oval, Square, Hex |
| Tolerance | Dimensional tolerance: ±0.03 mm per customer drawing |
| Surface Finish | Plain, Passivated |
| Coating Options | Zinc, Xylan, PTFE, Black Oxide (Cadmium NOT recommended for nuclear applications per ASTM A320; PTFE preferred below 260°C) |
| Manufacturing Method | Cold Heading, Wire Drawing, Heat Treatment |
| Inspection | Third-Party Inspection Available |
| Certification | EN 10204 3.1 / PED Certified |
| Packaging | Cartons, Pallets, Wooden Boxes |
| Supply Condition | OEM & Custom Sizes Available |
| Delivery Time | Standard: 7-15 Days |
| Origin | India |
Types Of Inconel 600 Fasteners
Chemical Composition of Inconel 600 Fasteners
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 72.00 Min |
| Chromium (Cr) | 14.00 - 17.00 |
| Iron (Fe) | 6.00 - 10.00 |
| Carbon (C) | 0.15 Max |
| Manganese (Mn) | 1.00 Max |
| Silicon (Si) | 0.50 Max |
| Copper (Cu) | 0.50 Max |
| Sulfur (S) | 0.015 Max |
Mechanical Properties of Inconel 600 Fasteners
| Property | Value |
|---|---|
| Density | 8.47 g/cm³ |
| Melting Range | 1354-1413°C (2470-2575°F) |
| Tensile Strength | 655 MPa min (ASTM B166 annealed) |
| Yield Strength (0.2%) | 310 MPa min (ASTM B166 annealed) |
| Elongation | 40% min (annealed) |
| Hardness | ≤ 179 HB (Brinell, typical) |
| Corrosion Resistance | Excellent |
| Oxidation Resistance | High |
| Magnetic Property | Non-Magnetic |
Equivalent Grades of Inconel 600 Fasteners
| Grade | UNS Number | Werkstoff No. | EN | JIS | BS | AFNOR |
|---|---|---|---|---|---|---|
| Inconel 600 | N06600 | 2.4816 | NiCr15Fe | NCF 600 | NA 13 | NC15Fe* |
*AFNOR designation NC15Fe per NF A49-218. Confirm with client before publishing.
Inconel 600 Bolt Dimensions
Standard Dimensions of Inconel 600 Hex Bolts (ASME B18.2.1)
| Bolt Size | Width Across Flats | Head Height | Thread (UNC) | Thread Length (Short) | Thread Length (Long) |
|---|---|---|---|---|---|
| 1/4" | 7/16" | 11/64" | 1/4-20 UNC | 0.75" | 1" |
| 3/8" | 9/16" | 1/4" | 3/8-16 UNC | 1" | 1.25" |
| 1/2" | 3/4" | 11/32" | 1/2-13 UNC | 1.25" | 1.5" |
| 5/8" | 15/16" | 27/64" | 5/8-11 UNC | 1.5" | 1.75" |
| 3/4" | 1-1/8" | 1/2" | 3/4-10 UNC | 1.75" | 2" |
| 1" | 1-1/2" | 43/64" | 1-8 UNC | 2.25" | 2.5" |
| 1-1/4" | 1-7/8" | 27/32" | 1-1/4-7 UNC | 2.75" | 3" |
| 1-1/2" | 2-1/4" | 1" | 1-1/2-6 UNC | 3.25" | 3.5" |
| 2" | 3" | 1-11/32" | 2-4-1/2 UNC | 4.25" | 4.5" |
| 3" | 4-1/2" | 2" | 3-4 UNC | 6.25" | 6.5" |
Inconel 600 Stud Bolt Dimensions
Stud Bolt Dimension Chart (ASME B16.5)
| Nominal Diameter | Tap End Thread Length | Nut End Thread Length (≤10") | Nut End Thread Length (>10") |
|---|---|---|---|
| 1/4" | 0.100 | 0.750 | 1.500 |
| 3/8" | 0.125 | 1.000 | 1.750 |
| 1/2" | 0.154 | 1.250 | 2.000 |
| 5/8" | 0.182 | 1.500 | 2.250 |
| 3/4" | 0.200 | 1.750 | 2.500 |
| 1" | 0.250 | 2.250 | 3.000 |
| 1-1/4" | 0.286 | 2.750 | 3.500 |
| 1-1/2" | 0.333 | 3.250 | 4.000 |
| 2" | 0.444 | 4.250 | 5.000 |
| 3" | 0.500 | 6.500 | 7.000 |
Inconel 600 Nut Dimensions
Heavy Hex Nut Dimensions (ASME B18.2.2)
| Nut Size | Width Across Flats | Nut Thickness | Jam Nut Thickness |
|---|---|---|---|
| 1/4" | 1/2" | 15/64" | 11/64" |
| 3/8" | 11/16" | 23/64" | 15/64" |
| 1/2" | 7/8" | 31/64" | 19/64" |
| 5/8" | 1-1/16" | 39/64" | 23/64" |
| 3/4" | 1-1/4" | 47/64" | 27/64" |
| 1" | 1-5/8" | 63/64" | 35/64" |
| 1-1/4" | 2" | 1-7/32" | 23/32" |
| 1-1/2" | 2-3/8" | 1-15/32" | 27/32" |
| 2" | 3-1/8" | 1-31/32" | 1-3/32" |
| 3" | 4-5/8" | 2-61/64" | 1-45/64" |
Inconel 600 Washer Dimensions
Washer Size Chart - Metric per DIN 125 / DIN 9021
Note: Washer dimensions below are supplied in metric per DIN 125/DIN 9021. Imperial washer sizes are available on request per ASME B18.22.1.
| Nominal Size | Inner Diameter | Outer Diameter | Standard Thickness | Extra Thick |
|---|---|---|---|---|
| 12 mm | 14 - 14.4 mm | 25.7 - 27 mm | 3.1 - 4.6 mm | 8 - 10 mm |
| 16 mm | 18 - 18.4 mm | 32.4 - 34 mm | 3.1 - 4.6 mm | 8 - 10 mm |
| 20 mm | 22 - 22.5 mm | 40.4 - 42 mm | 3.1 - 4.6 mm | 8 - 10 mm |
| 24 mm | 26 - 26.5 mm | 48.4 - 50 mm | 3.4 - 4.6 mm | 8 - 10 mm |
| 30 mm | 33 - 33.6 mm | 58.1 - 60 mm | 3.4 - 4.6 mm | 8 - 10 mm |
| 42 mm | 45 - 45.6 mm | 81.8 - 84 mm | 4.6 - 7.2 mm | 8 - 10 mm |
| 56 mm | 62 - 62.7 mm | 104.8 - 107 mm | 6.1 - 8.7 mm | 8 - 10 mm |
| 80 mm | 86 - 86.9 mm | 139.5 - 142 mm | 6.1 - 8.7 mm | 8 - 10 mm |
| 100 mm | 107 - 107.9 mm | 173.5 - 176 mm | 6.1 - 8.7 mm | 8 - 10 mm |
Different Types Of Inconel 600 Fasteners
Different Types Of Bolts:
Different Types Of Nuts:
Different Types Of Washers:
Different Types of Screws:
Inconel 600 Fastener Heat Treatment
Inconel 600 fasteners are supplied in the annealed condition per ASTM B166. Solution annealing is performed between 1010°C and 1066°C (1850°F-1950°F) followed by rapid cooling to achieve optimum corrosion resistance and mechanical ductility.
Hot working is carried out between 1600°F and 2250°F (871°C-1232°C). Prolonged exposure in the 538°C-760°C (1000°F-1400°F) sensitisation range is avoided during fabrication to prevent carbon precipitation at grain boundaries, which can lead to intergranular corrosion in service.
Applications of Inconel 600 Fasteners
Industrial Applications
Inconel 600 Fasteners (UNS N06600) are specified wherever service conditions exceed the oxidation and carburisation resistance of austenitic stainless steel, typically above 650°C, in halide-bearing atmospheres, or in furnace environments with thermal cycling above 1000°C.
Common Applications:
- Chemical Processing Industry - reactor flanges, heat exchanger bolting, acid plant assemblies
- Marine & Offshore Equipment - seawater-cooled systems, subsea hardware
- Aerospace Components - engine mounting hardware, exhaust system fasteners
- Heat Treatment Furnaces - retort bolting, conveyor fixings, radiant tube anchors
- Nuclear Auxiliary Systems and Heat Exchanger Components
- Gas Turbine Components - combustor casing, transition duct bolting
- Petrochemical Industry - hydrocracker and reformer bolting
- Power Generation Plants - steam generator and boiler fasteners
- Pollution Control Equipment - scrubber and flue gas desulphurisation hardware
- Food & Beverage Heat Exchangers - where product-contact stainless grades are insufficient for CIP cleaning temperatures above 160°C
Testing of Inconel 600 Fasteners
Quality Testing & Inspection
At Unifit Fastener, Inconel 600 Fasteners undergo strict quality checks to ensure dimensional accuracy and superior mechanical performance.
Testing Methods:
- Positive Material Identification (PMI)
- Hardness Testing
- Tensile Strength Testing
- Ultrasonic Testing (UT)
- Intergranular Corrosion (IGC) Test per ASTM A262 Practice E
- Chemical Analysis
- Third-Party Inspection (available on request)
- Micro & Macro Examination
- Flattening & Flaring Tests
Each Inconel 600 fastener batch is released with EN 10204 3.1 mill test certificates. 3.2 certification (third-party witnessed) is available upon request for nuclear, pressure vessel, or offshore procurement packages.
Packaging of Inconel 600 Fasteners
Packaging & Supply
Unifit Fastener supplies Inconel 600 Fasteners with export-grade packaging to prevent transit damage and contamination.
Packaging Options:
- Wooden Boxes
- Corrugated Cartons
- Pallet Packaging
- Bubble Wrapped Bundles
- Plastic Protected Packing
- Custom Export Packaging
Each package is marked with heat number, material grade, size, and EN 10204 certificate reference for full traceability on receipt.
Inconel 600 vs Other High-Temperature Alloys - Corrosion Resistance Comparison
| Environment | Inconel 600 (UNS N06600) | SS 316L | Hastelloy C276 |
|---|---|---|---|
| Oxidising atmosphere >650°C | Excellent | Moderate | Good |
| Chloride SCC resistance | High (≥72% Ni) | Poor | Excellent |
| NaOH (concentrated, <315°C) | Good | Moderate | Good |
| HF acid environments | Limited | Poor | Excellent |
| Carburising atmospheres | Excellent | Poor-Moderate | Good |
| Thermal cycling >1000°C | Excellent | Poor | Moderate |
Note: For sustained high-stress applications above 927°C (1700°F), consider Inconel 601 or Inconel X-750.
See also: Inconel 625 Fasteners | Inconel Fasteners | ASTM B166
Inconel 600 Bolt Torque Chart
The torque values below are indicative for UNS N06600 fasteners installed dry (no lubricant) at room temperature. For lubricated or elevated-temperature installations, apply appropriate torque correction factors per ASME PCC-1.
| Bolt Size | Property Class | Torque (Nm) - Dry | Torque (ft-lb) - Dry |
|---|---|---|---|
| 1/4" (M6 equiv.) | ASTM B166 Annealed | 5 - 7 | 3.7 - 5.2 |
| 3/8" (M10 equiv.) | ASTM B166 Annealed | 18 - 22 | 13 - 16 |
| 1/2" (M12 equiv.) | ASTM B166 Annealed | 40 - 50 | 30 - 37 |
| 5/8" (M16 equiv.) | ASTM B166 Annealed | 80 - 100 | 59 - 74 |
| 3/4" (M20 equiv.) | ASTM B166 Annealed | 140 - 170 | 103 - 125 |
| 1" (M24 equiv.) | ASTM B166 Annealed | 280 - 330 | 206 - 243 |
| 1-1/4" (M30 equiv.) | ASTM B166 Annealed | 500 - 600 | 369 - 442 |
| 1-1/2" (M36 equiv.) | ASTM B166 Annealed | 800 - 950 | 590 - 700 |
Inconel 600 Fasteners Price in India
Inconel 600 fasteners are seen as high quality parts because they can handle high heat corrosion and oxidation. In India their price depends on many things like the type of fastener such as nuts, studs, bolts or threaded rods the size any custom needs and the availability of raw materials. At Unifit Fastener we keep our prices fair while making sure the quality stays high. Our fasteners match global standards and fit the needs of different industries.
For exact prices and custom quotes you can contact our sales team. We promise good value with dependable service and on time delivery.
Request QuoteFAQ's About Inconel 600 Fasteners
What is Inconel 600 and why is it used for fasteners?
Inconel 600 is a nickel-chromium-iron alloy known for its high mechanical strength and excellent resistance to heat, oxidation and corrosion. Its composition makes it suitable for demanding industrial applications such as furnaces, chemical plants, marine systems and heat exchangers.
Can Inconel 600 fasteners be heat treated for hardening?
No; Inconel 600 cannot be hardened by conventional heat treatment. Instead, high strength is achieved through cold working (mechanical deformation) which gives the fasteners high accuracy and durability in demanding conditions.
Do Inconel 600 fasteners resist carburization and oxidation?
Yes. The chromium content provides stability and protection against oxidation and sulfur environments, while the nickel content protects against carburization at high temperatures.
Can Inconel 600 fasteners be used in cryogenic temperatures?
Yes. The alloy maintains impact strength and structural integrity even at very low temperatures, making it suitable for cryogenic and low-temperature applications.