Inconel 600 FastenersASTM B166 UNS N06600 · Manufacturer, stockist & exporter, India
Also sold as Alloy 600 · UNS N06600 · W.Nr 2.4816 · Nicrofer 7216
Inconel 600 fasteners — stud bolts, hex bolts, nuts and washers — are made from ASTM B166 bar stock to ASME B18 dimensions. It is a nickel–chromium–iron alloy, chosen for high-temperature oxidation, caustic and nuclear service. Kanak Steel & Engineering Co. supplies it with EN 10204 3.1 mill certificates from Mumbai to buyers across India, the Gulf, South-East Asia, South America, Europe, the UK and the USA.
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on every heat
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Inconel 600 Fasteners?
Inconel 600 fasteners is a nickel–chromium–iron alloy supplied as fasteners to ASTM B166 (UNS N06600). Buyers specify it for high-temperature oxidation, caustic and nuclear service. It is also sold as Alloy 600, UNS N06600, W.Nr 2.4816.
- What it is
- Nickel–chromium–iron alloy
- Bar stock
- ASTM B166
- Dimensions
- ASME B18.2.1 · B18.2.2 · B18.31.2
- Threads
- UNC · UN-8 · metric
- Sizes
- M10 – M64 · ½" – 4"
- Best at
- High-temperature oxidation, caustic and nuclear service
Inconel 600 Fasteners Specification & Sizes
| Material | ASTM B166 |
|---|---|
| Dimensional standards | ASME B18.2.1 (bolts) · B18.2.2 (nuts) · B18.31.2 (studs) · DIN 931 / 933 / 934 |
| Types | Stud bolt · Hex bolt · Heavy hex nut · Hex nut · Washer · Threaded rod · U-bolt · Eye bolt · Anchor bolt · Foundation bolt · Socket head cap screw · Machine screw |
| Threads | UNC, UN-8 and metric coarse |
| Coating | Plain · PTFE on request |
| Documents | EN 10204 3.1 |
Inconel 600 Stud Bolts: Grade & Nut Pairing
Inconel 600 studs and nuts are machined from ASTM B166 bar; the nut is usually the same alloy.
Torque (T = K × F × d), stud length and coatings are covered in the fasteners guide.
| Galling | Stainless and nickel-alloy threads gall — always use anti-seize, and avoid high-speed tightening |
|---|---|
| Coatings | Usually supplied plain; PTFE coating on request to ease tightening |
| Marking | Grade symbol and maker's mark on each stud end and nut, as the standard requires |
| Certificates | EN 10204 3.1 for the bar heat; mechanical test reports on the finished bolts on request |
Inconel 600 Fasteners Chemical Composition
| Element | Weight % |
|---|---|
| Nickel (+Co) | 72.0 min |
| Chromium | 14.0 – 17.0 |
| Iron | 6.0 – 10.0 |
| Carbon | 0.15 max |
| Manganese | 1.0 max |
| Silicon | 0.5 max |
| Copper | 0.5 max |
| Sulphur | 0.015 max |
Inconel 600 Fasteners Mechanical Properties
| Annealed plate | Value |
|---|---|
| Tensile strength | 550 MPa · 80 ksi |
| Yield strength 0.2% | 240 MPa · 35 ksi |
| Elongation | 30% |
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 8.47 g/cm³ |
| Melting range | 1354 – 1413 °C |
| Magnetic | Non-magnetic |
Inconel 600 Equivalent Grades
Values follow ASTM B168 for UNS N06600. Always check against the edition named on your purchase order.
Six-digit Harmonized System heading (nickel alloy, chapter 75). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify Inconel 600 Fasteners with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. Inconel 600 is most often mixed up with Incoloy 800 / 800H / 800HT — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen; those come from the mill certificate or optical emission (OES) testing. We PMI-test nickel alloys as standard and any grade on request.
| Element | Inconel 600 | Incoloy 800 / 800H / 800HT |
|---|---|---|
| Nickel | 72.0 min | 30.0 – 35.0 |
| Chromium | 14.0 – 17.0 | 19.0 – 23.0 |
| Copper | 0.5 max | 0.75 max |
| Titanium | residual | 0.15 – 0.60 |
| Iron | 6.0 – 10.0 | 39.5 min |
| Manganese | 1.0 max | 1.5 max |
Inconel 600 fasteners by type
Inconel 600 Fasteners Applications
Inconel 600 is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
Inconel 600 Fasteners vs 310S, 800 and 625
| Grade | Fasteners standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| Incoloy 800 / 800H / 800HT | ASTM B408 | — | Furnaces, petrochemical heaters and high-temperature piping |
| Inconel 600 | ASTM B166 | — | High-temperature oxidation, caustic and nuclear service |
| SS 310 / 310S | ASTM A276 / A479 | ≈ 25 | Furnaces, burners and heat treatment at high temperature |
| Inconel 625 | ASTM B446 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Inconel 600 Corrosion Resistance — Element by Element
Each alloying addition has a job. Knowing which one protects against your medium is the quickest way to judge whether 600 fits.
Over 72% nickel makes 600 practically immune to chloride stress-corrosion cracking and very good in caustic soda.
Chromium gives oxidation resistance to about 1175 °C.
Resists carburising and nitriding atmospheres in furnaces.
Not a first choice for sulphuric or hydrochloric acid — see 825 or C276.
How your 600 fasteners order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked and material is PMI-tested before processing.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Welding & Fabricating Inconel 600 Fasteners
Inconel 600 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ERNiCr-3 (AWS A5.14) |
|---|---|
| Over-alloyed filler | ENiCrFe-3 electrode |
| Preheat | Not required; keep interpass temperature low |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also 600 fittings and 600 flanges for the matching pipe-system parts.
How to Order Inconel 600 Fasteners: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Fastener type, size and length
- Thread form
- Material and marking
- Quantity in sets
- Certificate type
- Delivery port and date
Inconel 600 fasteners for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiInconel 600 fasteners — questions buyers ask
Is Inconel 600 the same as Alloy 600?
Yes. Alloy 600, UNS N06600, W.Nr 2.4816 all refer to the same material, and fasteners is ordered to ASTM B166 whichever name is on the enquiry.
Why use Inconel 600 bolts instead of B7 carbon steel?
On Inconel 600 flanges in corrosive service, carbon-steel bolts corrode first. Matching-alloy bolting avoids galvanic corrosion and bolt failure.
What nut goes with Inconel 600 stud bolts?
A heavy hex nut machined from the same Inconel 600 bar (ASTM B166), unless the project specifies otherwise.
How do I stop Inconel 600 bolts galling?
Use an anti-seize compound on threads and nut faces, tighten at moderate speed, and do not reuse galled nuts.
Inconel 600 or Inconel 625 — which should I choose?
Inconel 600 is chosen for high-temperature oxidation, caustic and nuclear service. Inconel 625 is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026