Incoloy 800 / 800H / 800HT Stud BoltASTM B408 · ASME B18.31.2 · Manufacturer, stockist & exporter, India
Alloy 800 · UNS N08800 / N08810 / N08811
An Incoloy 800 / 800H / 800HT stud bolt is a fully threaded rod supplied with two heavy hex nuts, made from Incoloy 800 / 800H / 800HT to ASTM B408. Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables.
- ASTM B408
- ASME B18.31.2
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an Incoloy 800 / 800H / 800HT Stud Bolt?
- What it is
- A fully threaded rod supplied with two heavy hex nuts
- Material
- ASTM B408
- Dimensions
- ASME B18.31.2 · B16.5 bolting tables
- Grade
- Incoloy 800 / 800H / 800HT · UNS N08800
- Best at
- Furnaces, petrochemical heaters and high-temperature piping
Incoloy 800 / 800H / 800HT Stud Bolt Specification
| Product | Incoloy 800 / 800H / 800HT Stud Bolt |
|---|---|
| Material standard | ASTM B408 |
| Dimensional standard | ASME B18.31.2 · B16.5 bolting tables |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Stud Bolt
Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables.
- Fully threaded, with two heavy hex nuts
- Length per ASME B16.5 flange class
- UNC up to 1", UN-8 above
More on choosing: Stud bolt guide.
Incoloy 800 / 800H / 800HT Stud Bolt: Why 800 for stud bolts
Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables. In Incoloy 800 / 800H / 800HT, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Nickel-alloy fasteners match nickel-alloy flanges in corrosive or hot service. Incoloy 800 / 800H / 800HT is picked for furnaces, petrochemical heaters and high-temperature piping. |
|---|---|
| Typical service | Petrochemical — Steam-methane reformer and ethylene furnace piping. |
| Bolting | B7 (coated), B8M or nickel-alloy studs such as Incoloy 800 / 800H / 800HT from ASTM B408, as the project specifies |
Incoloy 800 / 800H / 800HT Stud Bolt Chemical Composition
| Element | Weight % |
|---|---|
| Nickel | 30.0 – 35.0 |
| Chromium | 19.0 – 23.0 |
| Iron | 39.5 min |
| Carbon | 0.10 max (800) · 0.05 – 0.10 (800H) |
| Aluminium | 0.15 – 0.60 |
| Titanium | 0.15 – 0.60 |
| Copper | 0.75 max |
| Manganese | 1.5 max |
Incoloy 800 / 800H / 800HT Stud Bolt Mechanical Properties
| Annealed plate | Value |
|---|---|
| Tensile strength | 520 MPa · 75 ksi (800) · 450 MPa · 65 ksi (800H) |
| Yield strength 0.2% | 205 MPa · 30 ksi (800) · 170 MPa · 25 ksi (800H) |
| Elongation | 30% |
Full chemistry, properties and equivalents are on the Incoloy 800 / 800H / 800HT grade page.
Standards on this page
Other Incoloy 800 / 800H / 800HT fasteners
Incoloy 800 / 800H / 800HT Stud Bolts for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiIncoloy 800 / 800H / 800HT Stud Bolt — questions buyers ask
How is stud bolt length measured?
From first thread to first thread, excluding chamfered points, as tabulated in ASME B16.5.
What nut is used with Incoloy 800 / 800H / 800HT stud bolts?
A nut in the same alloy, machined from ASTM B408 bar, unless the project specifies otherwise.
Which standard covers Incoloy 800 / 800H / 800HT stud bolts?
The material is ASTM B408; dimensions follow ASME B18.31.2 · B16.5 bolting tables. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Incoloy 800 / 800H / 800HT stud bolt?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026