Incoloy 800 / 800H / 800HT Machine ScrewUNS N08800 · ASME B18.6.3 · Manufacturer, trader & exporter, India
Alloy 800 · UNS N08800 / N08810 / N08811
An Incoloy 800 / 800H / 800HT machine screw is a small-diameter screw for equipment assembly. Finished fastener specification not asserted; material/feedstock may be supplied to ASTM B408 (UNS N08800), where applicable; manufacturing route and finished fastener requirements are to the purchase specification or project drawing. Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- UNS N08800
- ASME B18.6.3
- 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 Machine Screw?
- What it is
- A small-diameter screw for equipment assembly
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B408 (UNS N08800), where applicable
- Dimensions
- ASME B18.6.3 · DIN 84 / 963 (legacy DIN)
- Grade
- Incoloy 800 / 800H / 800HT · UNS N08800
- Best at
- Furnaces, petrochemical heaters and high-temperature piping
Incoloy 800 / 800H / 800HT Machine Screw Specification
| Product | Incoloy 800 / 800H / 800HT Machine Screw |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B408 (UNS N08800), where applicable |
| Dimensional standard | ASME B18.6.3 · DIN 84 / 963 (legacy DIN) |
| Manufacturing route | Route dependent on product design and purchase specification |
| Project / purchase specification | Yes — finished fastener requirements are to the purchase specification or project drawing |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI (as specified in the PO) · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 or 3.2 on request / as specified in the PO |
When to Choose a Machine Screw
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads.
- Pan, flat and cheese heads
- Slotted or Phillips
- M2 – M10 typical
More on choosing: Machine screw guide.
Incoloy 800 / 800H / 800HT Machine Screw: Why 800 for machine screws
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads. 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 in Incoloy 800 / 800H / 800HT (bar to ASTM B408, where applicable), as the project specifies |
Incoloy 800 / 800H / 800HT Machine Screw Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel | As specified |
| Chromium | As specified |
| Iron | As specified |
| Carbon | As specified |
| Aluminium | As specified |
| Titanium | As specified |
| Copper | As specified |
| Manganese | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B409 for UNS N08800 / N08810.
Incoloy 800 / 800H / 800HT Machine Screw Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM B409 for UNS N08800 / N08810 — Annealed plate.
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 Machine Screw — questions buyers ask
What sizes are machine screws?
Usually small diameters, M2 to M10 or #2 to 3/8".
What nut is used with Incoloy 800 / 800H / 800HT machine screws?
Usually a nut in the same alloy — it may be machined from ASTM B408 bar, where applicable; finished requirements are to the purchase specification or project drawing.
Which standard covers Incoloy 800 / 800H / 800HT machine screws?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B408 (UNS N08800), where applicable. Dimensions: ASME B18.6.3 · DIN 84 / 963 (legacy DIN). State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a Incoloy 800 / 800H / 800HT machine screw?
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 or 3.2 certificates available on request / as specified in the PO; dimensional reports as required. PMI can be arranged depending on product and requirements, as specified in the PO.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026