Monel 400 Machine ScrewUNS N04400 · ASME B18.6.3 · Manufacturer, trader & exporter, India
Alloy 400 · UNS N04400
A Monel 400 machine screw is a small-diameter screw for equipment assembly. Finished fastener specification not asserted; material/feedstock may be supplied to ASTM B164 (UNS N04400), 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 N04400
- 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 a Monel 400 Machine Screw?
- What it is
- A small-diameter screw for equipment assembly
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B164 (UNS N04400), where applicable
- Dimensions
- ASME B18.6.3 · DIN 84 / 963 (legacy DIN)
- Grade
- Monel 400 · UNS N04400
- Best at
- Seawater, hydrofluoric acid and marine service
Monel 400 Machine Screw Specification
| Product | Monel 400 Machine Screw |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B164 (UNS N04400), 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.
Monel 400 Machine Screw: Why 400 for machine screws
Machine screws assemble instruments, panels and equipment. Pan, countersunk and cheese heads. In Monel 400, 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. Monel 400 is picked for seawater, hydrofluoric acid and marine service. |
|---|---|
| Typical service | Marine — Pump shafts, valves and seawater piping. |
| Bolting | B7 (coated), B8M or nickel-alloy studs in Monel 400 (bar to ASTM B164, where applicable), as the project specifies |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Monel 400 Machine Screw Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel (+Co) | As specified |
| Copper | As specified |
| Iron | As specified |
| Manganese | As specified |
| Carbon | As specified |
| Silicon | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM B127 for UNS N04400.
Monel 400 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 B127 for UNS N04400 — Annealed plate.
Full chemistry, properties and equivalents are on the Monel 400 grade page.
Standards on this page
Other Monel 400 fasteners
Monel 400 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 Monel 400 machine screws?
Usually a nut in the same alloy — it may be machined from ASTM B164 bar, where applicable; finished requirements are to the purchase specification or project drawing.
Which standard covers Monel 400 machine screws?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B164 (UNS N04400), 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 Monel 400 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