Monel 400 U-boltUNS N04400 · MSS SP-58 / manufacturer standard · Manufacturer, trader & exporter, India
Alloy 400 · UNS N04400
A Monel 400 u-bolt is a U-shaped bolt for clamping pipes to supports. 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. U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg.
- UNS N04400
- MSS SP-58 / manufacturer standard
- 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 U-bolt?
- What it is
- A U-shaped bolt for clamping pipes to supports
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B164 (UNS N04400), where applicable
- Dimensions
- MSS SP-58 / manufacturer standard
- Grade
- Monel 400 · UNS N04400
- Best at
- Seawater, hydrofluoric acid and marine service
Monel 400 U-bolt Specification
| Product | Monel 400 U-bolt |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B164 (UNS N04400), where applicable |
| Dimensional standard | MSS SP-58 / manufacturer standard |
| 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 an U-bolt
U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg.
- Sized to pipe NPS
- With nuts and plates
- Matching or isolated material
More on choosing: U-bolt guide.
Monel 400 U-bolt: Why 400 for u-bolts
U-bolts hold pipes to supports and structures. Sized by pipe NPS with a threaded length on each leg. 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 U-bolt 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 U-bolt 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 U-bolt — questions buyers ask
Should U-bolts match the pipe material?
Use the same alloy, or an isolating sleeve, to avoid galvanic corrosion between pipe and bolt.
What nut is used with Monel 400 u-bolts?
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 u-bolts?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B164 (UNS N04400), where applicable. Dimensions: MSS SP-58 / manufacturer standard. State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a Monel 400 u-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 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