Inconel 825 Heavy Hex NutUNS N08825 · ASME B18.2.2 · Manufacturer, trader & exporter, India
Incoloy 825 · Alloy 825
An Inconel 825 heavy hex nut is a thicker and wider hexagon nut for pressure bolting. Finished fastener specification not asserted; may be machined from ASTM B425 bar (UNS N08825), where applicable; finished fastener requirements are to the purchase specification or project drawing. Heavy hex nuts go with stud bolts on flanges. They spread load better and resist thread stripping at high preload. Made to ASME B18.2.2.
See the Inconel 825 fasteners grade form page for standards and sizes.
- UNS N08825
- ASME B18.2.2
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an Inconel 825 Heavy Hex Nut?
- What it is
- A thicker and wider hexagon nut for pressure bolting
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B425 bar (UNS N08825), where applicable
- Dimensions
- ASME B18.2.2
- Grade
- Inconel 825 · UNS N08825
- Best at
- Sulphuric and phosphoric acid service, chloride stress-corrosion cracking
Inconel 825 Heavy Hex Nut Specification
| Product | Inconel 825 Heavy Hex Nut |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B425 bar (UNS N08825), where applicable |
| Dimensional standard | ASME B18.2.2 |
| Manufacturing route | May be machined from bar, where applicable |
| 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 Heavy Hex Nut
Heavy hex nuts go with stud bolts on flanges. They spread load better and resist thread stripping at high preload. Made to ASME B18.2.2.
- Thicker than standard hex nuts
- ASME B18.2.2
- Paired with A193 studs
More on choosing: Heavy hex nut guide.
Inconel 825 Heavy Hex Nut: Why 825 for heavy hex nuts
Heavy hex nuts go with stud bolts on flanges. They spread load better and resist thread stripping at high preload. Made to ASME B18.2.2. In Inconel 825, 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. Inconel 825 is picked for sulphuric and phosphoric acid service, chloride stress-corrosion cracking. |
|---|---|
| Typical service | Sulphuric & phosphoric acid plants — Tank linings, agitators, heat-exchanger baffles in fertiliser and acid production. |
| Bolting | B7 (coated), B8M or nickel-alloy studs in Inconel 825 (bar to ASTM B425, where applicable), as the project specifies |
Inconel 825 Heavy Hex Nut Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Nickel | As specified |
| Iron | As specified |
| Chromium | As specified |
| Molybdenum | As specified |
| Copper | As specified |
| Titanium | As specified |
| Carbon | 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 B424 / B423 / B564 for UNS N08825.
Inconel 825 Heavy Hex Nut 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 B424 / B423 / B564 for UNS N08825 — Annealed.
Full chemistry, properties and equivalents are on the Inconel 825 grade page.
Standards on this page
Other Inconel 825 fasteners
Inconel 825 Heavy Hex Nut — questions buyers ask
Why use heavy hex nuts on flanges?
They provide more thread engagement and bearing area for the high preload flange joints need.
What nut is used with Inconel 825 heavy hex nuts?
Usually a nut in the same alloy — it may be machined from ASTM B425 bar, where applicable; finished requirements are to the purchase specification or project drawing.
Which standard covers Inconel 825 heavy hex nuts?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B425 bar (UNS N08825), where applicable. Dimensions: ASME B18.2.2. State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a Inconel 825 heavy hex nut?
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