Inconel 718 Heavy Hex NutUNS N07718 · ASME B18.2.2 · Manufacturer, trader & exporter, India
Alloy 718 · UNS N07718
An Inconel 718 heavy hex nut is a thicker and wider hexagon nut for pressure bolting. Finished fastener specification not asserted; may be machined from ASTM B637 bar (UNS N07718), 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.
- UNS N07718
- 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 718 Heavy Hex Nut?
- What it is
- A thicker and wider hexagon nut for pressure bolting
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B637 bar (UNS N07718), where applicable
- Dimensions
- ASME B18.2.2
- Grade
- Inconel 718 · UNS N07718
- Best at
- Very high strength at temperatures up to about 650 °C
Inconel 718 Heavy Hex Nut Specification
| Product | Inconel 718 Heavy Hex Nut |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B637 bar (UNS N07718), 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 718 Heavy Hex Nut: Why 718 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 718, 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 718 is picked for very high strength at temperatures up to about 650 °C. |
|---|---|
| Typical service | Oil & gas — Wellhead parts, hangers and high-strength bolting. |
| Bolting | B7 (coated), B8M or nickel-alloy studs in Inconel 718 (bar to ASTM B637, where applicable), as the project specifies |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Inconel 718 Heavy Hex Nut Chemical Composition
| Element | Weight % (producer reference) |
|---|---|
| Nickel (+Co) | 50.00 – 55.00 |
| Chromium | 17.00 – 21.00 |
| Iron | Balance |
| Niobium (+Ta) | 4.75 – 5.50 |
| Molybdenum | 2.80 – 3.30 |
| Titanium | 0.65 – 1.15 |
| Aluminium | 0.20 – 0.80 |
| Cobalt | 1.00 max |
Inconel 718 Heavy Hex Nut Mechanical Properties
| Specification | Product form | Condition | Requirement values |
|---|---|---|---|
| ASTM A1014/A1014M (A1014/A1014M-26) | bolting (product types pending) | as specified | As specified |
Numerical requirements are not shown until the current edition of each standard has been verified. Mechanical properties depend on product form, size, condition and heat treatment — state them on the purchase order.
Full chemistry, properties and equivalents are on the Inconel 718 grade page.
Standards on this page
Other Inconel 718 fasteners
Inconel 718 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 718 heavy hex nuts?
Usually a nut in the same alloy — it may be machined from ASTM B637 bar, where applicable; finished requirements are to the purchase specification or project drawing.
Which standard covers Inconel 718 heavy hex nuts?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B637 bar (UNS N07718), 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 718 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