Super Duplex 2507 Heavy Hex NutASTM A276 · ASME B18.2.2 · Manufacturer, stockist & exporter, India
UNS S32750 · W.Nr 1.4410
A Super Duplex 2507 heavy hex nut is a thicker and wider hexagon nut for pressure bolting, made from Super Duplex 2507 to ASTM A276 / A479. 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.
- ASTM A276
- 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 a Super Duplex 2507 Heavy Hex Nut?
- What it is
- A thicker and wider hexagon nut for pressure bolting
- Material
- ASTM A276 / A479
- Dimensions
- ASME B18.2.2
- Grade
- Super Duplex 2507 · UNS S32750
- Best at
- Seawater and high-chloride service where strength also matters
Super Duplex 2507 Heavy Hex Nut Specification
| Product | Super Duplex 2507 Heavy Hex Nut |
|---|---|
| Material standard | ASTM A276 / A479 |
| Dimensional standard | ASME B18.2.2 |
| Sizes | M10 – M64 · ½" – 4" (others on request) |
| Threads | UNC · UN-8 · metric coarse |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
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.
Super Duplex 2507 Heavy Hex Nut: Why 2507 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 Super Duplex 2507, 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 | Duplex fasteners add strength in chloride service. Super Duplex 2507 is picked for seawater and high-chloride service where strength also matters. |
|---|---|
| Typical service | Offshore & subsea — Seawater injection, firewater and subsea piping. |
| Bolting | B7 (coated), B8M or duplex studs, as the project specifies |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Super Duplex 2507 Heavy Hex Nut Chemical Composition
| Element | Weight % |
|---|---|
| Chromium | 24.0 – 26.0 |
| Nickel | 6.0 – 8.0 |
| Molybdenum | 3.0 – 5.0 |
| Nitrogen | 0.24 – 0.32 |
| Copper | 0.50 max |
| Carbon | 0.030 max |
| Manganese | 1.20 max |
| Silicon | 0.80 max |
Super Duplex 2507 Heavy Hex Nut Mechanical Properties
| Solution-annealed plate & sheet | Value |
|---|---|
| Tensile strength | 795 MPa · 116 ksi |
| Yield strength 0.2% | 550 MPa · 80 ksi |
| Elongation | 15% |
| Hardness | 310 HB max |
Full chemistry, properties and equivalents are on the Super Duplex 2507 grade page.
Standards on this page
Other Super Duplex 2507 fasteners
Super Duplex 2507 Heavy Hex Nuts for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSuper Duplex 2507 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 Super Duplex 2507 heavy hex nuts?
A nut in the same alloy, machined from ASTM A276 / A479 bar, unless the project specifies otherwise.
Which standard covers Super Duplex 2507 heavy hex nuts?
The material is ASTM A276 / A479; dimensions follow ASME B18.2.2. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Super Duplex 2507 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.
Can you supply Super Duplex 2507 heavy hex nuts to NACE MR0175?
Yes. Super Duplex 2507 is listed in NACE MR0175 / ISO 15156-3 within its limits; state NACE compliance on the order and it is confirmed on the certificate.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026