Hastelloy C22 Heavy Hex NutASTM B574 · ASME B18.2.2 · Manufacturer, stockist & exporter, India
Alloy C-22 · UNS N06022
A Hastelloy C22 heavy hex nut is a thicker and wider hexagon nut for pressure bolting, made from Hastelloy C22 to ASTM B574. 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 B574
- 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 Hastelloy C22 Heavy Hex Nut?
- What it is
- A thicker and wider hexagon nut for pressure bolting
- Material
- ASTM B574
- Dimensions
- ASME B18.2.2
- Grade
- Hastelloy C22 · UNS N06022
- Best at
- Mixed oxidising and reducing acids, and weld overlays
Hastelloy C22 Heavy Hex Nut Specification
| Product | Hastelloy C22 Heavy Hex Nut |
|---|---|
| Material standard | ASTM B574 |
| 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.
Hastelloy C22 Heavy Hex Nut: Why C22 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 Hastelloy C22, 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. Hastelloy C22 is picked for mixed oxidising and reducing acids, and weld overlays. |
|---|---|
| Typical service | Chemical processing — Equipment seeing both oxidising and reducing conditions. |
| Bolting | B7 (coated), B8M or nickel-alloy studs such as Hastelloy C22 from ASTM B574, as the project specifies |
| Sour service | Listed in NACE MR0175 / ISO 15156-3 within its limits — state it on the order |
Hastelloy C22 Heavy Hex Nut Chemical Composition
| Element | Weight % |
|---|---|
| Nickel | Balance |
| Chromium | 20.0 – 22.5 |
| Molybdenum | 12.5 – 14.5 |
| Iron | 2.0 – 6.0 |
| Tungsten | 2.5 – 3.5 |
| Cobalt | 2.5 max |
| Carbon | 0.015 max |
| Manganese | 0.50 max |
Hastelloy C22 Heavy Hex Nut Mechanical Properties
| Solution-annealed plate & sheet | Value |
|---|---|
| Tensile strength | 690 MPa · 100 ksi |
| Yield strength 0.2% | 310 MPa · 45 ksi |
| Elongation | 45% |
Full chemistry, properties and equivalents are on the Hastelloy C22 grade page.
Standards on this page
Other Hastelloy C22 fasteners
Hastelloy C22 Heavy Hex Nuts for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiHastelloy C22 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 Hastelloy C22 heavy hex nuts?
A nut in the same alloy, machined from ASTM B574 bar, unless the project specifies otherwise.
Which standard covers Hastelloy C22 heavy hex nuts?
The material is ASTM B574; 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 Hastelloy C22 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 Hastelloy C22 heavy hex nuts to NACE MR0175?
Yes. Hastelloy C22 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