Hastelloy C22 Socket Head Cap ScrewASTM B574 · ASME B18.3 · Manufacturer, stockist & exporter, India
Alloy C-22 · UNS N06022
A Hastelloy C22 socket head cap screw is a screw with a cylindrical head and hexagon socket, made from Hastelloy C22 to ASTM B574. Allen-type cap screws are used where the head must sit flush or space is tight.
- ASTM B574
- ASME B18.3
- 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 Socket Head Cap Screw?
- What it is
- A screw with a cylindrical head and hexagon socket
- Material
- ASTM B574
- Dimensions
- ASME B18.3 · DIN 912 / ISO 4762
- Grade
- Hastelloy C22 · UNS N06022
- Best at
- Mixed oxidising and reducing acids, and weld overlays
Hastelloy C22 Socket Head Cap Screw Specification
| Product | Hastelloy C22 Socket Head Cap Screw |
|---|---|
| Material standard | ASTM B574 |
| Dimensional standard | ASME B18.3 · DIN 912 / ISO 4762 |
| 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 Socket Head Cap Screw
Allen-type cap screws are used where the head must sit flush or space is tight.
- Hex socket drive
- ASME B18.3 · DIN 912
- Metric and inch
More on choosing: Socket head cap screw guide.
Hastelloy C22 Socket Head Cap Screw: Why C22 for socket head cap screws
Allen-type cap screws are used where the head must sit flush or space is tight. 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 Socket Head Cap Screw 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 Socket Head Cap Screw 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 Socket Head Cap Screws for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiHastelloy C22 Socket Head Cap Screw — questions buyers ask
DIN 912 and ISO 4762 — are they the same?
Yes, ISO 4762 replaced DIN 912 with the same main dimensions.
What nut is used with Hastelloy C22 socket head cap screws?
A nut in the same alloy, machined from ASTM B574 bar, unless the project specifies otherwise.
Which standard covers Hastelloy C22 socket head cap screws?
The material is ASTM B574; dimensions follow ASME B18.3 · DIN 912 / ISO 4762. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a Hastelloy C22 socket head cap screw?
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 socket head cap screws 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