Inconel 825 Socket Head Cap ScrewUNS N08825 · ASME B18.3 · Manufacturer, trader & exporter, India
Incoloy 825 · Alloy 825
An Inconel 825 socket head cap screw is a screw with a cylindrical head and hexagon socket. 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. Allen-type cap screws are used where the head must sit flush or space is tight.
See the Inconel 825 fasteners grade form page for standards and sizes.
- UNS N08825
- 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 an Inconel 825 Socket Head Cap Screw?
- What it is
- A screw with a cylindrical head and hexagon socket
- Finished spec
- Not asserted
- Material / feedstock
- ASTM B425 bar (UNS N08825), where applicable
- Dimensions
- ASME B18.3 · ISO 4762 · DIN 912 (legacy DIN)
- Grade
- Inconel 825 · UNS N08825
- Best at
- Sulphuric and phosphoric acid service, chloride stress-corrosion cracking
Inconel 825 Socket Head Cap Screw Specification
| Product | Inconel 825 Socket Head Cap Screw |
|---|---|
| Finished fastener specification | Not asserted |
| Material / feedstock specification | ASTM B425 bar (UNS N08825), where applicable |
| Dimensional standard | ASME B18.3 · ISO 4762 · DIN 912 (legacy DIN) |
| 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 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.
Inconel 825 Socket Head Cap Screw: Why 825 for socket head cap screws
Allen-type cap screws are used where the head must sit flush or space is tight. 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 Socket Head Cap Screw 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 Socket Head Cap Screw 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 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 Inconel 825 socket head cap screws?
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 socket head cap screws?
Finished fastener specification: Not asserted. Material / feedstock: ASTM B425 bar (UNS N08825), where applicable. Dimensions: ASME B18.3 · ISO 4762 · DIN 912 (legacy DIN). State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a Inconel 825 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.
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