SS 321 Hex NutASTM A194 · ASME B18.2.2 · Manufacturer, trader & exporter, India
AISI 321 · UNS S32100
An SS 321 hex nut is a standard hexagon nut. ASTM A194 8T where specified; confirm grade and class in the purchase specification. Standard hex nuts for general bolting, to ASME B18.2.2 or ISO 4032 (DIN 934 is the legacy DIN reference).
- ASTM A194
- 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 SS 321 Hex Nut?
- What it is
- A standard hexagon nut
- Finished spec
- ASTM A194 8T where specified
- Material / feedstock
- Within the finished specification (A194 8T)
- Dimensions
- ASME B18.2.2 · DIN 934 (legacy DIN)
- Grade
- SS 321 · UNS S32100
- Best at
- High-temperature service between 425 and 815 °C
SS 321 Hex Nut Specification
| Product | SS 321 Hex Nut |
|---|---|
| Finished fastener specification | ASTM A194 8T where specified |
| Material / feedstock specification | Within the finished specification (A194 8T) |
| Dimensional standard | ASME B18.2.2 · DIN 934 (legacy DIN) |
| Manufacturing route | To the finished specification and purchase specification |
| 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 Hex Nut
Standard hex nuts for general bolting, to ASME B18.2.2 or ISO 4032 (DIN 934 is the legacy DIN reference).
- ASME B18.2.2 · DIN 934 (legacy DIN)
- Metric and inch
- Matching material to bolt
More on choosing: Hex nut guide.
SS 321 Hex Nut: Why 321 for hex nuts
Standard hex nuts for general bolting, to ASME B18.2.2 or ISO 4032 (DIN 934 is the legacy DIN reference). In SS 321, 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 | Stainless fasteners resist atmospheric and process corrosion. SS 321 is picked for high-temperature service between 425 and 815 °C. |
|---|---|
| Typical service | Aircraft exhaust — Manifolds, bellows and exhaust systems. |
| Bolting | ASTM A193 B8T studs with A194 8T nuts |
SS 321 Hex Nut Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Titanium | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S32100.
SS 321 Hex Nut Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | 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 A240 for UNS S32100 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 321 grade page.
Other SS 321 fasteners
SS 321 Hex Nut — questions buyers ask
Can I use a standard hex nut on flange studs?
Flange bolting normally specifies heavy hex nuts; standard hex nuts are for general joints.
What nut is used with SS 321 hex nuts?
ASTM A194 8T heavy hex nuts.
Which standard covers SS 321 hex nuts?
Finished fastener specification: ASTM A194 8T where specified. Material / feedstock: Within the finished specification (A194 8T). Dimensions: ASME B18.2.2 · DIN 934 (legacy DIN). State the finished specification, material and dimensions on your purchase order or project drawing.
What decides the price of a SS 321 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