SS 321 Hex NutASTM A193 · ASME B18.2.2 · Manufacturer, stockist & exporter, India
AISI 321 · UNS S32100
An SS 321 hex nut is a standard hexagon nut, made from SS 321 to ASTM A193 B8T. Standard hex nuts for general bolting, to ASME B18.2.2 or DIN 934 / ISO 4032.
- ASTM A193
- 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
- Material
- ASTM A193 B8T
- Dimensions
- ASME B18.2.2 · DIN 934
- 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 |
|---|---|
| Material standard | ASTM A193 B8T |
| Dimensional standard | ASME B18.2.2 · DIN 934 |
| 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 Hex Nut
Standard hex nuts for general bolting, to ASME B18.2.2 or DIN 934 / ISO 4032.
- ASME B18.2.2 · DIN 934
- 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 DIN 934 / ISO 4032. 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
| Element | Weight % |
|---|---|
| Chromium | 17.0 – 19.0 |
| Nickel | 9.0 – 12.0 |
| Titanium | 5 × (C + N) min, 0.70 max |
| Carbon | 0.08 max |
| Manganese | 2.00 max |
| Silicon | 0.75 max |
| Nitrogen | 0.10 max |
| Phosphorus | 0.045 max |
SS 321 Hex Nut Mechanical Properties
| Annealed plate & sheet | Value |
|---|---|
| Tensile strength | 515 MPa · 75 ksi |
| Yield strength 0.2% | 205 MPa · 30 ksi |
| Elongation | 40% |
| Hardness | 217 HB max |
Full chemistry, properties and equivalents are on the SS 321 grade page.
Other SS 321 fasteners
SS 321 Hex Nuts for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 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?
The material is ASTM A193 B8T; dimensions follow ASME B18.2.2 · DIN 934. Always state both on your purchase order, with the edition if your project specifies one.
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 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