SS 321 Stud BoltASTM A193 · ASME B18.31.2 · Manufacturer, stockist & exporter, India
AISI 321 · UNS S32100
An SS 321 stud bolt is a fully threaded rod supplied with two heavy hex nuts, made from SS 321 to ASTM A193 B8T. Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables.
- ASTM A193
- ASME B18.31.2
- 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 Stud Bolt?
- What it is
- A fully threaded rod supplied with two heavy hex nuts
- Material
- ASTM A193 B8T
- Dimensions
- ASME B18.31.2 · B16.5 bolting tables
- Grade
- SS 321 · UNS S32100
- Best at
- High-temperature service between 425 and 815 °C
SS 321 Stud Bolt Specification
| Product | SS 321 Stud Bolt |
|---|---|
| Material standard | ASTM A193 B8T |
| Dimensional standard | ASME B18.31.2 · B16.5 bolting tables |
| 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 Stud Bolt
Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables.
- Fully threaded, with two heavy hex nuts
- Length per ASME B16.5 flange class
- UNC up to 1", UN-8 above
More on choosing: Stud bolt guide.
SS 321 Stud Bolt: Why 321 for stud bolts
Stud bolts are the standard bolting for pipe flanges. Length is measured end-to-end excluding points, per ASME B16.5 bolting tables. 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 Stud Bolt 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 Stud Bolt 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 Stud Bolts for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 321 Stud Bolt — questions buyers ask
How is stud bolt length measured?
From first thread to first thread, excluding chamfered points, as tabulated in ASME B16.5.
What nut is used with SS 321 stud bolts?
ASTM A194 8T heavy hex nuts.
Which standard covers SS 321 stud bolts?
The material is ASTM A193 B8T; dimensions follow ASME B18.31.2 · B16.5 bolting tables. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 321 stud bolt?
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