B8M Cl.1Stud bolt
ASTM A193 Grade B8M Class 1
316 stainless — 2 to 3 % molybdenum gives it the pitting resistance 304 lacks. This is the grade for seawater, chlorides and offshore topsides.
- Base material
- Austenitic stainless steel, AISI 316
- Heat treatment condition
- Carbide solution treated
- Hardness, max
- 223 HBW / 96 HRB maximum
Service temperature
-254 °C+816 °C−273+900 °C
Austenitic stainless galls badly when tightened dry. Specify a PTFE coating or use an anti-seize compound on assembly.
Chemical composition
| Element | Min (% by weight) | Max (% by weight) |
|---|---|---|
| C | — | 0.08 |
| Mn | — | 2.00 |
| Si | — | 1.00 |
| P | — | 0.045 |
| S | — | 0.030 |
| Cr | 16.0 | 18.0 |
| Ni | 10.0 | 14.0 |
| Mo | 2.00 | 3.00 |
Mechanical properties
| Diameter | Tensile strength, min | Yield strength, min | Elongation, min | Reduction of area, min |
|---|---|---|---|---|
| ≤ 8 in (≤ M200) | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 30 % | 50 % |
Matching nuts
Recommended coatings
Equivalent grades
- AISI 316
- EN 1.4401 / X5CrNiMo17-12-2
- JIS SUS316
- ISO 3506 A4
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