The primary material specification of ASTM A193 grade B8 class 2 includes details about genuine stainless steel and anti-corrosion fasteners. They are strain-hardened and carbide solution-treated 304 stainless steel with a hardness
of 35 HRC max and 125 ksi yielding 100 ksi. These fasteners are mainly used in chemical construction applications, sewage treatment, wind farms, and shipbuilding.
A193 Grade B8 Class 2
| B8 Class 2 |
Stainless steel, AISI 304, carbide solution treated, strain hardened |
Mechanical properties
| Size |
Tensile ksi, min |
Yield ksi, min |
Elong %, min |
RA % min |
HBW |
Rockwell |
| Up to 3/4 |
125 |
100 |
12 |
35 |
321 Max |
35 HRC max |
| 7/8 - 1 |
115 |
80 |
15 |
35 |
| 1-1/8 - 1-1/4 |
105 |
65 |
20 |
35 |
| 1-3/8 - 1-1/2 |
100 |
50 |
28 |
45 |
Chemical properties
| Element |
B8 (AISI 304) |
| Carbon |
0.08% max |
| Manganese |
2.00% max |
| Phosphorus, max |
0.045% |
| Sulfur, max |
0.03% |
| Silicon |
1.00% max |
| Chromium |
18.0 - 20.0% |
| Nickel |
8.0 - 11.0% |
| Molybdenum |
- |
Compatible hardware
| Bolt Grade |
Nut |
Washers |
| B8 Class 2 |
A194 Grade 8 |
SS304 |
