ASTM A320 Grade B8T Stud Bolt, ASTM A320 Gr B8T Studs, Grade B8T Bolts, ASTM A320 Grade B8T Threaded Rod Suplier in Mumbai, India.
Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
This is the most common A320 bolt grade. A320 Grade B8C bolts, stud bolts, stud and threaded rod are manufactured from alloy steel with chromium, manganese, and molybdenum. The bolts undergo a heat treating process to reach their required mechanical properties. B8C threaded studs and short, headed bolts are readily available in the marketplace. These bolts are typically bought and sold in a plain, bare metal finish. B8C bolts are available through 2-1/2” in diameter. A320 Grade B8C bolts larger than 1/2″ diameter require a Charpy impact test.
Bolting A320 Grade B8T
| B8T |
AISI 321 Stainless Steel, Carbide Solution Treated |
ASTM A320 Grade B8T Chemical Composition
| Element |
Grade B8T |
| Carbon |
0.08 max |
| Manganese, max |
2.00 |
| Phosphorus, max |
0.045 |
| Sulfur, max |
0.030 |
| Silicon |
1.00 |
| Nickel |
9.0 - 12.0 |
| Chromium |
17.0 - 19.0 |
| Molybdenum |
- |
| Titanium |
5 x C, min |
ASTM A320 Grade B8T Mechanical Properties
| Grade |
Diameter, in. |
Tensile Strength, ksi |
Yield Strength ksi |
Elongation, % |
Reduction, % |
Hardness |
| B8T Class 1 |
1" and under |
75 |
30 |
30 |
50 |
223 HBW or 96 HRB |
| B8T Class 2 |
3/4 and under |
125 |
100 |
12 |
35 |
321 HBW or 35 HRC |
| Over 3/4 to 1, inclusive |
115 |
80 |
15 |
30 |
321 HBW or 35 HRC |
| Over 1 to 1 1/4", inclusive |
105 |
65 |
20 |
35 |
321 HBW or 35 HRC |
| Over 1 1/4" to 1 1/2", inclusive |
100 |
50 |
28 |
45 |
321 HBW or 35 HRC |
A320 Grade B8T Recommended Hardware
| Grade |
Nuts |
Washers |
| B8T |
ASTM A194 Grade B8T |
AISI 321 |