ASTM A320
ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature applications. Often used for pressure vessels and pipe flanges.
Strengths
| Grade | Tensile (ksi) | Yield (ksi) |
|---|---|---|
| L7 | 125 | 105 |
| L43 | 125 | 105 |
| B8 Class 1 | 75 | 30 |
| B8 Class 2 | 100 - 125 | 50 - 100 |
| B8M Class 1 | 75 | 30 |
| B8M Class 2 | 90 - 110 | 50 - 95 |
*Class 2 denotes a strain hardening process applied
Recommended Hardware
| Grade | Material | Matching Nut | Matching Washer |
|---|---|---|---|
| L7 | Alloy Steel | A194 Grade 4 or 7 | F436 |
| L43 | Alloy Steel | A194 Grade 4 or 7 | F436 |
| B8 | 304 S/S | A194 GR8 | 304 Stainless Steel |
| B8 Class 2 | 304 S/S Strain Hardened | A194 GR8 Cl 2 | 304 Stainless Steel |
| B8M | 316 Stainless Steel | A194 GR8M | 316 Stainless Steel |
| B8M Class 2 | 316 S/S Strain Hardened | A194 GR8M Cl 2 | 316 Stainless Steel |