ASTM A194
The ASTM A194 specification covers heavy hex nuts used in either high pressure or high temperature applications.
NOTE: ASTM A194 Grade 2H nuts are commonly substituted for ASTM A563 Grade DH. The strength of the A194 2H nut exceeds that of the A563 DH nut.
| Grade | Material | Proof Load |
|---|---|---|
| 2 | Carbon Steel | 150 |
| 2H | Medium Carbon Steel | 175 |
| 2HM | Medium Carbon Steel | 150 |
| 4 | Medium Carbon Steel | 175 |
| 7 | Medium Carbon Steel | 175 |
| 7M | Medium Carbon Steel | 150 |
| 8 | 304 Stainless Steel | 80 |
| 8M | 316 Stainless Steel | 80 |