| PR11-4 | Heat Treatment Spec | Heat Treat |
| Superseded by: None | Superseded By: None | |
| Selected sector: SP-SSSD | Date added: | |
| SupplierNumber | SupplierName | State | CountryName |
| 90075269 | ALBERT INDUSTRIES LTD | CA | United States |
| 90024576 | ASTRO ALUMINUM TREATING CO INC | CA | United States |
| 90049888 | DICKSON TESTING CO INC | CA | United States |
| 90043654 | NEWTON HEAT TREATING INC | CA | United States |
| 90059086 | Solar Atmospheres (formerly Certified Metal Craft) | CA | United States |