| NPNaylor Pipe CO | Chicago | IL | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| NSNippon Sharyo Manufacturing LLC | Rochelle | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PSPenn State Special Metals LLC | Koppel | PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PJPhillips & Johnston INC Dba River Rock Fabrication | Grand Rapids | MI | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PEPlymouth Engineered Shapes | Hopkinsville | KY | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PTPlymouth Tube Company | Winamac | IN | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PTPlymouth Tube Company | Eupora | MS | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| PPPrimus Pipe and Tube INC | Wildwood | FL | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| RCRepublic Conduit INC. (pka Maverick C&p Inc.) | Cedar Springs | GA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| RMRoyal Metal Products, INC. | Temple | GA | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| STSalem Tube Mfg | Greenville | PA | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| SASanoh America Archbold Facility | Archbold | OH | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| SSSeah Steel USA | Houston | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
Skyline Steel LLC. - Geo Pomona | Pomona | CA | Primary Metal Manufacturing331210 | 1-19 | ◐ LIKELY ACTIVE |
| SCSoutheast Culvert INC. | Winder | GA | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| SFSystems Fab & Machine, INC. | El Dorado | AR | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| TTTapco Tube Co/meadville | Meadville | PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| TTTarter Tube | Dunnville | KY | Primary Metal Manufacturing331210 | 100-499 | ◐ LIKELY ACTIVE |
| TBTenaris Bay City | Bay City | TX | Primary Metal Manufacturing331210 | 500+ | ◐ LIKELY ACTIVE |
| TTThe Troxel Company | Moscow | TN | Plastics and Rubber Products Manufacturing326199 | 20-99 | ◐ LIKELY ACTIVE |
| TMTru-line Manufacturing Company | Decatur | AL | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| VTVallourec Tube Alloy | Houston | TX | Primary Metal Manufacturing331210 | 20-99 | ◐ LIKELY ACTIVE |
| WIWebco Industries, Star Center Tube | Sand Springs | OK | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| WFWyman-gordon Forgings INC | Houston | TX | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| AAccellent | Salem | VA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ATAk Tube LLC | Columbus | IN | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ATAllied Tube and Conduit | Merrillville | IN | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ATAllied Tube & Conduit Corporation | Liberty | TX | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ACArntzen CORP | Woodstock | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| ACArntzen CORP | Rockford | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| AIAzco INC | Neenah | WI | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| BMBerry Metal CO | Zelienople | PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| CDControl Devices | Fenton | MO | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| CSCorey Steel CO | Cicero | IL | Primary Metal Manufacturing331110 | — | ◐ LIKELY ACTIVE |
| DTDakota Tube Building 3 | Watertown | SD | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| DPDura-bond Pipe 1 LLC | Mckeesport | PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| HSHanna Steel CORP | Northport | AL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| HSHanna Steel CORP | Pekin | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| HIHofmann Ind Inc/sinking Spring | Sinking Spring | PA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| JCJeffrey Chain Corporation | Morristown | TN | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| JZJohn Zink Apache Facility | Tulsa | OK | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| KCKawneer Company, INC | Hernando | MS | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| KTK Tube Corporation | Poway | CA | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MMMid-west Manufacturing CO | Chicago Heights | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| MMMisa Metal Fabricating INC | Louisville | KY | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| NPNorthwest Pipe CO | Washington | WV | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| NPNorthwest Pipe Company | Portland | OR | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| NTNucor Tublar Products INC. | Birmingham | AL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| NTNucor Tubular Products INC | Marseilles | IL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |
| OSOutokumpu Stainless Pipe INC. | Wildwood | FL | Primary Metal Manufacturing331210 | — | ◐ LIKELY ACTIVE |