| HPHickman Pipe and Tube Corporation | Hickman | KY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| HTHydro Tube Enterprises, INC. (0247100874) | Oberlin | OH | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| ITIpsco Tubulars INC. | Geneva | NE | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| ITIpsco Tubulars Incorporated | Camanche | IA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| JMJohn Maneely CO Wheatland Tube Div - Mill Street | Sharon | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KEKirk Eastern | Gardner | MA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KIK&k Iron Works | Mccook | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| KKnickerbocker | Carlstadt | NJ | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LSLaclede Steel | Vandalia | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LJLock Joint Tube - Tennessee | Chattanooga | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| LSLtv Steel Company Counce Plant | Counce | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MFMaeco Fabrication INC | Grand Bay | AL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MUMarcegaglia USA | Greenville | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MTMaverick Tube Corporation | Ferndale | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MGMccoy Global USA | Broussard | LA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MTMercury Tube - 3211 W Bear Creek Dr | Englewood | CO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
 Metal Culverts INC Florida Div | Clearwater | FL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NMNational Metalwares L.p. | Aurora | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| NTNucor Tubular Products | Bedford Park | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OIOakley Industries INC | Niles | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| OUOdermath USA INC | Naperville | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PTPacific Tube CO | Los Angeles | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PIParagon Industries INC / Paragon Industries INC | Sapulpa | OK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| PSPtc Seamless Tube CORP | Hopkinsville | KY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RDRays Dies and Tubing | Swanton | VT | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RSRiver Steel INC | La Crosse | WI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RMRosedale Marketing Dba Port-a Stall | Erie | CO | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| RTRubicon Technology | Batavia | IL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SIScot Industries, INC. | Talladega | AL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SCShasta Capt Haz Waste Operation | Aliquippa | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSpacerak | Marlette | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPStainless Piping Specialists | Omro | WI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SFSteel Fab | Anchorage | AK | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPSteel Pipe Fabricators, LLC | Norcross | GA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| S7Subsea 7 Ingleside | Ingleside | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SISummit Iron Works | Indiana | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SPSwagelok Processing Corporation/koppel Facility | Koppel | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SSSxp Schulz Xtruded Products LLC | Hernando | MS | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TCTag Contructors | Hammond | IN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TCTenaris Coiled Tubes - Seacat | Houston | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TITepco INC | South Lyon | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TATi Automotive Systems | Auburn Hills | MI | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TFTi Fluid Systems | Tallassee | AL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TGTi Group Automotive System, LLC | Cynthiana | KY | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TWToro Wheel Horse Prods. INC. | South Bend | IN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TTTrent Tube | Carrollton | GA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TPTubular Processing Houston Operations | Houston | TX | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TPTubular Products Company, INC. | Birmingham | AL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| UEUnion Elec Steel Carnegie Plant | Carnegie | PA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| UIUnited Industries | Selmer | TN | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
