| 1 | Capital City Machine Shop Inc. | | USA |
| 2 | C&B Piping Inc. | | USA |
| 3 | Jindal Saw Limited | | USA |
| 4 | Jorgenson Metal Rolling & Forming Inc. | | USA |
| 5 | Dura-Bar | | USA |
| 6 | Tubular King USA | | USA |
| 7 | A & H Metals | | USA |
| 8 | Southland Pipe & Supply Inc. | | USA |
| 9 | Anaheim Welding & Fabrication Inc. | | USA |
| 10 | Penn Stainless Products Inc. | | USA |
| 11 | Reliable Source Inc. | | USA |
| 12 | Dynamic Fabrication Inc. | | USA |
| 13 | Vita Needle Co. | | USA |
| 14 | Kottler Metal Products Inc. | | USA |
| 15 | Air Dynamics Industrial Systems Corp. | | USA |
| 16 | Modern Welding Co. of Kentucky Inc. | | USA |
| 17 | AZCO Steel Company A Division of Bushwick Metals LLC | | USA |
| 18 | Sewickley Construction Products Inc. | | USA |
| 19 | United Pipe Nipple Company | | USA |
| 20 | Winchester Metals Inc. | | USA |
| 21 | Florida Strut LLC | | USA |
| 22 | Haitima Corp. | | USA |
| 23 | DuctileIronPiping.Com | | USA |
| 24 | Holloway Co. Inc. | | USA |
| 25 | Bushwick Metals LLC | | USA |
| 26 | Manning Enterprises | | USA |
| 27 | Piping Systems Inc. | | USA |
| 28 | Charlotte Pipe & Foundry Co. | | USA |
| 29 | Iron World Manufacturing LLC | | USA |
| 30 | Alloys International Inc. | | USA |
| 31 | Riggins Company | | USA |
| 32 | Diamond Plastics Corp. | | USA |
| 33 | Cooney Brothers Inc. | | USA |
| 34 | Hort Mfg. (1986) Ltd. | | USA |
