| ABC Company | 1234 |
| AD Tubi | 104 |
| Alabama Heat Exchanger | 1008 |
| Ascent Tubular Products | 1007 |
| Astro Arc Polysoude | 102 |
| Belleville International | 304 |
| Bendel Tank & Heat Exchanger | 905 |
| Brask Inc. | 504 |
| CG Thermal | 1009 |
| Chem Fabrication | 801 |
| Chicago Pneumatic Tool | 108 |
| CleanCo Systems | 604 |
| Climax Portable | 1004 |
| Curran International | 1005 |
| Curtiss-Wright | 601 |
| Cust-o-Fab | 603 |
| Delta Tee International | 405 |
| Dunn Heat Exchangers | 602 |
| E. Bachiller | 1012 |
| EFCO | 101 |
| Elliott Tool Technologies | 305 |
| Energy Exchanger | 904 |
| Equipment Group | 500 |
| FIC Spa | 201 |
| Flexitallic | 203 |
| Forged Components Inc | 1001 |
| Gaskets Resources/Durlon Sealing Solutions | 205 |
| Graham Corporation | 103 |
| Gulf Coast Engineered Solutions | 404 |
| Gulf Coast Exchanger | 605 |
| Han & Clay | 105 |
| Heat Transfer Research, Inc. | 1010 |
| Heat Transfer Specialists, Inc. | 501 |
| Heat Transfer Tubular Products | 701 |
| Hytorc Industrial Bolting Systems | 106 |
| Izomax | 109 |
| Koch | 401 |
| Looking Cube | 9999 |
| Looking Cube | 9999 |
| Marks Brothers Inc. | 1002 |
| Neotiss | 110 |
| Nippon Yakin | 1003 |
| Ohmstede | 403 |
| Partners Specialties Inc. | 202 |
| Patriot Bolt & Supply | 802 |
| Perficon Steel | 502 |
| Plastocor Inc. | 901 |
| Southern Heat Exchangers | 805 |
| SPX | 1006 |
| Stone Age Tools | 111 |
| Super Radiator Coils | 112 |
| Superior Plant Rentals | 402 |
| Taprogge | 505 |
| Teadit | 803 |
| Tex Fin Inc. | 204 |
| Thermal Engineering Internaional | 301 |
| Thermon | 1011 |
| Thomas C. Wilson | 902 |
| Tubacex | 503 |
| USA Industries | 107 |
| Vahterus | 302 |
| Ward Vessel | 804 |
| Webco Industries | 704 |