| ACE | Alcoa |
| Arnco | ALR |
| Band-It | Bashlin |
| Bethea | Central Maloney |
| Continental | Copperweld® |
| Crouse Hinds Lighting | Dulmison |
| Elastimold | Fastenal |
| FOCAS | Gibbons |
| Halls | Homac |
| Hughes | Ilsco |
| Indiana Steel & Wire | Joslyn |
| Kuhlman | Lapp |
| Lindsey | Malton |
| Nehring | Newell Porcelain |
| Osh Kosh | Penn-Union |
| PDU | Precision |
| Preformed | Porcelain Products |
| P&R | Quazite |
| Reliable | Royal Switchgear |
| Sediver | Southwire |
| TEK | Turner |
| USCO | Utilco |