| Business | Phone |
| Commercial Steel Treating Corp 31440 Stephenson Hwy, Madison Heights 48071 | (248) 588-3300 |
| Engineered Heat Treat Inc 31271 Stephenson Hwy, Madison Heights 48071 | (248) 588-5141 |
| East-Lind Heat Treat Inc 32045 Dequindre Rd, Madison Heights 48071 | (248) 585-1415 |