| | Corver Engineering Co (Detroit, MI) | |
| | CPI Inc (Lapeer, MI) | |
| | Cullip Tool & Die Inc (Elkhart, IN) | |
| | D & F Tube & Fixture Inc (Clinton Twp, MI) | |
| | Danti Tool & Die Inc (Saginaw, MI) | |
| | Deak Machine & Tool Inc (Elkhart, IN) | |
| | Deckard Tool & Engineering Inc (Hope, IN) | |
| | DeWitt Tool & Die Inc (Upland, IN) | |
| | Dietool Engineering Co Inc (Grand Rapids, MI) | |
| | Draco Manufacturing Inc (Ashtabula, OH) | |
| | E M Enterprises (Mount Clemens, MI) | |
| | East Side Tool & Die Co Inc (Caseyville, IL) | |
| | Elca Engineering & Tool Co (Dexter, MI) | |
| | Engineered Materials Inc (Butler, IN) | |
| | Enmark Tool & Gage Co (Fraser, MI) | |
