| | Cambria Tool & Machine Inc (Hillsdale, MI) | |
| | Cameron Tool Corp (Lansing, MI) | |
| | Cardinal Tool & Die Service (South Bend, IN) | |
| | Carnation Machine & Tool Inc (Alliance, OH) | |
| | Carroll Tool & Die Co (Macomb, MI) | |
| | Casey Tool & Die Inc (Dowagiac, MI) | |
| | Champion Tool & Engineering (Mishawaka, IN) | |
| | Chipsco Inc (Meadville, PA) | |
| | Circle Engineering Inc (Sterling Hts, MI) | |
| | Clifty Engineering & Tool Co (Madison, IN) | |
| | Clover Precision Tool Inc (Hatfield, PA) | |
| | Compacting Tooling Inc (Mc Keesport, PA) | |
| | Concorde Tools Inc (Mchenry, IL) | |
| | Convex Mold Inc (Sterling Hts, MI) | |
| | Cook, Kenneth B Co Inc (Traverse City, MI) | |
