| Business | Phone |
| Wilson Manufacturing 2500 N Main St, Rockford 61103 | (815) 964-8724 |
| Sterner Screw Machine 2500 N Main St, Rockford 61103 | (815) 962-8983 |
| Sharon Screw Products 1928 12th St, Rockford 61104 | (815) 397-5586 |
| Custom Screw Machine Products 2500 N Main St, Rockford 61103 | (815) 965-3655 |
| E-Z Machine 2810 Auburn St, Rockford 61101 | (815) 965-8186 |
| Forest City Machine Works 2136 12th Ave, Rockford 61104 | (815) 963-8808 |
| Nyclo Screw Machine Products 3610 Mansfield St, Rockford 61109 | (815) 229-7900 |
| Midwest Precision Products Inc 4374 S Bend Rd, Rockford 61109 | (815) 968-8000 |
| Midwest Screw Machine Products 2500 N Main St, Rockford 61103 | (815) 963-5556 |
| Marcellus Industries Inc 1117 Buchanan St, Rockford 61101 | (815) 962-3513 |
| Masters Yates Machine Co 2430 20th St, Rockford 61104 | (815) 399-6826 |
| Micro Screw Machine Co 2115 15th St, Rockford 61104 | (815) 397-2115 |