| Business | Phone |
| Reino Tool & Mfg Co 3668 N Elston Ave, Chicago 60618 | (773) 588-5800 |
| U & S Machined Products Co 4110 N California Ave, Chicago 60618 | (847) 678-7340 |
| Nelson & Lavold Mfg Co 1530 N Halsted St, Chicago 60622 | (312) 943-6300 |
| Wilmette Screw Products 4432 N Elston Ave, Chicago 60630 | (773) 725-2626 |
| Wunar Automatic Screw Products 5214 W Lawrence Ave, Chicago 60630 | (773) 283-6663 |
| Magnus Screw Products Co 1818 N Latrobe Ave, Chicago 60639 | (773) 889-2344 |
| Wrightwood Precision Prods Co 4920 W Bloomingdale Ave, Chicago 60639 | (773) 237-2737 |
| Precision Screw Machining Co 3511 N Kenton Ave, Chicago 60641 | (773) 205-4280 |
| Ramm Machine & Mfg Co 4447 W Belmont Ave, Chicago 60641 | (773) 736-3060 |
| Tool-Matic Corp 219 N Justine St, Chicago 60607 | (312) 421-3044 |
| Illinois National Mfr 2544 W Madison St, Chicago 60612 | (773) 274-3770 |
| Hamilton-Pax Inc 3745 N Kedzie Ave, Chicago 60618 | (773) 539-8138 |