| | Mariani Industries Inc General screw machine products, fasteners, coupling nuts & zinc plating | |
| | MascoTech Inc Nuts & tube fittings | |
| | McLaughlin Co Internal threaded fasteners, tapping plates, nut & washer assemblies, flange & lock nuts | |
| | Multifastener Tooling Fasteners, nuts, jigs & fixtures | |
| | National Railroad Supply Inc Railroad track supplies: bolts & nuts | |
| | Perigee Manufacturing Co Inc Hex nuts | |
| | Pittsburgh Welding & Forge Nuts, bolts & forgings | |
| | Production Threaded Parts Co Rolled acme thread & hexagon nuts | |
| | Quality Bending & Threading Machine shop: general machining, bolts & nuts | |
| | Ramco Specialties Inc Automotive & industrial nuts, bolts & fasteners | |
| | RB & W Corp Special & standard nuts & cold formed parts | |
| | S T G Nuts & cold formed products | |
| | South Erie Production Co Screw machine products, nuts & bolts | |
| | Taper Line Inc Threaded lock & hex nuts, cylinder rod eyes & clevises, ball screw & spindle nuts & barring lock nuts | |
| | Termax Corp Speed nuts, electrical terminals & wall fasteners | |
