| Pittsburgh Precision Turned Products, LLC Milling, Turning, Grinding, Finishing, Assembly · ISO 9001 | Pittsburgh, PA | MillingTurningGrindingFinishingAssembly | ISO 9001 |
| Pre-Mach Inc Milling, Welding, Grinding, Finishing | York, PA | MillingWeldingGrindingFinishing | - |
| Precision Defense Services Inc Milling, Turning, Waterjet, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100 | Irwin, PA | MillingTurningWaterjetWeldingEDMGrindingFinishing | ISO 9001, AS9100 |
| Prieto Machine Co Inc Milling, Turning, Bending, Welding, EDM · ISO 9001, AS9100 | Warminster, PA | MillingTurningBendingWeldingEDM | ISO 9001, AS9100 |
| Reynolds Machine Co Milling, Turning · AS9100 | Ruffs Dale, PA | MillingTurning | AS9100 |
| RGS Machine Inc Milling, Turning, Swiss · ISO 9001 | Folsom, PA | MillingTurningSwiss | ISO 9001 |
| Rinval Manufacturing Laser | Indiana, PA | Laser | - |
| Schred Machine Company, Inc Milling, Turning · AS9100 | Warminster, PA | MillingTurning | AS9100 |
| Sepco Erie Milling, Turning, Stamping · ISO 9001 | Erie, PA | MillingTurningStamping | ISO 9001 |
| Specialty Roller and Machine Inc Milling, Turning, Grinding | Berwick, PA | MillingTurningGrinding | - |
| Starlite Diversified Inc Milling, Turning, Welding, EDM, Grinding | Meadville, PA | MillingTurningWeldingEDMGrinding | - |
| Starn Tool & Manufacturing Company Milling, Turning, EDM, Grinding, Finishing · ISO 9001, ITAR | Meadville, PA | MillingTurningEDMGrindingFinishing | ISO 9001, ITAR |
| Tech Met Inc Milling, Finishing · NADCAP | Glassport, PA | MillingFinishing | NADCAP |
| The Flinchbaugh Company, Inc Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly | Manchester, PA | MillingTurningWeldingEDMGrindingFinishingAssembly | - |
| Thomas W Springer Inc Milling, Turning, Swiss, Welding, Grinding · ISO 9001 | Landenberg, PA | MillingTurningSwissWeldingGrinding | ISO 9001 |
| Three Rivers Precision, LLC Welding, Assembly · ISO 9001 | East Liberty, PA | WeldingAssembly | ISO 9001 |
| Uber Machining Services LLC Milling, Turning, Finishing | Pittsburgh, PA | MillingTurningFinishing | - |
| US Axle, Inc Milling, Forging, Grinding | Pottstown, PA | MillingForgingGrinding | - |
| Whitmer Industries LLC Milling, Turning, Finishing · ISO 9001, ITAR | Baden, PA | MillingTurningFinishing | ISO 9001, ITAR |