| Enhanced Technologies, Inc Milling, Turning, Stamping, Grinding | Palmyra, PA | MillingTurningStampingGrinding | - |
| Erie Plating Co Finishing · ISO 9001, ITAR, NADCAP | Erie, PA | Finishing | ISO 9001, ITAR, NADCAP |
| Exact Machine Service Inc Milling, Turning | York, PA | MillingTurning | - |
| Gamlet Inc Milling, Laser, Bending, Welding, Stamping, Grinding, Finishing | York, PA | MillingLaserBendingWeldingStampingGrindingFinishing | - |
| Global Affinity Inc Laser, Bending, Welding | Bristol, PA | LaserBendingWelding | - |
| Golis Machine Incorporated Milling, Turning, EDM · ISO 9001, AS9100, ITAR | Montrose, PA | MillingTurningEDM | ISO 9001, AS9100, ITAR |
| Grand Valley Manufacturing Co Milling, Turning, Bending, Welding | Titusville, PA | MillingTurningBendingWelding | - |
| Great Lakes Automation Services Inc Welding, Assembly · ITAR | Mc Kean, PA | WeldingAssembly | ITAR |
| Great Lakes Metal Finishing Inc Finishing | Erie, PA | Finishing | - |
| H & H Machine Product Milling, Turning | Erie, PA | MillingTurning | - |
| I Auman Machine Co Inc Milling, Turning, Welding | Lebanon, PA | MillingTurningWelding | - |
| J.V. Manufacturing Co Inc Stamping, EDM, Grinding · ISO 9001 | Natrona Heights, PA | StampingEDMGrinding | ISO 9001 |
| Jennison Corp Turning, Laser, EDM | Carnegie, PA | TurningLaserEDM | - |
| JMT Machine Company Milling, Turning, Assembly | Huntingdon Valley, PA | MillingTurningAssembly | - |
| John R. Bromiley Company Inc Milling, Turning, Swiss | Chalfont, PA | MillingTurningSwiss | - |
| Kelley-Tron Machine Co Milling, Turning | Harrisburg, PA | MillingTurning | - |
| Lamjen Inc Milling, Turning, Welding, Stamping, Casting · ISO 9001 | Erie, PA | MillingTurningWeldingStampingCasting | ISO 9001 |
| Liberty Manufacturing LLC Milling | Levittown, PA | Milling | - |
| Machining Concepts Inc Milling, Turning, Casting · AS9100, ISO 13485 | Erie, PA | MillingTurningCasting | AS9100, ISO 13485 |
| Mason Dixon Fabrication LLC Milling, Turning, Welding, Assembly | Hanover, PA | MillingTurningWeldingAssembly | - |
| Max Machine Milling, Turning, Laser, Waterjet, Welding, Grinding, Finishing · ISO 9001 | Elizabethtown, PA | MillingTurningLaserWaterjetWeldingGrindingFinishing | ISO 9001 |
| Max Machining LLC Milling, Turning, Laser, Bending · ITAR, CMMC | Telford, PA | MillingTurningLaserBending | ITAR, CMMC |
| Metal Integrity, Inc Milling, Laser, Welding | Bellefonte, PA | MillingLaserWelding | - |
| Micro Facture LLC Milling, Turning, EDM, Grinding, Assembly · ISO 9001, ITAR | Lancaster, PA | MillingTurningEDMGrindingAssembly | ISO 9001, ITAR |
| Monarch Valve Corp Milling, Turning, Welding, Grinding, Assembly · ISO 9001 | Aston, PA | MillingTurningWeldingGrindingAssembly | ISO 9001 |
| Olympus Machining Milling, Turning · ITAR, CMMC | Hanover, PA | MillingTurning | ITAR, CMMC |
| Orbel Corp Stamping, Finishing | Easton, PA | StampingFinishing | - |
| Perseo-Erie Machine Sales Milling, Laser, EDM, Stamping | Erie, PA | MillingLaserEDMStamping | - |
| Plouse Machine Shop, Inc Milling, Turning, EDM, Grinding, Assembly · ISO 9001 | Highspire, PA | MillingTurningEDMGrindingAssembly | ISO 9001 |
| Precision Roll Grinders Inc Grinding, Finishing | Allentown, PA | GrindingFinishing | - |
| Reuss Industries, Inc Milling, Turning, Waterjet, Welding, EDM, Grinding | Madison, PA | MillingTurningWaterjetWeldingEDMGrinding | - |
| Reynolds Machine Co Milling, Turning · AS9100 | Ruffs Dale, PA | MillingTurning | AS9100 |
| Rinval Manufacturing Laser | Indiana, PA | Laser | - |
| Roaring Creek Machine Co Milling, Turning, Laser, Bending, Welding, Finishing · ITAR | Catawissa, PA | MillingTurningLaserBendingWeldingFinishing | ITAR |
| Sepco Erie Milling, Turning, Stamping · ISO 9001 | Erie, PA | MillingTurningStamping | ISO 9001 |
| Specialty Roller and Machine Inc Milling, Turning, Grinding | Berwick, PA | MillingTurningGrinding | - |
| Starn Tool & Manufacturing Company Milling, Turning, EDM, Grinding, Finishing · ISO 9001, ITAR | Meadville, PA | MillingTurningEDMGrindingFinishing | ISO 9001, ITAR |
| Steel Valley Fabricators, LLC Milling, Bending, Welding | Braddock, PA | MillingBendingWelding | - |
| Stellar Precision Components. Ltd Milling, Turning, EDM, Grinding · ISO 9001, AS9100 | Jeannette, PA | MillingTurningEDMGrinding | ISO 9001, AS9100 |
| Summit Machine Company Milling, Turning, Welding, Finishing · ISO 9001 | Alverton, PA | MillingTurningWeldingFinishing | ISO 9001 |
| Three Rivers Precision, LLC Welding, Assembly · ISO 9001 | East Liberty, PA | WeldingAssembly | ISO 9001 |
| US Anodize Finishing · NADCAP | Reading, PA | Finishing | NADCAP |
| US Axle, Inc Milling, Forging, Grinding | Pottstown, PA | MillingForgingGrinding | - |