| Braswell Precision Inc Milling, Turning, EDM, Finishing, Assembly · ISO 9001, NADCAP | Glen Burnie, MD | MillingTurningEDMFinishingAssembly | ISO 9001, NADCAP |
| Central Precision Inc Milling, Laser, Punching, Bending, Welding, Grinding, Finishing · ISO 9001 | Boonsboro, MD | MillingLaserPunchingBendingWeldingGrindingFinishing | ISO 9001 |
| Deperini Metal Fabricators Milling, Laser, Punching, Bending, Welding, Grinding, Finishing · ISO 9001 | Gaithersburg, MD | MillingLaserPunchingBendingWeldingGrindingFinishing | ISO 9001 |
| FJB Engineering Company Milling, Turning, Welding, Finishing · ISO 9001 | Frederick, MD | MillingTurningWeldingFinishing | ISO 9001 |
| RCI Custom Milling, Laser, Bending, Welding, Finishing · ISO 9001 | Frederick, MD | MillingLaserBendingWeldingFinishing | ISO 9001 |
| Atlas Machine Co. Inc Milling, Turning, Welding · ISO 9001, AS9100 | Baltimore, MD | MillingTurningWelding | ISO 9001, AS9100 |
| Lenson Machine Inc Milling, Turning, Stamping, EDM · ISO 9001 | Middle River, MD | MillingTurningStampingEDM | ISO 9001 |
| Pro-Fabricators, LLC Milling, Laser, Bending, Welding · ISO 9001 | Smithsburg, MD | MillingLaserBendingWelding | ISO 9001 |
| Ross Machine Company Inc Milling, Welding · ISO 9001, ITAR | Belcamp, MD | MillingWelding | ISO 9001, ITAR |
| B & B Manufacturing Co, Inc Laser, Bending, Welding, Finishing | Forest Hill, MD | LaserBendingWeldingFinishing | - |
| Churchmen's Machine Company Milling, Turning, Laser, Waterjet, Welding, Grinding, Finishing | North East, MD | MillingTurningLaserWaterjetWeldingGrindingFinishing | - |
| Clark Machine Corporation Welding, Finishing | Baltimore, MD | WeldingFinishing | - |
| Combs Enterprises Incorporated Milling, Turning, Bending, Welding, Finishing · ITAR | Great Mills, MD | MillingTurningBendingWeldingFinishing | ITAR |
| Lai International Inc Milling, Laser, Waterjet, Welding, Metal AM, EDM, Finishing · NADCAP | Westminster, MD | MillingLaserWaterjetWeldingMetal AMEDMFinishing | NADCAP |
| Maryland Greater Tool & Manufacturing Milling, Turning, Waterjet, Welding, Grinding, Finishing | Mountain Lake Park, MD | MillingTurningWaterjetWeldingGrindingFinishing | - |
| Netzer Metalworks, LLC Milling, Punching, Bending, Welding, Finishing, Assembly · NADCAP | Essex, MD | MillingPunchingBendingWeldingFinishingAssembly | NADCAP |
| New London Precision Instruments Inc Milling, Waterjet, EDM, Grinding, Finishing | New Market, MD | MillingWaterjetEDMGrindingFinishing | - |
| RHS Precision LLC Milling, Turning, Finishing · ITAR | Edgewood, MD | MillingTurningFinishing | ITAR |
| B & B Precision Wire EDM Inc Milling, EDM, Grinding · ITAR | Forest Hill, MD | MillingEDMGrinding | ITAR |
| Chesapeake Machine Co Milling, Welding | Baltimore, MD | MillingWelding | - |
| Custom Machine Milling, Turning, Welding, Grinding | Hagerstown, MD | MillingTurningWeldingGrinding | - |
| Excel Machine & Fabrication Inc Milling, Turning, Swiss, Welding | Baltimore, MD | MillingTurningSwissWelding | - |
| Fabpro Technologies Milling, Welding | Halethorpe, MD | MillingWelding | - |
| Lake Precision Machine Inc Turning, Welding | Hagerstown, MD | TurningWelding | - |
| Loper Machine LLC Milling, Turning | Edgewood, MD | MillingTurning | - |
| Mac Machine Company Milling, Turning, Welding, EDM, Grinding · AS9100, ITAR, NADCAP, CMMC | Baltimore, MD | MillingTurningWeldingEDMGrinding | AS9100, ITAR, NADCAP, CMMC |
| National Jet Company, Inc Milling, Turning, Swiss, Welding, EDM | Lavale, MD | MillingTurningSwissWeldingEDM | - |
| NRL & Associates Inc Milling, Turning, Bending, Welding, Assembly | Stevensville, MD | MillingTurningBendingWeldingAssembly | - |
| Paradorn, LLC Milling, Turning · ITAR | White Plains, MD | MillingTurning | ITAR |
| Ray Machine Inc Milling, Turning, Laser, Bending, Welding, Finishing · ISO 9001, AS9100 | Middle River, MD | MillingTurningLaserBendingWeldingFinishing | ISO 9001, AS9100 |
| Tec Inc Milling, Turning, Swiss, Laser, Punching, Bending, Welding, Finishing, Assembly · ISO 9001 | Frederick, MD | MillingTurningSwissLaserPunchingBendingWeldingFinishingAssembly | ISO 9001 |
| Tidewater Machine Co Milling, Turning, EDM | White Plains, MD | MillingTurningEDM | - |
| JTJ Engineering Inc Milling, Turning · ISO 9001, ITAR | Severna Park, MD | MillingTurning | ISO 9001, ITAR |
| Tricnc LLC Milling · ISO 9001 | Gaithersburg, MD | Milling | ISO 9001 |
| American Bully Manufacturing LLC Milling, Bending, Welding, Finishing, Assembly · AS9100 | Annapolis Junction, MD | MillingBendingWeldingFinishingAssembly | AS9100 |
| Vulcan Engineering & Manf Milling, Turning, Laser, Punching, Bending, Welding, Grinding, Finishing | Waldorf, MD | MillingTurningLaserPunchingBendingWeldingGrindingFinishing | - |
| American Efficiency Services Welding | Cumberland, MD | Welding | - |
| CTC Machining, LLC Milling, Turning | Hampstead, MD | MillingTurning | - |
| Diversified Machining Inc Milling, Welding | Forest Hill, MD | MillingWelding | - |
| Incremental Machine Milling, Bending | Baltimore, MD | MillingBending | - |
| Land Sea Air Manufacturing Inc Milling, Turning, Waterjet, Assembly | Westminster, MD | MillingTurningWaterjetAssembly | - |
| Stephen J Hartman Milling, Turning, Welding, Grinding | Sykesville, MD | MillingTurningWeldingGrinding | - |
| Western Industrial Machining Inc Milling, Laser, Welding, Assembly | Hampstead, MD | MillingLaserWeldingAssembly | - |
| Winkler's Inc Welding | Baltimore, MD | Welding | - |