| Metal Works Precision Machine and Tool, Inc Milling, Turning, Welding | Tucson, AZ | MillingTurningWelding | - |
| Metalbuilt LLC Milling, Turning, Laser, Welding, Stamping, Finishing · ISO 9001, AS9100, IATF 16949 | Chesterfield, MI | MillingTurningLaserWeldingStampingFinishing | ISO 9001, AS9100, IATF 16949 |
| Micro Facture LLC Milling, Turning, EDM, Grinding, Assembly · ISO 9001, ITAR | Lancaster, PA | MillingTurningEDMGrindingAssembly | ISO 9001, ITAR |
| Micro-Tec, Inc Milling, Turning, Welding, EDM, Finishing · ISO 9001, AS9100 | Chatsworth, CA | MillingTurningWeldingEDMFinishing | ISO 9001, AS9100 |
| Mid-Continent Machining Inc Milling, Turning, Welding, Finishing | Kansas City, KS | MillingTurningWeldingFinishing | - |
| Midlake Products & Mfg. Co., Inc Turning, Bending, Laser, Welding, Stamping | Canton, OH | TurningBendingLaserWeldingStamping | - |
| Midway Swiss Turn, Inc Milling, Turning, Swiss, Finishing, Assembly · CMMC | Wooster, OH | MillingTurningSwissFinishingAssembly | CMMC |
| Mikron Manufacturing Inc Milling, Turning, Laser, Punching, Bending, Welding, Finishing, Assembly · ISO 9001, ITAR | Colorado Springs, CO | MillingTurningLaserPunchingBendingWeldingFinishingAssembly | ISO 9001, ITAR |
| Millennium Precision LLC Milling, Turning, Swiss · ISO 9001, ITAR, NADCAP, ISO 13485 | Manchester, NH | MillingTurningSwiss | ISO 9001, ITAR, NADCAP, ISO 13485 |
| Miller Diversified Machining Milling, Turning, Welding · ISO 9001, ITAR | Minneapolis, MN | MillingTurningWelding | ISO 9001, ITAR |
| Millrite Machine Inc Turning, Assembly · ISO 9001 | Westfield, MA | TurningAssembly | ISO 9001 |
| Millworx Precision Machining Inc Milling, Turning · ISO 9001, AS9100 | Corona, CA | MillingTurning | ISO 9001, AS9100 |
| Milton Manufacturing, Inc Turning, Bending, Welding, Stamping, Assembly · ITAR | Detroit, MI | TurningBendingWeldingStampingAssembly | ITAR |
| MK Services Corp Milling, Turning, Swiss, Grinding, Assembly · ISO 9001, ITAR, ISO 13485 | Middleton, MA | MillingTurningSwissGrindingAssembly | ISO 9001, ITAR, ISO 13485 |
| Model Products Inc Milling, Turning, Swiss, Grinding · ISO 9001, AS9100 | Albuquerque, NM | MillingTurningSwissGrinding | ISO 9001, AS9100 |
| Moll Machine Works, LLC Milling, Turning, Welding | Williamson, NY | MillingTurningWelding | - |
| Mono Engineering Corp Turning, Welding, EDM · ISO 9001 | Chatsworth, CA | TurningWeldingEDM | ISO 9001 |
| Moseys Production Machinists, Inc Milling, Turning · ISO 9001, AS9100, ITAR, NADCAP | Anaheim, CA | MillingTurning | ISO 9001, AS9100, ITAR, NADCAP |
| Moultrie Tool & Manufacturing Co Inc Milling, Turning, Bending, Welding, EDM, Stamping · ISO 9001 | Memphis, TN | MillingTurningBendingWeldingEDMStamping | ISO 9001 |
| Mountain View Machine and Welding Milling, Turning, Waterjet, Welding, EDM | Logan, UT | MillingTurningWaterjetWeldingEDM | - |
| Mueller Machining LLC Milling, Turning, Laser, Bending, Grinding, Finishing | Salem, OR | MillingTurningLaserBendingGrindingFinishing | - |
| Multi Machining Capabilities, Inc. Milling, Turning, EDM | Romulus, MI | MillingTurningEDM | - |
| Naimor Inc Milling, Turning, Laser, Punching, Bending, Welding, Finishing, Assembly | Snohomish, WA | MillingTurningLaserPunchingBendingWeldingFinishingAssembly | - |
| Natoma Manufacturing, LLC Milling, Turning, Swiss, Finishing · ISO 9001, AS9100, NADCAP | Norton, KS | MillingTurningSwissFinishing | ISO 9001, AS9100, NADCAP |
| New Tech Metals Milling, Turning, Laser, Punching, Bending, Welding, Stamping, Finishing, Assembly · ISO 9001, AS9100, ITAR, IATF 16949, CMMC | Green Bay, WI | MillingTurningLaserPunchingBendingWeldingStampingFinishingAssembly | ISO 9001, AS9100, ITAR, IATF 16949, CMMC |
| Northeast Tool and Mfg. Co Milling, Turning, EDM · ISO 9001, AS9100, ITAR, CMMC | Matthews, NC | MillingTurningEDM | ISO 9001, AS9100, ITAR, CMMC |
| Northwest Machining & Manufacturing Inc Milling, Turning, Welding, EDM · ISO 9001 | Meridian, ID | MillingTurningWeldingEDM | ISO 9001 |
| NRL & Associates Inc Milling, Turning, Bending, Welding, Assembly | Stevensville, MD | MillingTurningBendingWeldingAssembly | - |
| Numerical Precision Inc Milling, Turning, Welding, EDM | Crosby, TX | MillingTurningWeldingEDM | - |
| Numericraft, Inc Milling, Turning, Finishing, Assembly | Tucson, AZ | MillingTurningFinishingAssembly | - |
| Oak Ridge Tool-Engineering Inc Milling, Turning, Welding, EDM, Grinding | Oak Ridge, TN | MillingTurningWeldingEDMGrinding | - |
| Odat Machine Milling, Turning, Welding, Grinding | Gorham, ME | MillingTurningWeldingGrinding | - |
| Olympic Tool Company Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Finishing, Assembly | Bayville, NJ | MillingTurningWaterjetBendingWeldingEDMGrindingFinishingAssembly | - |
| Olympus Machining Milling, Turning · ITAR, CMMC | Hanover, PA | MillingTurning | ITAR, CMMC |
| Omikron Engineering, Inc Milling, Turning, Swiss, Assembly · ISO 9001 | Chatsworth, CA | MillingTurningSwissAssembly | ISO 9001 |
| Onium Machine and Fabrication, LLC Milling, Turning, Laser, Bending, Welding, Assembly · ISO 9001 | Winder, GA | MillingTurningLaserBendingWeldingAssembly | ISO 9001 |
| Optima Precision Milling, Turning, Bending, Welding, EDM, Metal AM · ISO 9001, AS9100, ISO 13485, NADCAP | San Jose, CA | MillingTurningBendingWeldingEDMMetal AM | ISO 9001, AS9100, ISO 13485, NADCAP |
| Oregon Screw Machine Products Milling, Turning | Portland, OR | MillingTurning | - |
| Outback Manufacturing Milling, Turning, Swiss · AS9100, ITAR | Bend, OR | MillingTurningSwiss | AS9100, ITAR |
| Pacon Mfg, Inc Milling, Turning, Welding, Finishing · ISO 9001 | Livermore, CA | MillingTurningWeldingFinishing | ISO 9001 |
| Padgett Machine Tools Co Inc Milling, Turning, Stamping, Finishing · AS9100 | Gatesville, TX | MillingTurningStampingFinishing | AS9100 |
| Palma Acquisition Inc Milling, Turning, EDM, Grinding · ISO 9001, AS9100, ITAR | Lancaster, NY | MillingTurningEDMGrinding | ISO 9001, AS9100, ITAR |
| Parallax Manufacturing LLC Milling, Turning, Bending, Welding, Stamping, Assembly · NADCAP | Lake Elsinore, CA | MillingTurningBendingWeldingStampingAssembly | NADCAP |
| Paramount Machine Milling, Turning, EDM · ISO 9001, AS9100, ITAR | Salt Lake City, UT | MillingTurningEDM | ISO 9001, AS9100, ITAR |
| Partco, LLC Turning, Welding | Port Allen, LA | TurningWelding | - |
| Patterson Precision Manufacturing Inc Milling, Turning, Stamping, Grinding · ISO 9001, NADCAP | Norton Shores, MI | MillingTurningStampingGrinding | ISO 9001, NADCAP |
| PDS Milling, Turning, Swiss, Finishing, Assembly · ISO 9001 | Minneapolis, MN | MillingTurningSwissFinishingAssembly | ISO 9001 |
| Peerless Precision Inc Milling, Turning, Welding, Grinding · ISO 9001, AS9100, ITAR | Westfield, MA | MillingTurningWeldingGrinding | ISO 9001, AS9100, ITAR |
| Pegasus Mfg Inc Milling, Turning, Metal AM · ISO 9001, AS9100 | Galesburg, IL | MillingTurningMetal AM | ISO 9001, AS9100 |
| Pen Manufacturing Milling, Turning, Bending, Welding · ISO 9001, AS9100, ITAR, NADCAP | Anaheim, CA | MillingTurningBendingWelding | ISO 9001, AS9100, ITAR, NADCAP |