| Metaltek International Corp Milling, Welding, Casting, Metal AM · NADCAP | Waukesha, WI | MillingWeldingCastingMetal AM | NADCAP |
| Metalworking Group Bending, Welding · CMMC, ISO 9001, ITAR | Cincinnati, OH | BendingWelding | CMMC, ISO 9001, ITAR |
| Metron Machining LLC Milling, Metal AM · AS9100, ITAR, CMMC | Lakewood, CO | MillingMetal AM | AS9100, ITAR, CMMC |
| Metwerks LLC Turning, Waterjet, Welding | Rapid City, SD | TurningWaterjetWelding | - |
| Midlake Products & Mfg. Co., Inc Turning, Bending, Laser, Welding, Stamping | Canton, OH | TurningBendingLaserWeldingStamping | - |
| Midway Machine & Instrument Company Inc Milling, Turning, EDM, Finishing · ISO 9001 | South Houston, TX | MillingTurningEDMFinishing | ISO 9001 |
| Milco Wire EDM Inc Waterjet, Stamping, EDM · AS9100, ITAR, NADCAP | Huntington Beach, CA | WaterjetStampingEDM | AS9100, ITAR, NADCAP |
| Miller Diversified Machining Milling, Turning, Welding · ISO 9001, ITAR | Minneapolis, MN | MillingTurningWelding | ISO 9001, ITAR |
| Millipart, Inc Milling, Turning · ISO 9001, AS9100 | Glendora, CA | MillingTurning | ISO 9001, AS9100 |
| Miltech Milling, Turning · AS9100 | Norton, KS | MillingTurning | AS9100 |
| Minter Industries LLC Milling · ISO 9001 | Lakewood, WA | Milling | ISO 9001 |
| MK Services Corp Milling, Turning, Swiss, Grinding, Assembly · ISO 9001, ITAR, ISO 13485 | Middleton, MA | MillingTurningSwissGrindingAssembly | ISO 9001, ITAR, ISO 13485 |
| MMG Corp Milling, Turning, Finishing, Assembly · ISO 9001 | Ontario, CA | MillingTurningFinishingAssembly | ISO 9001 |
| Models & Tools Inc Milling, Turning, Welding · AS9100 | Shelby Township, MI | MillingTurningWelding | AS9100 |
| Mono Engineering Corp Turning, Welding, EDM · ISO 9001 | Chatsworth, CA | TurningWeldingEDM | ISO 9001 |
| Montgomery Dynamics Milling, Turning, Welding · ISO 9001, ITAR | Huntingdon Valley, PA | MillingTurningWelding | ISO 9001, ITAR |
| Morrison Industries LLC Milling, Turning, Laser, Bending, Welding, Finishing, Assembly | Morrison, TN | MillingTurningLaserBendingWeldingFinishingAssembly | - |
| Motive Machine Works LLC Milling, Turning, Stamping, Finishing, Assembly | Lancaster, PA | MillingTurningStampingFinishingAssembly | - |
| MP Components Casting · ISO 9001 | Byron Center, MI | Casting | ISO 9001 |
| Multisource Manufacturing LLC Milling, Turning, Swiss, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR, ISO 13485 | Minneapolis, MN | MillingTurningSwissEDMGrindingFinishing | ISO 9001, AS9100, ITAR, ISO 13485 |
| Natoma Manufacturing, LLC Milling, Turning, Swiss, Finishing · ISO 9001, AS9100, NADCAP | Norton, KS | MillingTurningSwissFinishing | ISO 9001, AS9100, NADCAP |
| Nebraska Machine Products, Inc Turning, Welding, Grinding, Finishing | Omaha, NE | TurningWeldingGrindingFinishing | - |
| Neosource, Inc. Milling, Welding, Waterjet · ISO 9001, AS9100 | Tulsa, OK | MillingWeldingWaterjet | ISO 9001, AS9100 |
| Neway Stamping & Manufacturing, Inc Laser, Stamping, Finishing | Willoughby, OH | LaserStampingFinishing | - |
| Next Intent, Inc Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001, ITAR | San Luis Obispo, CA | MillingTurningWeldingEDMGrindingAssembly | ISO 9001, ITAR |
| Niagara Manufacturing Co Milling, Turning, Bending, Welding | Erie, PA | MillingTurningBendingWelding | - |
| NMB Manufacturing LLC Milling, Turning, Bending, Welding | Bixby, OK | MillingTurningBendingWelding | - |
| Norotos, Inc Turning, Forging | Santa Ana, CA | TurningForging | - |
| North East Precision CNC Milling, Turning · ISO 9001, ITAR | Dover, NH | MillingTurning | ISO 9001, ITAR |
| North Machine & Fabrication LLC Milling, Bending, Welding, Finishing | Chugiak, AK | MillingBendingWeldingFinishing | - |
| North Second Street Steel Laser, Welding | Minneapolis, MN | LaserWelding | - |
| Northeast Tool and Mfg. Co Milling, Turning, EDM · ISO 9001, AS9100, ITAR, CMMC | Matthews, NC | MillingTurningEDM | ISO 9001, AS9100, ITAR, CMMC |
| Novalite USA LLC Swiss, EDM, Grinding, Assembly · AS9100 | Sandpoint, ID | SwissEDMGrindingAssembly | AS9100 |
| NTO Designs Milling, Turning, Laser, Welding, Finishing | Ormond Beach, FL | MillingTurningLaserWeldingFinishing | - |
| Nu-Tech Machining Inc Milling, Turning · ITAR | Vancouver, WA | MillingTurning | ITAR |
| Odat Machine Milling, Turning, Welding, Grinding | Gorham, ME | MillingTurningWeldingGrinding | - |
| Odyssey Machining Milling, Finishing · ISO 9001, ITAR | San Jose, CA | MillingFinishing | ISO 9001, ITAR |
| Omanson Precision Engineering, Inc Milling, Finishing · ISO 9001, AS9100 | Chino, CA | MillingFinishing | ISO 9001, AS9100 |
| Operateup Inc Milling, Turning, Punching, Welding, Stamping · ISO 9001 | Orange, MA | MillingTurningPunchingWeldingStamping | ISO 9001 |
| Ottenweller Company, Inc. Bending, Laser, Welding · ISO 9001 | Fort Wayne, IN | BendingLaserWelding | ISO 9001 |
| Pace Machine & Tool, Inc Milling, Turning, Grinding · ISO 9001, AS9100, ITAR | Stuart, FL | MillingTurningGrinding | ISO 9001, AS9100, ITAR |
| Package One Industries, LLC Milling, Swiss, Waterjet, Bending, Welding, Stamping, Casting, Finishing, Assembly · ISO 9001, ITAR, NADCAP | Schenectady, NY | MillingSwissWaterjetBendingWeldingStampingCastingFinishingAssembly | ISO 9001, ITAR, NADCAP |
| Padgett Machine Tools Co Inc Milling, Turning, Stamping, Finishing · AS9100 | Gatesville, TX | MillingTurningStampingFinishing | AS9100 |
| Painter Tool Incorporated Milling, Turning, Welding, EDM | Irwin, PA | MillingTurningWeldingEDM | - |
| Paligen Technologies Welding, Forging | Garland, TX | WeldingForging | - |
| Parallax Manufacturing LLC Milling, Turning, Bending, Welding, Stamping, Assembly · NADCAP | Lake Elsinore, CA | MillingTurningBendingWeldingStampingAssembly | NADCAP |
| Parallel Works LLC Milling | Central, SC | Milling | - |
| Paramount Machine Turning, EDM · ISO 9001, AS9100, NADCAP | Manchester, CT | TurningEDM | ISO 9001, AS9100, NADCAP |
| Paramount Machine Milling, Turning, EDM · ISO 9001, AS9100, ITAR | Salt Lake City, UT | MillingTurningEDM | ISO 9001, AS9100, ITAR |
| Parts Tool & Die, LLC Milling, Turning, Assembly · ISO 9001, AS9100, ITAR | Agawam, MA | MillingTurningAssembly | ISO 9001, AS9100, ITAR |