| Nicholson Metal Fabricators Bending, Welding | Dallas, TX | BendingWelding | - |
| Niekamp Tool Co Inc Stamping | Kingston, NY | Stamping | - |
| Nikel Precision Group LLC Milling, Turning, Grinding, Assembly · ISO 13485 | Saco, ME | MillingTurningGrindingAssembly | ISO 13485 |
| Nix Manufacturing, Inc Milling, Turning, Swiss · AS9100, ITAR | Sutherlin, OR | MillingTurningSwiss | AS9100, ITAR |
| NJ Precision Technologies Inc Milling, Welding, Stamping, EDM, Finishing · ISO 9001, AS9100, ITAR, ISO 13485 | Mountainside, NJ | MillingWeldingStampingEDMFinishing | ISO 9001, AS9100, ITAR, ISO 13485 |
| NMB Manufacturing LLC Milling, Turning, Bending, Welding | Bixby, OK | MillingTurningBendingWelding | - |
| Nocturnal Welding Welding | Camarillo, CA | Welding | - |
| Nolan's Machine Shop, Inc Milling, Turning, Welding, EDM, Grinding | Lafayette, LA | MillingTurningWeldingEDMGrinding | - |
| Nolte Precise Manufacturing Inc Milling, Turning, Swiss · ISO 9001, AS9100 | Cincinnati, OH | MillingTurningSwiss | ISO 9001, AS9100 |
| Nominal Machining LLC Milling, Turning, Welding · ISO 9001, AS9100, ITAR | Elk Grove, CA | MillingTurningWelding | ISO 9001, AS9100, ITAR |
| Non-Ferrous Casting Company Casting | Dayton, OH | Casting | - |
| Noron Precision Machining Inc Milling, Turning, Grinding, Finishing, Assembly · ISO 9001, ITAR | Sunnyvale, CA | MillingTurningGrindingFinishingAssembly | ISO 9001, ITAR |
| Norotos, Inc Turning, Forging | Santa Ana, CA | TurningForging | - |
| North Carolina Manufacturing Inc Milling, Turning, EDM, Grinding · ISO 9001, AS9100 | Goldsboro, NC | MillingTurningEDMGrinding | ISO 9001, AS9100 |
| North Country Engineering Inc Milling, Turning, Laser, Grinding · ISO 9001, AS9100, ITAR | Derby, VT | MillingTurningLaserGrinding | ISO 9001, AS9100, ITAR |
| 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 Manufacturing Milling, Turning, Assembly · ISO 9001 | Stoneham, MA | MillingTurningAssembly | ISO 9001 |
| Northeast Tool and Mfg. Co Milling, Turning, EDM · ISO 9001, AS9100, ITAR, CMMC | Matthews, NC | MillingTurningEDM | ISO 9001, AS9100, ITAR, CMMC |
| Northern Gear, LLC Casting, Finishing | Muskego, WI | CastingFinishing | - |
| Northern Lucus Machine Shop Turning, Punching, Welding | Lubbock, TX | TurningPunchingWelding | - |
| Northern Machining & Repair, Inc Milling, Turning, Welding | Escanaba, MI | MillingTurningWelding | - |
| Northern States Metals Bending, Welding, Stamping · ISO 9001 | Youngstown, OH | BendingWeldingStamping | ISO 9001 |
| Northfield Manufacturing, Inc Welding, Casting | Westland, MI | WeldingCasting | - |
| Northlake Steel Corp Turning, Forging, Grinding, Finishing | Valley City, OH | TurningForgingGrindingFinishing | - |
| Northway Mathers Inc Milling, Turning, Waterjet, Bending, Welding, Finishing | Mukilteo, WA | MillingTurningWaterjetBendingWeldingFinishing | - |
| Northwest Machining & Manufacturing Inc Milling, Turning, Welding, EDM · ISO 9001 | Meridian, ID | MillingTurningWeldingEDM | ISO 9001 |
| Northwest Steel Fab, Inc Milling, Punching, Bending, Welding | Deer Park, WA | MillingPunchingBendingWelding | - |
| Nose Corporation of America Milling, Turning, Waterjet, Welding · AS9100 | Virginia Beach, VA | MillingTurningWaterjetWelding | AS9100 |
| Nova Precision Products Inc Turning | Rockaway, NJ | Turning | - |
| Novalite USA LLC Swiss, EDM, Grinding, Assembly · AS9100 | Sandpoint, ID | SwissEDMGrindingAssembly | AS9100 |
| Novo Modo Machining Milling · ISO 9001, AS9100, ITAR, CMMC | Mount Vernon, WA | Milling | ISO 9001, AS9100, ITAR, CMMC |
| NRL & Associates Inc Milling, Turning, Bending, Welding, Assembly | Stevensville, MD | MillingTurningBendingWeldingAssembly | - |
| NS Precision, Inc Milling, Finishing, Assembly · ITAR | Cornelius, NC | MillingFinishingAssembly | ITAR |
| NTO Designs Milling, Turning, Laser, Welding, Finishing | Ormond Beach, FL | MillingTurningLaserWeldingFinishing | - |
| Nu-Tech Machining Inc Milling, Turning · ITAR | Vancouver, WA | MillingTurning | ITAR |
| Nuclear Lead Co, Inc Welding, Casting | Oak Ridge, TN | WeldingCasting | - |
| Numberall Stamp & Tool Co., Inc Stamping | Sangerville, ME | Stamping | - |
| Numerical Precision Inc Milling, Turning, Welding, EDM | Crosby, TX | MillingTurningWeldingEDM | - |
| Numericraft, Inc Milling, Turning, Finishing, Assembly | Tucson, AZ | MillingTurningFinishingAssembly | - |
| Nusource, LLC Welding, Assembly | Alexandria, VA | WeldingAssembly | - |
| NW4S Inc Milling, Punching, Bending, Welding, Stamping, EDM, Finishing · ISO 9001, AS9100 | Lewiston, ID | MillingPunchingBendingWeldingStampingEDMFinishing | ISO 9001, AS9100 |
| Alziebler Incorporated Milling, Turning, Welding, Grinding, Finishing · ISO 9001, AS9100, ITAR, NADCAP | Arleta, CA | MillingTurningWeldingGrindingFinishing | ISO 9001, AS9100, ITAR, NADCAP |
| Aotco Holdings, LLC Finishing · ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 | Billerica, MA | Finishing | ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 |
| APV Manufacturing Milling, Waterjet, Bending, Welding, Grinding · NADCAP | Buena Park, CA | MillingWaterjetBendingWeldingGrinding | NADCAP |
| Armoloy of Connecticut, Inc Finishing · ISO 9001, AS9100, ITAR, NADCAP | Bristol, CT | Finishing | ISO 9001, AS9100, ITAR, NADCAP |
| Astro Manufacturing & Design Inc Milling, Turning, Laser, Waterjet, Welding, EDM, Finishing, Assembly · ISO 9001, NADCAP | Eastlake, OH | MillingTurningLaserWaterjetWeldingEDMFinishingAssembly | ISO 9001, NADCAP |
| Busch Brothers Milling, Turning, Swiss, Finishing | New Prague, MN | MillingTurningSwissFinishing | - |
| California Amforge Corp Welding, Forging · ISO 9001, AS9100, ITAR, NADCAP | Azusa, CA | WeldingForging | ISO 9001, AS9100, ITAR, NADCAP |