| Withers Manufacturing, Inc Milling, Turning, Welding, Finishing | Tulsa, OK | MillingTurningWeldingFinishing | - |
| Wolverine Machine Products Company Milling, Turning, Waterjet, Welding, Grinding, Finishing · ISO 9001 | Holly, MI | MillingTurningWaterjetWeldingGrindingFinishing | ISO 9001 |
| Worldwide Instrument Parts Co Milling, Turning, EDM, Finishing · ISO 9001 | Livingston, TX | MillingTurningEDMFinishing | ISO 9001 |
| Wpa Works LLC Milling, Turning, Swiss, EDM, Finishing · ISO 9001 | Elgin, IL | MillingTurningSwissEDMFinishing | ISO 9001 |
| X-Mil, Inc Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Finishing · ISO 9001 | Mount Orab, OH | MillingTurningWaterjetBendingWeldingEDMGrindingFinishing | ISO 9001 |
| Xyz Aerospace LLC Milling, Waterjet, Welding, Finishing · AS9100, ITAR | Melbourne, FL | MillingWaterjetWeldingFinishing | AS9100, ITAR |
| Yakima Machine Milling, Turning, Finishing | Yakima, WA | MillingTurningFinishing | - |
| Yankee Steel Inc Turning, Welding, Finishing | Terre Haute, IN | TurningWeldingFinishing | - |
| Yeager Manufacturing Technologies LLC Milling, Turning, Laser, Bending, Welding, Finishing | Winter Park, FL | MillingTurningLaserBendingWeldingFinishing | - |
| Yuhas Tooling & Machining Inc Milling, Turning, Grinding, Finishing | Milpitas, CA | MillingTurningGrindingFinishing | - |
| Zike Industries LLC Milling, Turning, Laser, Welding, Finishing | Tolland, CT | MillingTurningLaserWeldingFinishing | - |
| Zimmer Design & Manufacturing LLC Milling, Turning, Laser, Welding, EDM, Finishing · AS9100, ITAR | Leander, TX | MillingTurningLaserWeldingEDMFinishing | AS9100, ITAR |
| Zip Products Inc Milling, Turning, Swiss, Stamping, EDM, Grinding, Finishing, Assembly · ITAR | Rochester, NY | MillingTurningSwissStampingEDMGrindingFinishingAssembly | ITAR |