| Spokane Tin & Sheet Iron Works, Inc. Bending, Welding | Spokane, WA | BendingWelding | - |
| Still Waters Metal Fab LLC Bending, Welding | Spokane Valley, WA | BendingWelding | - |
| Stork Precision Machining LLC Milling, Turning, Welding, EDM, Grinding · ISO 9001, CMMC | Washington, MO | MillingTurningWeldingEDMGrinding | ISO 9001, CMMC |
| Streich Bros Inc Milling, Welding | Tacoma, WA | MillingWelding | - |
| Swiss Productions, Inc Milling, Turning, Assembly · ISO 9001 | Liberty Lake, WA | MillingTurningAssembly | ISO 9001 |
| Takfab Precision Gunsmithing LLC Milling, Welding | Oak Harbor, WA | MillingWelding | - |
| Tech Heavy Industries, Inc Milling, Waterjet, Bending, Welding | Riverside, WA | MillingWaterjetBendingWelding | - |
| Techcraft Precision Milling, Finishing · AS9100, ITAR, CMMC | Bellingham, WA | MillingFinishing | AS9100, ITAR, CMMC |
| Three Sigma Manufacturing, Inc Milling, Turning, Welding, EDM, Grinding | Kent, WA | MillingTurningWeldingEDMGrinding | - |
| TMF Inc Milling, Turning, Welding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP | Poulsbo, WA | MillingTurningWeldingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP |
| TNT Machining LLC Milling, Turning, Grinding, Finishing | Sumas, WA | MillingTurningGrindingFinishing | - |
| Toolcraft Inc Milling, Turning · ISO 9001, ITAR | Monroe, WA | MillingTurning | ISO 9001, ITAR |
| Trufab LLC Milling, Turning, Welding | Shelton, WA | MillingTurningWelding | - |
| Turnings Plus, LLC Turning | Washington, MO | Turning | - |
| USWP Manufacturing Bending, Stamping, Finishing · AS9100, NADCAP | Spokane Valley, WA | BendingStampingFinishing | AS9100, NADCAP |
| Western Fabrication Center LLC Turning, Bending, Welding, Grinding · ISO 9001 | Kelso, WA | TurningBendingWeldingGrinding | ISO 9001 |
| Wheeler Industries Inc Milling, Turning, Bending, Welding | Spokane Valley, WA | MillingTurningBendingWelding | - |
| Xtreme Machining, Inc Milling, Turning · ISO 9001, AS9100 | Auburn, WA | MillingTurning | ISO 9001, AS9100 |
| Yakima Machine Milling, Turning, Finishing | Yakima, WA | MillingTurningFinishing | - |
| Zigler's Welding Shop, Inc Welding | Tumwater, WA | Welding | - |
| Allied Industrial Machine Services Inc Milling, Turning, Welding, Grinding, Finishing | Falls Church, VA | MillingTurningWeldingGrindingFinishing | - |
| Blue Collar Metalworks Welding | Newport News, VA | Welding | - |
| Vulcan Engineering & Manf Milling, Turning, Laser, Punching, Bending, Welding, Grinding, Finishing | Waldorf, MD | MillingTurningLaserPunchingBendingWeldingGrindingFinishing | - |
| Winkler's Inc Welding | Baltimore, MD | Welding | - |