| SDS Engineering Milling, Turning, Grinding · ISO 9001 | Sun Valley, CA | MillingTurningGrinding | ISO 9001 |
| Serrano Industries, Inc Milling, Turning, Swiss, EDM, Grinding · ISO 9001, AS9100 | Santa Fe Springs, CA | MillingTurningSwissEDMGrinding | ISO 9001, AS9100 |
| Serrmi Products LLC Milling, Turning, Laser, Punching, Bending, Finishing | Pittsburg, KS | MillingTurningLaserPunchingBendingFinishing | - |
| Seven Star Marine Inc Milling, Turning, Waterjet, Bending, Welding, Finishing · ISO 9001 | Newport, RI | MillingTurningWaterjetBendingWeldingFinishing | ISO 9001 |
| Sharp Tooling Company Milling, Turning, Bending, Welding, Waterjet, EDM, Stamping, Metal AM | Buffalo, NY | MillingTurningBendingWeldingWaterjetEDMStampingMetal AM | - |
| Shaw Industries Co. LLC Milling, Turning, Welding, EDM · ISO 9001, ITAR | Franklin, PA | MillingTurningWeldingEDM | ISO 9001, ITAR |
| Sheetmetal Engineering Inc Milling, Laser, Punching, Bending, Welding · ISO 9001, AS9100 | Simi Valley, CA | MillingLaserPunchingBendingWelding | ISO 9001, AS9100 |
| Shoemaker Mfg Solutions Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Grinding · ISO 9001, AS9100, ITAR, CMMC | Souderton, PA | MillingTurningLaserWaterjetPunchingBendingWeldingStampingGrinding | ISO 9001, AS9100, ITAR, CMMC |
| Shrettech Tool & Machine LLC Milling, Turning, Welding, Grinding | Racine, WI | MillingTurningWeldingGrinding | - |
| Snyder Industries Inc Milling, Turning, Welding · ISO 9001 | Tonawanda, NY | MillingTurningWelding | ISO 9001 |
| Sonoma Industries Inc Milling, Turning, Swiss · ISO 9001, AS9100, ITAR | Bell Gardens, CA | MillingTurningSwiss | ISO 9001, AS9100, ITAR |
| Southeastern Machining Milling, Turning, Welding · ISO 9001 | Worthington, OH | MillingTurningWelding | ISO 9001 |
| SP Manufacturing Inc Milling, Turning, Welding, Finishing · ISO 9001, AS9100 | Livermore, CA | MillingTurningWeldingFinishing | ISO 9001, AS9100 |
| Stevens Engineering Inc Milling | Phoenix, AZ | Milling | - |
| Striking Precision Welding & Fabrication Milling, Bending, Welding · ISO 9001, ITAR | Cedar Park, TX | MillingBendingWelding | ISO 9001, ITAR |
| Superior Machining and Fabrication Inc Milling, Turning, Grinding, Assembly · ISO 9001, AS9100, ITAR | Muenster, TX | MillingTurningGrindingAssembly | ISO 9001, AS9100, ITAR |
| Superior Tooling Inc Milling, Turning, Swiss, Bending, Welding, Stamping, EDM, Grinding · ISO 9001 | Wapello, IA | MillingTurningSwissBendingWeldingStampingEDMGrinding | ISO 9001 |
| Sylhan LLC Milling, Turning, EDM · AS9100 | Edgewood, NY | MillingTurningEDM | AS9100 |
| T&K Machine Milling, Turning, Welding, EDM, Grinding | Livermore, CA | MillingTurningWeldingEDMGrinding | - |
| Taylor Manufacturing Co Inc Milling, Turning, Grinding | Springfield, OH | MillingTurningGrinding | - |
| TBT Machining Milling | Fremont, CA | Milling | - |
| The Flinchbaugh Company, Inc Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly | Manchester, PA | MillingTurningWeldingEDMGrindingFinishingAssembly | - |
| The Inventors Shop, L.L.C Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Assembly · ISO 9001, ITAR | Cinnaminson, NJ | MillingTurningLaserWaterjetPunchingBendingWeldingStampingAssembly | ISO 9001, ITAR |
| The Rembar Company LLC Milling, Turning, Welding, EDM, Grinding | Dobbs Ferry, NY | MillingTurningWeldingEDMGrinding | - |
| THR Machinery Milling, Turning, Bending, Welding | Allons, TN | MillingTurningBendingWelding | - |
| Tidewater Machine Co Milling, Turning, EDM | White Plains, MD | MillingTurningEDM | - |
| TM Industries Inc Milling, Welding | Santa Clara, CA | MillingWelding | - |
| TMF Inc Milling, Turning, Welding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP | Poulsbo, WA | MillingTurningWeldingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP |
| Toolcraft Precision Machining, LLC Milling, Turning · ISO 9001, ITAR, CMMC | Germantown, WI | MillingTurning | ISO 9001, ITAR, CMMC |
| Toolex Inc Milling, Turning | Houston, TX | MillingTurning | - |
| Topnotch Quality Works Milling, Turning · ISO 9001, ITAR | Pacoima, CA | MillingTurning | ISO 9001, ITAR |
| Torq Manufacturing Milling, Turning, Assembly | Ogden, UT | MillingTurningAssembly | - |
| TQ Systems Inc Milling, Turning, EDM, Assembly | Lake Forest, CA | MillingTurningEDMAssembly | - |
| TR Manufacturing, LLC Milling, Turning, Swiss, Laser, Waterjet, Welding, Finishing · CMMC | Garrett, IN | MillingTurningSwissLaserWaterjetWeldingFinishing | CMMC |
| Trinity Forge Inc Milling, Turning, Welding, Forging, Assembly · ISO 9001 | Mansfield, TX | MillingTurningWeldingForgingAssembly | ISO 9001 |
| Trufab LLC Milling, Turning, Welding | Shelton, WA | MillingTurningWelding | - |
| Turntec Manufacturing Milling, Turning, Welding, Grinding | Mills, WY | MillingTurningWeldingGrinding | - |
| Tyr Manufacturing LLC Milling, Turning · ISO 9001, ITAR, CMMC | Sedgwick, KS | MillingTurning | ISO 9001, ITAR, CMMC |
| US Aluminum Castings Milling, Turning, Casting, Grinding, Finishing, Assembly · ISO 9001, ITAR, NADCAP, IATF 16949 | Entiat, WA | MillingTurningCastingGrindingFinishingAssembly | ISO 9001, ITAR, NADCAP, IATF 16949 |
| Van - Wal Machine, Inc Milling, Turning, Grinding | Bellingham, MA | MillingTurningGrinding | - |
| Vanermen Smith Products Inc Milling, Turning, Waterjet, Bending, Welding, Grinding, Assembly · ISO 9001 | Lansing, MI | MillingTurningWaterjetBendingWeldingGrindingAssembly | ISO 9001 |
| Vantage Manufacturing & Assembly LLC Milling, Turning, Laser, Welding, Assembly | Poughkeepsie, NY | MillingTurningLaserWeldingAssembly | - |
| Vff-Metal Processing LLC Milling, Turning, EDM, Grinding, Finishing | Ellisville, MO | MillingTurningEDMGrindingFinishing | - |
| W Machine Works Inc Milling, Turning, Assembly · ISO 9001, AS9100, ITAR | San Fernando, CA | MillingTurningAssembly | ISO 9001, AS9100, ITAR |
| Walco Tool & Engineering Corp Milling, Turning, Welding, Grinding, Finishing · ISO 9001 | Romeoville, IL | MillingTurningWeldingGrindingFinishing | ISO 9001 |
| Werco Manufacturing Inc Milling, Turning, Laser, Bending, Welding, Finishing, Assembly · ISO 9001 | Broken Arrow, OK | MillingTurningLaserBendingWeldingFinishingAssembly | ISO 9001 |
| Werner Machine, Inc Milling, Turning | Marietta, GA | MillingTurning | - |
| Whi Global, LLC Milling, Turning, Forging, Assembly · ISO 9001, ITAR, NADCAP | Tulsa, OK | MillingTurningForgingAssembly | ISO 9001, ITAR, NADCAP |
| Wirecut Technologies, Inc Milling, Turning, EDM, Grinding | Indianapolis, IN | MillingTurningEDMGrinding | - |
| Yeamans Machine Shop, Inc Milling, Turning, Welding, Assembly · ISO 9001 | Los Alamos, NM | MillingTurningWeldingAssembly | ISO 9001 |