| Stanfordville Machine & Manufacturing Co Inc Milling, Turning, Swiss, Welding, EDM, Grinding · ISO 9001, AS9100 | Poughkeepsie, NY | MillingTurningSwissWeldingEDMGrinding | ISO 9001, AS9100 |
| Stanton Precision Products L.L.C Milling, Turning, Swiss, Grinding · CMMC | Butler, NJ | MillingTurningSwissGrinding | CMMC |
| Stark Industrial, LLC Milling, Turning, Swiss, Welding, EDM, Grinding · ISO 9001 | North Canton, OH | MillingTurningSwissWeldingEDMGrinding | ISO 9001 |
| Starlite Diversified Inc Milling, Turning, Welding, EDM, Grinding | Meadville, PA | MillingTurningWeldingEDMGrinding | - |
| Steelcrest Precision, Inc Milling, Turning, Swiss, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100 | Wauseon, OH | MillingTurningSwissWeldingEDMGrindingAssembly | ISO 9001, AS9100 |
| Steer Machine Tool and Die Corporation Milling, Turning, Welding, Grinding | Honesdale, PA | MillingTurningWeldingGrinding | - |
| Stephens Precision, Inc Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100, ITAR | Bradford, VT | MillingTurningWeldingEDMGrindingAssembly | ISO 9001, AS9100, ITAR |
| Stone Machine Co. Inc Milling, Turning, Grinding, Finishing | Chester, NH | MillingTurningGrindingFinishing | - |
| Stork Precision Machining LLC Milling, Turning, Welding, EDM, Grinding · ISO 9001, CMMC | Washington, MO | MillingTurningWeldingEDMGrinding | ISO 9001, CMMC |
| Sturdy Grinding & Machining Inc Grinding, Finishing · ISO 9001 | New Haven, MI | GrindingFinishing | ISO 9001 |
| Sulzer Machine & Manufacturing Inc Milling, Welding, Grinding · ISO 9001 | Mosinee, WI | MillingWeldingGrinding | ISO 9001 |
| Summit Machine Solutions LLC Milling, Welding, Grinding | Akron, OH | MillingWeldingGrinding | - |
| Superior Grinding Corp Milling, Turning, Grinding, Finishing | Antigo, WI | MillingTurningGrindingFinishing | - |
| Superior Metal Products Inc Milling, Turning, Grinding · ISO 9001 | Louviers, CO | MillingTurningGrinding | ISO 9001 |
| Superior Tooling Inc Milling, Turning, Swiss, Bending, Welding, Stamping, EDM, Grinding · ISO 9001 | Wapello, IA | MillingTurningSwissBendingWeldingStampingEDMGrinding | ISO 9001 |
| Supreme Gear Co Milling, Turning, Grinding · ISO 9001, NADCAP | Fraser, MI | MillingTurningGrinding | ISO 9001, NADCAP |
| Surface Finishes Welding, Grinding · ITAR | Addison, IL | WeldingGrinding | ITAR |
| Swiss Screw Products Inc Milling, Turning, Swiss, Grinding, Assembly · ISO 9001 | Santa Clara, CA | MillingTurningSwissGrindingAssembly | ISO 9001 |
| Swiss-Tech LLC Milling, Turning, Swiss, Grinding, Finishing | Delavan, WI | MillingTurningSwissGrindingFinishing | - |
| T-Tygart Industries, Inc Milling, Turning, Bending, Welding, Grinding | Carmichaels, PA | MillingTurningBendingWeldingGrinding | - |
| Taylor Turning Inc Milling, Turning, Grinding | Wixom, MI | MillingTurningGrinding | - |
| Tessec LLC Milling, Welding, EDM, Grinding, Assembly · AS9100 | Dayton, OH | MillingWeldingEDMGrindingAssembly | AS9100 |
| The Jet Pulverizer Co Milling, Grinding · ISO 9001 | Moorestown, NJ | MillingGrinding | ISO 9001 |
| Thompson & Smith Industries LLC Milling, Turning, Welding, EDM, Grinding | Tullahoma, TN | MillingTurningWeldingEDMGrinding | - |
| Tico Tooling LLC Milling, Turning, Stamping, EDM, Grinding · ISO 9001 | San Marcos, TX | MillingTurningStampingEDMGrinding | ISO 9001 |
| TMD Machining Inc Milling, Turning, Swiss, EDM, Grinding · AS9100, NADCAP | Plainwell, MI | MillingTurningSwissEDMGrinding | AS9100, NADCAP |
| TMS Inc Milling, Laser, Punching, Bending, Welding, Grinding, Finishing, Assembly | New Berlin, WI | MillingLaserPunchingBendingWeldingGrindingFinishingAssembly | - |
| Tomak Precision Milling, Turning, Swiss, Welding, EDM, Grinding | Lebanon, OH | MillingTurningSwissWeldingEDMGrinding | - |
| Toner Machining Technologies Inc Milling, Turning, Waterjet, Punching, Bending, Welding, EDM, Grinding | Morganton, NC | MillingTurningWaterjetPunchingBendingWeldingEDMGrinding | - |
| Toolco Inc Milling, Turning, Welding, Stamping, EDM, Grinding | Owensboro, KY | MillingTurningWeldingStampingEDMGrinding | - |
| Toolrite Mfg Co., Inc Turning, Grinding | New Berlin, WI | TurningGrinding | - |
| Total Manufacturing Milling, Turning, Waterjet, Welding, EDM, Grinding | Mentor, OH | MillingTurningWaterjetWeldingEDMGrinding | - |
| Tram-Tek, Inc Milling, Turning, EDM, Grinding · ISO 9001, AS9100 | Phoenix, AZ | MillingTurningEDMGrinding | ISO 9001, AS9100 |
| Transfer USA Milling, Turning, Grinding | Knoxville, TN | MillingTurningGrinding | - |
| Tri Fab Associates, Inc Milling, Turning, Laser, Punching, Welding, Stamping, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, CMMC | Fremont, CA | MillingTurningLaserPunchingWeldingStampingGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, CMMC |
| Tri-State Tool Grinding Incorporated Milling, Grinding · ISO 9001 | Cincinnati, OH | MillingGrinding | ISO 9001 |
| Triad Tool & Die Co Milling, Turning, Waterjet, Welding, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, NADCAP | Somerville, NJ | MillingTurningWaterjetWeldingEDMGrindingFinishingAssembly | ISO 9001, AS9100, NADCAP |
| Triplex Industries Inc Turning, Welding, Stamping, EDM, Grinding, Assembly · ITAR | Rochester, NY | TurningWeldingStampingEDMGrindingAssembly | ITAR |
| Turntec Manufacturing Milling, Turning, Welding, Grinding | Mills, WY | MillingTurningWeldingGrinding | - |
| Two M Precision Co. Inc Milling, Grinding, Finishing · ISO 9001 | Willoughby, OH | MillingGrindingFinishing | ISO 9001 |
| Ultra-Tech Aerospace, Inc Milling, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100, NADCAP | Kansas City, KS | MillingWeldingEDMGrindingAssembly | ISO 9001, AS9100, NADCAP |
| United CNC Machining Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR, NADCAP, CMMC | Auburn Hills, MI | MillingTurningLaserWaterjetWeldingEDMGrindingFinishing | ISO 9001, AS9100, ITAR, NADCAP, CMMC |
| Universal Compressor Solutions, LLC Welding, Grinding | Mayfield, KY | WeldingGrinding | - |
| Universal Machine & Design Corporation Milling, Grinding | Fitchburg, MA | MillingGrinding | - |
| US Aluminum Castings Milling, Turning, Casting, Grinding, Finishing, Assembly · ISO 9001, ITAR, NADCAP, IATF 16949 | Entiat, WA | MillingTurningCastingGrindingFinishingAssembly | ISO 9001, ITAR, NADCAP, IATF 16949 |
| US Axle, Inc Milling, Forging, Grinding | Pottstown, PA | MillingForgingGrinding | - |
| V.e.p. Manufacturing Inc Milling, Turning, Welding, Grinding · ISO 9001 | Jackson, NJ | MillingTurningWeldingGrinding | ISO 9001 |
| V&S Engineering Milling, Turning, EDM, Grinding · ISO 9001, AS9100, ITAR | Huntington Beach, CA | MillingTurningEDMGrinding | ISO 9001, AS9100, ITAR |
| Valley Machining Co Milling, Turning, Welding, Grinding · ISO 9001, ITAR | Rock Valley, IA | MillingTurningWeldingGrinding | ISO 9001, ITAR |
| Vector Technologies, Inc Milling, Waterjet, Welding, Grinding · ISO 9001, AS9100, ITAR | Winfield, KS | MillingWaterjetWeldingGrinding | ISO 9001, AS9100, ITAR |