| Sharp Tooling Company Milling, Turning, Bending, Welding, Waterjet, EDM, Stamping, Metal AM | Buffalo, NY | MillingTurningBendingWeldingWaterjetEDMStampingMetal AM | - |
| Siddhi Integrated Manufacturing Services Inc Milling, Turning, Swiss, Stamping, EDM · ISO 9001, ITAR | Clarksville, IN | MillingTurningSwissStampingEDM | ISO 9001, ITAR |
| Smith & Richardson Manufacturing Co Milling, Stamping, Casting | Geneva, IL | MillingStampingCasting | - |
| Southern Precision, Inc Milling, Turning, Stamping | Saint Rose, LA | MillingTurningStamping | - |
| Southwest Greene International Inc Milling, Turning, Stamping, Metal AM, EDM | Oceanside, CA | MillingTurningStampingMetal AMEDM | - |
| Specialty Tool & Die Company Inc Milling, Turning, Bending, Welding, Stamping, Grinding, Assembly | Kokomo, IN | MillingTurningBendingWeldingStampingGrindingAssembly | - |
| Stampings of Minnesota Inc Laser, Bending, Stamping · ISO 9001, AS9100 | Lakeville, MN | LaserBendingStamping | ISO 9001, AS9100 |
| Statt Engineering LLC Milling, Stamping · AS9100, ITAR | Martinsville, IN | MillingStamping | AS9100, ITAR |
| Steel-Craft Corp. of Hartford Milling, Laser, Punching, Bending, Welding, Stamping, Finishing | Hartford, WI | MillingLaserPunchingBendingWeldingStampingFinishing | - |
| Strickland Machine Co LLC Milling, Turning, Welding, Stamping, Grinding, Finishing, Assembly | North Chesterfield, VA | MillingTurningWeldingStampingGrindingFinishingAssembly | - |
| Summit Machining Co., Ltd Milling, Turning, Welding, Stamping, Casting, Finishing | Mogadore, OH | MillingTurningWeldingStampingCastingFinishing | - |
| Superior Tooling Inc Milling, Turning, Swiss, Bending, Welding, Stamping, EDM, Grinding · ISO 9001 | Wapello, IA | MillingTurningSwissBendingWeldingStampingEDMGrinding | ISO 9001 |
| Swiss Technologies Inc. Milling, Turning, Welding, Stamping · ISO 9001 | Knoxville, TN | MillingTurningWeldingStamping | ISO 9001 |
| Tanfel, Inc Milling, Stamping, Casting · ISO 9001 | Scottsdale, AZ | MillingStampingCasting | ISO 9001 |
| Tem Inc Milling, Laser, Welding, Stamping, EDM, Assembly · ISO 9001, AS9100 | Buxton, ME | MillingLaserWeldingStampingEDMAssembly | ISO 9001, AS9100 |
| The Charles Schillinger Co., Inc Turning, Welding, Stamping · ISO 9001 | Bensalem, PA | TurningWeldingStamping | ISO 9001 |
| The Part Company, LLC Milling, Laser, Punching, Bending, Stamping, Metal AM, Finishing | Acworth, GA | MillingLaserPunchingBendingStampingMetal AMFinishing | - |
| Thompson Machine Bending, Stamping · ISO 9001 | Albuquerque, NM | BendingStamping | ISO 9001 |
| Tico Tooling LLC Milling, Turning, Stamping, EDM, Grinding · ISO 9001 | San Marcos, TX | MillingTurningStampingEDMGrinding | ISO 9001 |
| Toledo Metal Spinning Company Milling, Bending, Laser, Welding, Stamping · ISO 9001 | Toledo, OH | MillingBendingLaserWeldingStamping | ISO 9001 |
| 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 |
| Trio Metal Stamping, Inc Milling, Turning, Laser, Bending, Welding, Stamping, EDM, Grinding · ISO 9001, NADCAP | City Of Industry, CA | MillingTurningLaserBendingWeldingStampingEDMGrinding | ISO 9001, NADCAP |
| U.m.c., Inc Milling, Turning, Welding, Stamping, EDM, Grinding, Finishing · ISO 9001, ITAR, ISO 13485 | Monticello, MN | MillingTurningWeldingStampingEDMGrindingFinishing | ISO 9001, ITAR, ISO 13485 |
| Udash Corporation Milling, Laser, Waterjet, Welding, Stamping, Assembly · ISO 9001, AS9100 | Simi Valley, CA | MillingLaserWaterjetWeldingStampingAssembly | ISO 9001, AS9100 |
| Ultimate Hydroforming, Inc Laser, Welding, Stamping · ISO 9001, AS9100, ITAR, NADCAP | Sterling Heights, MI | LaserWeldingStamping | ISO 9001, AS9100, ITAR, NADCAP |
| Ultra Tool and Mfg., Inc Milling, Turning, Laser, Bending, Welding, Stamping, EDM, Finishing · ISO 9001, ITAR | Germantown, WI | MillingTurningLaserBendingWeldingStampingEDMFinishing | ISO 9001, ITAR |
| United Western Industries Inc. Milling, Bending, Laser, Welding, Stamping · IATF 16949 | Fresno, CA | MillingBendingLaserWeldingStamping | IATF 16949 |
| Universal Tools & Manufacturing Co Turning, Punching, Bending, Stamping · ISO 9001, AS9100 | Springfield, NJ | TurningPunchingBendingStamping | ISO 9001, AS9100 |
| USWP Manufacturing Bending, Stamping, Finishing · AS9100, NADCAP | Spokane Valley, WA | BendingStampingFinishing | AS9100, NADCAP |
| Valley City Metal Products Milling, Turning, Laser, Stamping · ISO 9001 | Shelby, MI | MillingTurningLaserStamping | ISO 9001 |
| Vptt Armaments Milling, Turning, Laser, Waterjet, Bending, Welding, Stamping, EDM, Grinding, Assembly · ISO 9001, ITAR | Tower City, PA | MillingTurningLaserWaterjetBendingWeldingStampingEDMGrindingAssembly | ISO 9001, ITAR |
| Walker West LLC Bending, Welding, Stamping, Assembly | Ontario, CA | BendingWeldingStampingAssembly | - |
| Well Bilt Power Systems LLC Milling, Turning, Welding, Stamping | Union, NJ | MillingTurningWeldingStamping | - |
| Wozniak Industries Inc Welding, Stamping, Forging | Schaumburg, IL | WeldingStampingForging | - |
| Wrobel Engineering Co. Inc Milling, Turning, Punching, Welding, Stamping, Grinding, Assembly | Avon, MA | MillingTurningPunchingWeldingStampingGrindingAssembly | - |
| Xact Tool Bending, Welding, Stamping | Shell Lake, WI | BendingWeldingStamping | - |
| Xact Wire EDM Corp Milling, Stamping, EDM · ISO 9001 | Waukesha, WI | MillingStampingEDM | ISO 9001 |
| Yardarm Fabrication Milling, Turning, Bending, Laser, Welding, Stamping | Indianapolis, IN | MillingTurningBendingLaserWeldingStamping | - |