| Protool Co Milling, Turning, Swiss · ISO 9001 | Tustin, CA | MillingTurningSwiss | ISO 9001 |
| R&D Machine LLC Milling, Assembly | Murrieta, CA | MillingAssembly | - |
| R&H Machine Milling, Welding · ISO 9001 | Longview, TX | MillingWelding | ISO 9001 |
| RC Supply Corp Bending, Welding | Freeport, NY | BendingWelding | - |
| Reardon Machine Co Inc Milling, Turning, Welding, Stamping, EDM, Grinding | Saint Joseph, MO | MillingTurningWeldingStampingEDMGrinding | - |
| Regal Research & Manufacturing Co LLC Milling, Turning, Bending, Welding, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR | Plano, TX | MillingTurningBendingWeldingGrindingFinishingAssembly | ISO 9001, AS9100, ITAR |
| Relentless Machine Milling, Turning, EDM | Roy, UT | MillingTurningEDM | - |
| Restless Machines LLC Milling, Turning | Greenville, SC | MillingTurning | - |
| Rivtec LLC Laser, Bending, Welding, Assembly | Santa Ana, CA | LaserBendingWeldingAssembly | - |
| RMC Engine Rebuilding Equipment, Inc Milling | Saginaw, MI | Milling | - |
| Roller Technologies Co Milling, Turning, Welding, Finishing, Assembly | Upland, CA | MillingTurningWeldingFinishingAssembly | - |
| S & S Commercial Fishing Equipment, Incorporated Milling, Turning, Welding | Roseville, CA | MillingTurningWelding | - |
| S&H Engineering, Inc Milling · ITAR | Chelmsford, MA | Milling | ITAR |
| Samss Refacer, Inc Milling, Turning, Waterjet | Laurel, MT | MillingTurningWaterjet | - |
| Selective Industries, Inc Laser, Welding, Stamping · ISO 9001 | Marine City, MI | LaserWeldingStamping | ISO 9001 |
| Serrmi Products LLC Milling, Turning, Laser, Punching, Bending, Finishing | Pittsburg, KS | MillingTurningLaserPunchingBendingFinishing | - |
| Seyer Industries Inc Welding, EDM, Assembly | Saint Peters, MO | WeldingEDMAssembly | - |
| Sharp Dimension Inc Milling, Turning, Bending, Welding, Grinding, Finishing, Assembly · ISO 9001, ITAR | Fremont, CA | MillingTurningBendingWeldingGrindingFinishingAssembly | ISO 9001, ITAR |
| Shaw Industries Co. LLC Milling, Turning, Welding, EDM · ISO 9001, ITAR | Franklin, PA | MillingTurningWeldingEDM | ISO 9001, ITAR |
| Shrettech Tool & Machine LLC Milling, Turning, Welding, Grinding | Racine, WI | MillingTurningWeldingGrinding | - |
| Skillcraft Machine Tool Co Inc Milling, Turning, Welding | South Windsor, CT | MillingTurningWelding | - |
| Smtautomation LLC Milling, Laser, Welding · ISO 9001, ITAR | Bruce Township, MI | MillingLaserWelding | ISO 9001, ITAR |
| Solvers Manufacturing Turning, Bending, Welding | Springfield, NE | TurningBendingWelding | - |
| Specialty Steel Supply Co., Inc Punching, Bending, Welding | Fairless Hills, PA | PunchingBendingWelding | - |
| Speed Fabrication LLC Laser, Bending, Welding, Finishing | Perryville, MO | LaserBendingWeldingFinishing | - |
| Standard Locknut, LLC Milling, Turning | Westfield, IN | MillingTurning | - |
| Stanley Machining & Tool Corp Milling, Turning · ISO 9001 | Carpentersville, IL | MillingTurning | ISO 9001 |
| Streich Bros Inc Milling, Welding | Tacoma, WA | MillingWelding | - |
| Summit City Precision Machining LLC Milling, Turning, EDM · ISO 9001 | Fort Wayne, IN | MillingTurningEDM | ISO 9001 |
| Summit Machine Solutions Milling, Welding | Akron, OH | MillingWelding | - |
| Summit Machine Solutions LLC Milling, Welding, Grinding | Akron, OH | MillingWeldingGrinding | - |
| Surge Manufacturing LLC Milling · ISO 9001, AS9100, ITAR, CMMC | Otsego, MN | Milling | ISO 9001, AS9100, ITAR, CMMC |
| Swift Industries Inc Milling, Laser, Punching, Bending, Welding, Stamping, Grinding, Finishing, Assembly · ISO 9001 | Suwanee, GA | MillingLaserPunchingBendingWeldingStampingGrindingFinishingAssembly | ISO 9001 |
| Swissomation Inc Milling · ISO 9001, ITAR | Fredericksburg, TX | Milling | ISO 9001, ITAR |
| Takt Manufacturing, LLC Waterjet | Centennial, CO | Waterjet | - |
| Tampa Bay Machining Milling, Turning, Welding, EDM · ISO 9001, AS9100, ITAR | Tampa, FL | MillingTurningWeldingEDM | ISO 9001, AS9100, ITAR |
| TBT Machining Milling | Fremont, CA | Milling | - |
| Technical Services Incorporated Milling, Turning, Welding · ISO 9001 | Ames, IA | MillingTurningWelding | ISO 9001 |
| Tessec LLC Milling, Welding, EDM, Grinding, Assembly · AS9100 | Dayton, OH | MillingWeldingEDMGrindingAssembly | AS9100 |
| Texas Metal Specialty Co Laser, Welding, Waterjet | Houston, TX | LaserWeldingWaterjet | - |
| The Champ Company Welding, Assembly | Campbell, CA | WeldingAssembly | - |
| ThermoAir Grinding | Burbank, CA | Grinding | - |
| Thompson & Smith Industries LLC Milling, Turning, Welding, EDM, Grinding | Tullahoma, TN | MillingTurningWeldingEDMGrinding | - |
| Toolcraft Inc Milling, Turning · ISO 9001, ITAR | Monroe, WA | MillingTurning | ISO 9001, ITAR |
| Topnotch Quality Works Milling, Turning · ISO 9001, ITAR | Pacoima, CA | MillingTurning | ISO 9001, ITAR |
| Topocut, LLC Milling, Laser, Bending, Finishing | Berthoud, CO | MillingLaserBendingFinishing | - |
| Trans Machine Technologies SC Milling, Turning, Bending, Laser, Welding, EDM, Casting · ISO 9001 | Greenville, SC | MillingTurningBendingLaserWeldingEDMCasting | ISO 9001 |
| Trident Precision Manufacturing Inc Welding, Stamping, Finishing, Assembly · ISO 9001, AS9100, ITAR, ISO 13485 | Webster, NY | WeldingStampingFinishingAssembly | ISO 9001, AS9100, ITAR, ISO 13485 |
| Trussworks International Inc Bending, Welding · ISO 9001 | Pomona, CA | BendingWelding | ISO 9001 |
| TT & L Sheet Metal Inc Bending | Beaverton, OR | Bending | - |