| USA Custom Stainless Punching, Bending, Welding | Saint Louis, MO | PunchingBendingWelding | - |
| Davlan Engineering Inc Milling, Turning, Laser, Welding, Stamping | Saint Louis, MO | MillingTurningLaserWeldingStamping | - |
| Enc Products, Co Milling, Finishing | Sainte Genevieve, MO | MillingFinishing | - |
| JK Pulley Co Inc Milling, Turning, Welding | Saint Louis, MO | MillingTurningWelding | - |
| Midwest Machining Solutions LLC Milling, Turning, Waterjet, Welding, Assembly | Saint Louis, MO | MillingTurningWaterjetWeldingAssembly | - |
| Precision Components & Assemblies, Inc Milling, Turning, Laser, Welding, Casting, Finishing, Assembly | Saint Peters, MO | MillingTurningLaserWeldingCastingFinishingAssembly | - |
| R & S Machining Inc Milling, Turning, Welding, EDM, Grinding · ISO 9001, AS9100 | Saint Louis, MO | MillingTurningWeldingEDMGrinding | ISO 9001, AS9100 |
| Reardon Machine Co Inc Milling, Turning, Welding, Stamping, EDM, Grinding | Saint Joseph, MO | MillingTurningWeldingStampingEDMGrinding | - |
| Seyer Industries Inc Welding, EDM, Assembly | Saint Peters, MO | WeldingEDMAssembly | - |
| Jones & Lockhart Fabrication LLC Bending, Welding | St. Louis, MO | BendingWelding | - |
| H&H Metal Fabrication Bending, Welding | St. Louis, MO | BendingWelding | - |
| M B Steel Milling, Bending, Laser, Welding, Stamping | St. Louis, MO | MillingBendingLaserWeldingStamping | - |
| Sullivan Precision Metal Finishing Finishing · AS9100, ITAR | Sullivan, MO | Finishing | AS9100, ITAR |
| The Toolroom, Inc Milling, Punching, Welding, EDM | Owensville, MO | MillingPunchingWeldingEDM | - |