| Columbia Machine Works, Inc Milling, Turning, Welding, Stamping, Casting · ISO 9001, ITAR | Columbia, TN | MillingTurningWeldingStampingCasting | ISO 9001, ITAR |
| Columbia Asc Inc Milling, Turning, Laser, Waterjet, Bending, Welding, Stamping, EDM · ISO 9001 | Lawrence, MA | MillingTurningLaserWaterjetBendingWeldingStampingEDM | ISO 9001 |
| Allied Industrial Machine Services Inc Milling, Turning, Welding, Grinding, Finishing | Falls Church, VA | MillingTurningWeldingGrindingFinishing | - |
| Akt Manufacturing LLC Milling | Columbia, KY | Milling | - |
| Baiar Industries Milling, Turning, Welding, EDM | Columbia Falls, MT | MillingTurningWeldingEDM | - |
| Harlyn Jean Machining LLC Milling · AS9100, ITAR | Columbia Falls, MT | Milling | AS9100, ITAR |
| Helanbak, LLC Milling, Turning, Waterjet, Welding | Columbia, MS | MillingTurningWaterjetWelding | - |
| JMS Machine, Inc Milling, Turning, EDM, Grinding | Columbia City, IN | MillingTurningEDMGrinding | - |
| Kilgore Manufacturing Co Inc Milling, Swiss, Bending, Welding, EDM, Finishing, Assembly · ISO 9001, ITAR | Columbia City, IN | MillingSwissBendingWeldingEDMFinishingAssembly | ISO 9001, ITAR |
| Susquehanna Metal Work, LLC Milling, Bending, Welding, Stamping | Columbia, PA | MillingBendingWeldingStamping | - |
| GN Manufacturing LLC Milling, Turning, Swiss | Granite Falls, WA | MillingTurningSwiss | - |
| Rensberger Technologies Milling, Turning, EDM · AS9100, ITAR, CMMC | Sioux Falls, SD | MillingTurningEDM | AS9100, ITAR, CMMC |
| Wisconsin Metal Fab LLC Milling, Laser, Punching, Bending, Welding | Chippewa Falls, WI | MillingLaserPunchingBendingWelding | - |