| Conti Tool & Die, Inc Milling, Turning, Bending, Welding, Grinding | Akron, OH | MillingTurningBendingWeldingGrinding | - |
| Continental Machining Co Milling, Turning, Welding, EDM | Albuquerque, NM | MillingTurningWeldingEDM | - |
| Covert Manufacturing, Inc Milling, Turning, Welding, Grinding · ISO 9001, ITAR, IATF 16949 | Galion, OH | MillingTurningWeldingGrinding | ISO 9001, ITAR, IATF 16949 |
| Criterion Manufacturing Turning, Welding | Waterloo, IA | TurningWelding | - |
| Critical Components-Oil & Gas Milling, Turning, Welding, Metal AM, Finishing | Oklahoma City, OK | MillingTurningWeldingMetal AMFinishing | - |
| Cuevas Machine Co., Inc Welding | Poplarville, MS | Welding | - |
| Cumberland Machine Co Milling, Turning, Welding | Nashville, TN | MillingTurningWelding | - |
| Custom Engineering Co Milling, Turning, Bending, Welding · ISO 9001, ITAR, NADCAP | Erie, PA | MillingTurningBendingWelding | ISO 9001, ITAR, NADCAP |
| Custom Machine Milling, Turning, Welding, Grinding | Hagerstown, MD | MillingTurningWeldingGrinding | - |
| Custom Machine & Welding, Inc Turning, Waterjet, Bending, Welding, Grinding, Finishing | North Augusta, SC | TurningWaterjetBendingWeldingGrindingFinishing | - |
| Custom Manufacturing Services, Inc Laser, Welding, Finishing, Assembly · ISO 9001 | Princeton, WV | LaserWeldingFinishingAssembly | ISO 9001 |
| Cutting Solutions Turning, Laser, Waterjet, Bending, Welding, Grinding, Finishing, Assembly | Zeeland, MI | TurningLaserWaterjetBendingWeldingGrindingFinishingAssembly | - |
| CV International, Inc Milling, Turning, Laser, Punching, Bending, Welding · ISO 9001 | Bend, OR | MillingTurningLaserPunchingBendingWelding | ISO 9001 |
| Dahlgren Technologies LLC Welding | King George, VA | Welding | - |
| Dark Threat Fabrication LLC Milling, Turning, Laser, Bending, Welding, Finishing · ISO 9001 | Heber Springs, AR | MillingTurningLaserBendingWeldingFinishing | ISO 9001 |
| Davis Manufacturing Co Milling, Turning, Welding, Finishing · AS9100, ITAR, CMMC | Wheat Ridge, CO | MillingTurningWeldingFinishing | AS9100, ITAR, CMMC |
| DCP Tool Manufacturing, LLC Milling, Turning, Laser, Welding, EDM, Grinding, Finishing | Dayton, OH | MillingTurningLaserWeldingEDMGrindingFinishing | - |
| Delflo Industries Inc Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100, ITAR, ISO 13485, CMMC | Delray Beach, FL | MillingTurningWaterjetBendingWeldingEDMGrindingAssembly | ISO 9001, AS9100, ITAR, ISO 13485, CMMC |
| Delta Hi-Tech Milling, Turning, Swiss, Laser, Bending, Welding, EDM, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 | Chatsworth, CA | MillingTurningSwissLaserBendingWeldingEDMFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 |
| Delta Machining Inc Milling, Turning, Welding, Grinding · ISO 9001 | Niles, MI | MillingTurningWeldingGrinding | ISO 9001 |
| Delta One Manufacturing LLC Milling, Turning, Laser, Welding, Finishing, Assembly | San Jose, CA | MillingTurningLaserWeldingFinishingAssembly | - |
| Denali MetalWorks Bending, Laser, Welding, Waterjet | Phoenix, AZ | BendingLaserWeldingWaterjet | - |
| Derecktor Marine Technology LLC Milling, Turning, Waterjet, Welding | Bristol, RI | MillingTurningWaterjetWelding | - |
| Deweys Service Company, LLC Laser, Welding, Grinding | Columbia, SC | LaserWeldingGrinding | - |
| DGF Industrial Innovations Group, Ltd Milling, Turning, Bending, Welding · ISO 9001 | Gilford, NH | MillingTurningBendingWelding | ISO 9001 |
| Diamond Manufacturing of Bluffton, Ltd Laser, Welding, Assembly | Bluffton, OH | LaserWeldingAssembly | - |
| Die Craft Milling, Turning, Welding, Waterjet · ISO 9001 | Cincinnati, OH | MillingTurningWeldingWaterjet | ISO 9001 |
| Donahue Industries, Incorporated Milling, Turning, Swiss, Punching, Bending, Welding, Stamping, EDM, Grinding, Finishing | Shrewsbury, MA | MillingTurningSwissPunchingBendingWeldingStampingEDMGrindingFinishing | - |
| Dothan Steel Fabricators, LLC Welding | Dothan, AL | Welding | - |
| Drews Fabrication and Welding LLC Welding | Longview, WA | Welding | - |
| Dualtron Manufacturing Milling, Laser, Punching, Welding, Finishing, Assembly | West Babylon, NY | MillingLaserPunchingWeldingFinishingAssembly | - |
| Dynamic Design & Manufacturing Inc Laser, Punching, Bending, Welding, EDM · ISO 9001, AS9100, ITAR | Niwot, CO | LaserPunchingBendingWeldingEDM | ISO 9001, AS9100, ITAR |
| Dynamic Marine Machining Welding | Spring Valley, CA | Welding | - |
| Dynamic Sheetmetal Fabrication, LLC Bending, Welding · ISO 9001 | St Paul, MN | BendingWelding | ISO 9001 |
| East Coast Welding and Fabrication, LLC Turning, Welding, Finishing, Assembly | Newburyport, MA | TurningWeldingFinishingAssembly | - |
| Eastwood Machine, LLC Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding, Finishing, Assembly | Santee, CA | MillingTurningLaserWaterjetWeldingEDMGrindingFinishingAssembly | - |
| Eccentroid LLC Milling, Welding, Stamping | Loveland, CO | MillingWeldingStamping | - |
| Echelbarger Precision Machining Milling, Swiss, Waterjet, Bending, Welding, EDM, Finishing · ISO 9001 | Kokomo, IN | MillingSwissWaterjetBendingWeldingEDMFinishing | ISO 9001 |
| Eclipse Dynamics LLC Milling, Welding, Assembly · ITAR | Titusville, FL | MillingWeldingAssembly | ITAR |
| Ed Dangs Machine Works Inc Milling, Turning, Welding, Grinding, Finishing | Honolulu, HI | MillingTurningWeldingGrindingFinishing | - |
| Electronic Sheetmetal Bending, Welding | Melbourne, FL | BendingWelding | - |
| eMachineShop Milling, Turning, Bending, Laser, Welding, Waterjet, Stamping, Metal AM · ITAR | Mahwah, NJ | MillingTurningBendingLaserWeldingWaterjetStampingMetal AM | ITAR |
| Engineering Design Industries, Inc Milling, Turning, Laser, Welding, Stamping, EDM, Grinding, Finishing | S El Monte, CA | MillingTurningLaserWeldingStampingEDMGrindingFinishing | - |
| Enterprise CNC Machining LLC Milling, Turning, Swiss, Welding, Casting | Mankato, MN | MillingTurningSwissWeldingCasting | - |
| EnviroTech Milling, Turning, Laser, Welding, EDM | Boise, ID | MillingTurningLaserWeldingEDM | - |
| Essner Manufacturing LP Milling, Punching, Welding, Assembly · NADCAP | Fort Worth, TX | MillingPunchingWeldingAssembly | NADCAP |
| Evansville Sheet Metal Works Bending, Laser, Welding, Waterjet | Evansville, IN | BendingLaserWeldingWaterjet | - |
| Excel Manufacturing Inc Milling, Turning, Swiss, Waterjet, Welding, EDM, Grinding, Finishing · ITAR | Albuquerque, NM | MillingTurningSwissWaterjetWeldingEDMGrindingFinishing | ITAR |
| Expedite Precision Works Inc Milling, Turning, Swiss, Welding, EDM, Finishing · ISO 9001, AS9100, ITAR, ISO 13485 | San Jose, CA | MillingTurningSwissWeldingEDMFinishing | ISO 9001, AS9100, ITAR, ISO 13485 |
| Experimental Machine Inc Milling, Waterjet, Welding, Assembly · ISO 9001, AS9100, ITAR, CMMC | New Freedom, PA | MillingWaterjetWeldingAssembly | ISO 9001, AS9100, ITAR, CMMC |