| Cutco Metal Sawing LLC Milling, Turning, Welding, Grinding | Burleson, TX | MillingTurningWeldingGrinding | - |
| Cutter Innovations, LLC Milling, Turning, EDM · AS9100 | Wheat Ridge, CO | MillingTurningEDM | AS9100 |
| Cutting Edge Machining & Automation-Qtr, LLC Milling, Turning, Swiss, Laser, Welding, EDM, Assembly | North Versailles, PA | MillingTurningSwissLaserWeldingEDMAssembly | - |
| Cutting Source Precision Milling, Turning, Bending, Welding, EDM, Stamping · ISO 9001 | Houston, TX | MillingTurningBendingWeldingEDMStamping | ISO 9001 |
| Cyclefab, LLC Milling, Turning, Welding | Renton, WA | MillingTurningWelding | - |
| D & D Automation Inc Milling, Turning, Welding, EDM | Terre Haute, IN | MillingTurningWeldingEDM | - |
| D & G Machine Products, LLC Milling, Turning, Bending, Laser, Welding · ISO 9001, AS9100 | Gorham, ME | MillingTurningBendingLaserWelding | ISO 9001, AS9100 |
| D & H Industries Inc Milling, Turning, Laser, Bending, Welding, Stamping, Grinding, Finishing · ISO 9001, ITAR | Oconomowoc, WI | MillingTurningLaserBendingWeldingStampingGrindingFinishing | ISO 9001, ITAR |
| D & S Manufacturing, Inc Milling, Turning, Assembly · ISO 9001, ITAR | Wichita, KS | MillingTurningAssembly | ISO 9001, ITAR |
| D. J. Fabricators, Inc Milling, Laser, Waterjet, Punching, Bending, Welding, EDM, Grinding, Assembly · ISO 9001 | Ipswich, MA | MillingLaserWaterjetPunchingBendingWeldingEDMGrindingAssembly | ISO 9001 |
| D.P. Tool Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100, ITAR | Avon, NY | MillingTurningWeldingEDMGrindingAssembly | ISO 9001, AS9100, ITAR |
| D&D Enterprises of Greensboro Inc Milling, Turning, Swiss, Assembly · ISO 9001, AS9100 | Randleman, NC | MillingTurningSwissAssembly | ISO 9001, AS9100 |
| D&J Technologies Inc. Milling, Turning · ISO 9001, AS9100 | Fort Worth, TX | MillingTurning | ISO 9001, AS9100 |
| Daico Precision LLC Milling, Turning, Grinding, Finishing, Assembly | Garden Grove, CA | MillingTurningGrindingFinishingAssembly | - |
| Dallas Precision Machining Milling, Turning, Bending, Laser, Welding, Waterjet, Metal AM · ISO 9001, AS9100, ITAR | Carrollton, TX | MillingTurningBendingLaserWeldingWaterjetMetal AM | ISO 9001, AS9100, ITAR |
| Danser, Inc Milling, Laser, Punching, Bending, Welding | Davisville, WV | MillingLaserPunchingBendingWelding | - |
| David Packard Company, Inc Milling, Turning, Swiss, Grinding, Finishing, Assembly · ISO 9001, ITAR | Oxford, MA | MillingTurningSwissGrindingFinishingAssembly | ISO 9001, ITAR |
| Davis Manufacturing Co Milling, Turning, Welding, Finishing · AS9100, ITAR, CMMC | Wheat Ridge, CO | MillingTurningWeldingFinishing | AS9100, ITAR, CMMC |
| Davis Tool & Die, Inc Milling, Turning, Welding, Stamping, EDM, Grinding | Abbeville, MS | MillingTurningWeldingStampingEDMGrinding | - |
| Davis Tool Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP | Hillsboro, OR | MillingTurningLaserWaterjetPunchingBendingWeldingEDMGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP |
| Dawid Manufacturing Inc Milling, Welding | Ansonia, CT | MillingWelding | - |
| Dearborn, Inc Milling, Grinding | Berea, OH | MillingGrinding | - |
| Dechert Dynamics Corp Milling, Turning, Welding, Grinding · ISO 9001 | Palmyra, PA | MillingTurningWeldingGrinding | ISO 9001 |
| Decimal Engineering Milling, Turning, Laser, Stamping, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP | Coral Springs, FL | MillingTurningLaserStampingEDMGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP |
| Dellinger Enterprises, Ltd Milling, Turning, Laser, Bending, Welding, Stamping, Finishing | Belmont, NC | MillingTurningLaserBendingWeldingStampingFinishing | - |
| Delt Forge, Inc Milling, Turning, Welding, Forging, Grinding | Rose City, MI | MillingTurningWeldingForgingGrinding | - |
| 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 |
| Deltisan Engineering LLC Milling, Turning, Punching, Bending, Welding, Finishing, Assembly · ISO 9001 | Parker, CO | MillingTurningPunchingBendingWeldingFinishingAssembly | ISO 9001 |
| Demco Products Milling, Turning, Swiss, Finishing, Assembly · ISO 9001 | Oak Lawn, IL | MillingTurningSwissFinishingAssembly | ISO 9001 |
| Deperini Metal Fabricators Milling, Laser, Punching, Bending, Welding, Grinding, Finishing · ISO 9001 | Gaithersburg, MD | MillingLaserPunchingBendingWeldingGrindingFinishing | ISO 9001 |
| Derecktor Marine Technology LLC Milling, Turning, Waterjet, Welding | Bristol, RI | MillingTurningWaterjetWelding | - |
| Desalvo Systems Inc Milling, Turning · ITAR | Yuma, AZ | MillingTurning | ITAR |
| Desemco, LLC Milling, Turning, Laser · AS9100 | Marietta, GA | MillingTurningLaser | AS9100 |
| Desert Engineering Group Inc Milling, Turning, Stamping, Grinding | Tucson, AZ | MillingTurningStampingGrinding | - |
| Design Metal, Inc Milling, Turning, Bending, Welding, Stamping · ISO 9001 | Oak Park, MI | MillingTurningBendingWeldingStamping | ISO 9001 |
| Dessureau Machines Inc Milling, Turning, Welding | Berlin, VT | MillingTurningWelding | - |
| Dexter Design & Development Co Milling, Turning, EDM, Grinding, Assembly · ISO 9001 | Hillsboro, OR | MillingTurningEDMGrindingAssembly | ISO 9001 |
| Diamond Die and Mold Milling, EDM, Grinding, Finishing · ISO 9001 | Clinton Township, MI | MillingEDMGrindingFinishing | ISO 9001 |
| Diamond Machine Works, Inc. Milling, Turning · ISO 9001, AS9100 | Seattle, WA | MillingTurning | ISO 9001, AS9100 |
| Diamond Turning Innovations, LLC Milling, Turning, Grinding | Milford, NH | MillingTurningGrinding | - |
| Diamond W Custom Machine Works LLC Milling, Turning, Laser, Waterjet, Welding, Finishing | Phillipsburg, KS | MillingTurningLaserWaterjetWeldingFinishing | - |
| Digitrace Machine Works Ltd Milling, Welding, Stamping, Finishing | Wayland, MI | MillingWeldingStampingFinishing | - |
| Distinctive Machining LLC Milling, Welding, Grinding, Finishing | Zeeland, MI | MillingWeldingGrindingFinishing | - |
| Diversitech Inc Milling, Turning, Assembly · ISO 9001 | Riverdale, NJ | MillingTurningAssembly | ISO 9001 |
| Dix Metals Milling, Waterjet, Welding, Stamping, Grinding | Huntington Beach, CA | MillingWaterjetWeldingStampingGrinding | - |
| Dixon Tool & Die Co Inc Milling, Turning, Waterjet, Welding, EDM, Grinding · ISO 9001, CMMC | Tyrone, PA | MillingTurningWaterjetWeldingEDMGrinding | ISO 9001, CMMC |
| DK Machining LLC Milling, Turning, Welding, Assembly · ISO 9001, ITAR | Molalla, OR | MillingTurningWeldingAssembly | ISO 9001, ITAR |
| Dolphin Manufacturing, Inc Milling, Turning, Finishing, Assembly · ISO 9001 | Taylor, MI | MillingTurningFinishingAssembly | ISO 9001 |
| Domaille Engineering, LLC Milling, Turning, Welding, EDM, Grinding, Assembly | Rochester, MN | MillingTurningWeldingEDMGrindingAssembly | - |