| Dark Threat Fabrication LLC Milling, Turning, Laser, Bending, Welding, Finishing · ISO 9001 | Heber Springs, AR | MillingTurningLaserBendingWeldingFinishing | ISO 9001 |
| Davis Tool & Die, Inc Milling, Turning, Welding, Stamping, EDM, Grinding | Abbeville, MS | MillingTurningWeldingStampingEDMGrinding | - |
| Dechert Dynamics Corp Milling, Turning, Welding, Grinding · ISO 9001 | Palmyra, PA | MillingTurningWeldingGrinding | ISO 9001 |
| Defense & Aerospace Manufacturing LLC Welding, Grinding, Finishing, Assembly | Rancho Cordova, CA | WeldingGrindingFinishingAssembly | - |
| Denali MetalWorks Bending, Laser, Welding, Waterjet | Phoenix, AZ | BendingLaserWeldingWaterjet | - |
| Denison Industries, Inc Welding, Casting, Grinding · ISO 9001, AS9100, ITAR, NADCAP | Denison, TX | WeldingCastingGrinding | ISO 9001, AS9100, ITAR, NADCAP |
| 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 | - |
| Des Moines Iron & Supply Co Bending, Welding | Des Moines, IA | BendingWelding | - |
| Des Moines Metal Fab Bending, Laser, Welding | Des Moines, IA | BendingLaserWelding | - |
| Desert Metal Works Bending, Laser, Welding, Waterjet | Tucson, AZ | BendingLaserWeldingWaterjet | - |
| Desert Precision Manufacturing Bending, Laser, Welding · ISO 9001 | Tucson, AZ | BendingLaserWelding | ISO 9001 |
| 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 | - |
| Deuterium Ims LLC Welding | Attleboro, MA | Welding | - |
| Deval Life Cycle Support LLC Milling, Turning, Welding, Assembly · ISO 9001, AS9100 | Philadelphia, PA | MillingTurningWeldingAssembly | ISO 9001, AS9100 |
| 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 | - |
| Diamond W Custom Machine Works LLC Milling, Turning, Laser, Waterjet, Welding, Finishing | Phillipsburg, KS | MillingTurningLaserWaterjetWeldingFinishing | - |
| Die Craft Milling, Turning, Welding, Waterjet · ISO 9001 | Cincinnati, OH | MillingTurningWeldingWaterjet | ISO 9001 |
| Die-Cut Products Co Bending, Laser, Welding, Waterjet, EDM, Stamping | Cleveland, OH | BendingLaserWeldingWaterjetEDMStamping | - |
| Distinctive Machining LLC Milling, Welding, Grinding, Finishing | Zeeland, MI | MillingWeldingGrindingFinishing | - |
| Diverse Metal Products Bending, Laser, Welding, Stamping · ISO 9001 | Houston, TX | BendingLaserWeldingStamping | ISO 9001 |
| Diversified Machining Inc Milling, Welding | Forest Hill, MD | MillingWelding | - |
| 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 |
| Dms-South/bailey Tool LLC Milling, Turning, Welding, Stamping, EDM | Lancaster, TX | MillingTurningWeldingStampingEDM | - |
| Donahue Industries, Incorporated Milling, Turning, Swiss, Punching, Bending, Welding, Stamping, EDM, Grinding, Finishing | Shrewsbury, MA | MillingTurningSwissPunchingBendingWeldingStampingEDMGrindingFinishing | - |
| Donal Machine Inc Laser, Welding, Finishing · NADCAP | Petaluma, CA | LaserWeldingFinishing | NADCAP |
| Donsco, Inc Milling, Welding, Casting | Wrightsville, PA | MillingWeldingCasting | - |
| Douglas Machine & Engineering Milling, Turning, Bending, Welding, EDM · ISO 9001, AS9100, ITAR, CMMC | Davenport, IA | MillingTurningBendingWeldingEDM | ISO 9001, AS9100, ITAR, CMMC |
| Draeving Machine Tool, Inc Milling, Turning, Welding, EDM | Beloit, WI | MillingTurningWeldingEDM | - |
| Dresco Machining & Fabrication Milling, Turning, Waterjet, Welding · ISO 9001 | Bay City, MI | MillingTurningWaterjetWelding | ISO 9001 |
| DRM Industries Corp Milling, Turning, Laser, Welding, Casting · ISO 9001 | Lake Delton, WI | MillingTurningLaserWeldingCasting | ISO 9001 |
| Dualtron Manufacturing Milling, Laser, Punching, Welding, Finishing, Assembly | West Babylon, NY | MillingLaserPunchingWeldingFinishingAssembly | - |
| Dupage Machine Products, Inc Welding, EDM | Bloomingdale, IL | WeldingEDM | - |
| Dutchy Enterprises LLC Milling, Waterjet, Welding | Cocoa, FL | MillingWaterjetWelding | - |
| DW Engineering LLC Milling, Turning, Welding | Burnsville, MN | MillingTurningWelding | - |
| DW Products Milling, Turning, Bending, Welding, Waterjet · ISO 9001, ITAR | Cedar Rapids, IA | MillingTurningBendingWeldingWaterjet | ISO 9001, ITAR |
| Dynamic Design & Manufacturing Inc Laser, Punching, Bending, Welding, EDM · ISO 9001, AS9100, ITAR | Niwot, CO | LaserPunchingBendingWeldingEDM | ISO 9001, AS9100, ITAR |
| Dynamic Engineering Inc Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding, Finishing | Watertown, SD | MillingTurningLaserWaterjetWeldingEDMGrindingFinishing | - |
| Dynamic Marine Machining Welding | Spring Valley, CA | Welding | - |
| Dynamic Metal Innovations LLC Laser, Bending, Welding, Finishing, Assembly · ITAR | Emmaus, PA | LaserBendingWeldingFinishingAssembly | ITAR |
| Dynamic Sheetmetal Fabrication, LLC Bending, Welding · ISO 9001 | St Paul, MN | BendingWelding | ISO 9001 |
| Dynamix Manufacturing LLC Milling, Turning, Welding | Joplin, MO | MillingTurningWelding | - |
| E & M Machine, Inc Milling, Turning, Welding, EDM, Finishing | Grantsburg, WI | MillingTurningWeldingEDMFinishing | - |
| E-Sector Machining and Fabrication LLC Milling, Turning, Laser, Bending, Welding, EDM, Grinding · ISO 9001 | Sanford, FL | MillingTurningLaserBendingWeldingEDMGrinding | ISO 9001 |
| E.H. Schwab Milling, Turning, Laser, Punching, Bending, Welding · ISO 9001 | Turtle Creek, PA | MillingTurningLaserPunchingBendingWelding | ISO 9001 |