| Davlan Engineering Inc Milling, Turning, Laser, Welding, Stamping | Saint Louis, MO | MillingTurningLaserWeldingStamping | - |
| DGF Industrial Innovations Group, Ltd Milling, Turning, Bending, Welding · ISO 9001 | Gilford, NH | MillingTurningBendingWelding | ISO 9001 |
| Dgworks Mfg. LLC Turning, Swiss · ISO 9001, AS9100, ITAR | Estacada, OR | TurningSwiss | ISO 9001, AS9100, ITAR |
| Diamond W Custom Machine Works LLC Milling, Turning, Laser, Waterjet, Welding, Finishing | Phillipsburg, KS | MillingTurningLaserWaterjetWeldingFinishing | - |
| Die Technology, Inc Milling, Turning, Swiss, Bending, Stamping, EDM, Grinding · ISO 9001, CMMC | Saint Michael, MN | MillingTurningSwissBendingStampingEDMGrinding | ISO 9001, CMMC |
| Dieform LLC Turning, Punching, Bending, Grinding · ISO 9001, NADCAP | Jurupa Valley, CA | TurningPunchingBendingGrinding | ISO 9001, NADCAP |
| Digital Machining Systems LLC Milling, Turning, Welding, Assembly · ISO 9001 | Duson, LA | MillingTurningWeldingAssembly | ISO 9001 |
| Dinucci Corp Milling, Turning · AS9100 | Concord, CA | MillingTurning | AS9100 |
| DJW Assembly Inc Milling, Turning | Arlington Heights, IL | MillingTurning | - |
| DK Machining LLC Milling, Turning, Welding, Assembly · ISO 9001, ITAR | Molalla, OR | MillingTurningWeldingAssembly | ISO 9001, ITAR |
| DM Machine and Tool LLC Turning, Finishing · ISO 9001, ITAR | Ridgeway, SC | TurningFinishing | ISO 9001, ITAR |
| Dms-South/bailey Tool LLC Milling, Turning, Welding, Stamping, EDM | Lancaster, TX | MillingTurningWeldingStampingEDM | - |
| Douglas Machine & Engineering Milling, Turning, Bending, Welding, EDM · ISO 9001, AS9100, ITAR, CMMC | Davenport, IA | MillingTurningBendingWeldingEDM | ISO 9001, AS9100, ITAR, CMMC |
| DP Machining Inc Milling, Turning, Swiss, Stamping, Finishing | La Verne, CA | MillingTurningSwissStampingFinishing | - |
| DP Products, Inc Milling, Turning, EDM · ISO 9001 | San Jose, CA | MillingTurningEDM | ISO 9001 |
| Dpi Inc Milling, Turning | Hatboro, PA | MillingTurning | - |
| Draeving Machine Tool, Inc Milling, Turning, Welding, EDM | Beloit, WI | MillingTurningWeldingEDM | - |
| DRM Industries Corp Milling, Turning, Laser, Welding, Casting · ISO 9001 | Lake Delton, WI | MillingTurningLaserWeldingCasting | ISO 9001 |
| DRP Machine Milling, Turning, Grinding · ISO 9001 | West Valley City, UT | MillingTurningGrinding | ISO 9001 |
| DT Precision, LLC Milling, Turning, Swiss · ISO 9001, AS9100, ITAR, ISO 13485 | San Jose, CA | MillingTurningSwiss | ISO 9001, AS9100, ITAR, ISO 13485 |
| Dual Machine Milling, Turning, Welding · ISO 9001, AS9100 | Indianapolis, IN | MillingTurningWelding | ISO 9001, AS9100 |
| Dunham Products, Inc Milling, Turning, Swiss, Grinding, Finishing · ISO 9001 | Walton Hills, OH | MillingTurningSwissGrindingFinishing | ISO 9001 |
| Duo Tec Tool Co Milling, Turning, Stamping, EDM, Grinding | Maple Grove, MN | MillingTurningStampingEDMGrinding | - |
| 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 Balance Machine Milling, Turning · ISO 9001, AS9100, ITAR | Salt Lake City, UT | MillingTurning | ISO 9001, AS9100, ITAR |
| Dynamic Loop Inc Milling, Turning, Laser, Waterjet, Finishing | Camarillo, CA | MillingTurningLaserWaterjetFinishing | - |
| Dynamic Machining Inc Milling, Turning | South Salt Lake, UT | MillingTurning | - |
| Dynamix Manufacturing LLC Milling, Turning, Welding | Joplin, MO | MillingTurningWelding | - |
| E. J. Basler Co Milling, Turning, Swiss, Grinding · ISO 9001 | Schiller Park, IL | MillingTurningSwissGrinding | ISO 9001 |
| E.H. Schwab Milling, Turning, Laser, Punching, Bending, Welding · ISO 9001 | Turtle Creek, PA | MillingTurningLaserPunchingBendingWelding | ISO 9001 |
| E.j. Reynolds Company Turning, Laser, Waterjet, Welding | Alvin, TX | TurningLaserWaterjetWelding | - |
| E&M Machine Milling, Turning | Seminole, FL | MillingTurning | - |
| Eagle Quality Components LLC Milling, Turning, Welding, Grinding, Finishing, Assembly | Tavares, FL | MillingTurningWeldingGrindingFinishingAssembly | - |
| Eagle Valley Industries, LLC Turning, Waterjet, Bending, Welding | Penn Valley, CA | TurningWaterjetBendingWelding | - |
| Eas Manufacturing Co Milling, Turning, Welding, EDM, Grinding | Camarillo, CA | MillingTurningWeldingEDMGrinding | - |
| East Bay Manufacturers Inc Milling, Turning, Laser, Welding, Finishing, Assembly | Bristol, RI | MillingTurningLaserWeldingFinishingAssembly | - |
| Eastern Panhandle Machine Milling, Turning, Welding, Grinding | Burlington, WV | MillingTurningWeldingGrinding | - |
| Eck Fabrication LLC Milling, Turning, Bending, Welding, Grinding | Kingman, KS | MillingTurningBendingWeldingGrinding | - |
| Eckert Enterprises Ltd Milling, Turning, EDM, Grinding | Tempe, AZ | MillingTurningEDMGrinding | - |
| Ecutec LLC Turning, EDM | Clover, SC | TurningEDM | - |
| Eds Precision Manufacturing LLC Milling, Turning, Swiss, Metal AM, EDM · ISO 9001, ITAR | Houston, TX | MillingTurningSwissMetal AMEDM | ISO 9001, ITAR |
| Elco Machine Company Milling, Turning, Finishing | San Luis Obispo, CA | MillingTurningFinishing | - |
| Electro Erosion Specialties, Inc Milling, Turning, Laser, Welding, EDM, Grinding | Renton, WA | MillingTurningLaserWeldingEDMGrinding | - |
| Electro Parts Inc Milling, Turning, Welding, EDM, Finishing, Assembly | West Berlin, NJ | MillingTurningWeldingEDMFinishingAssembly | - |
| Element Machine Milling, Turning · ISO 9001, AS9100 | Anaheim, CA | MillingTurning | ISO 9001, AS9100 |
| Elite Machine, Inc Milling, Turning | Manchester, NY | MillingTurning | - |
| Elite Turning & Machining Corp Milling, Turning, EDM, Casting · AS9100 | Rochester, NY | MillingTurningEDMCasting | AS9100 |
| Ella Engineering Incorporated Milling, Turning, Finishing | Elk Grove Village, IL | MillingTurningFinishing | - |
| Elmco Two, Inc Milling, Turning, Punching, Bending, Welding | Camden, NJ | MillingTurningPunchingBendingWelding | - |