| Brinker Machine LLC Milling, Turning, Bending, Welding | Letart, WV | MillingTurningBendingWelding | - |
| Brooks Industrial, LLC Milling, Grinding, Finishing | North Attleboro, MA | MillingGrindingFinishing | - |
| Brost Cleveland LLC Turning, Casting, Finishing, Assembly · ISO 9001 | Cleveland, OH | TurningCastingFinishingAssembly | ISO 9001 |
| Buddy Bar Casting, LLC Milling, Casting | South Gate, CA | MillingCasting | - |
| Cadillac Fabrication Inc Milling, Bending, Welding, Casting · ISO 9001 | Cadillac, MI | MillingBendingWeldingCasting | ISO 9001 |
| Calidad, Inc Casting · ISO 9001, AS9100, ITAR | Ontario, CA | Casting | ISO 9001, AS9100, ITAR |
| Camcraft Inc Milling, Turning, Grinding | Hanover Park, IL | MillingTurningGrinding | - |
| Carley Foundry, Inc Casting · ISO 9001, NADCAP | Minneapolis, MN | Casting | ISO 9001, NADCAP |
| Carollo Metal Works Welding | Chalmette, LA | Welding | - |
| Cast Technologies Inc Casting | Peoria, IL | Casting | - |
| CB Marcellus Metalcasters Inc Casting, Grinding · ISO 9001 | Plainwell, MI | CastingGrinding | ISO 9001 |
| Centracore, LLC Casting · ISO 9001, IATF 16949 | Saint Clair, MI | Casting | ISO 9001, IATF 16949 |
| Century Tool Co Inc Milling, Turning, Welding, EDM, Grinding | Thompson, CT | MillingTurningWeldingEDMGrinding | - |
| Certified Metal Finishing Welding, Casting, Finishing · ISO 9001, AS9100, NADCAP | Pompano Beach, FL | WeldingCastingFinishing | ISO 9001, AS9100, NADCAP |
| Chicago Magnesium Casting Co Welding, Casting · AS9100, NADCAP | Blue Island, IL | WeldingCasting | AS9100, NADCAP |
| Clarksville Foundry Casting | Clarksville, TN | Casting | - |
| Class A Tooling Inc Milling, Turning, Bending, Welding, Stamping, EDM, Grinding | Cabot, AR | MillingTurningBendingWeldingStampingEDMGrinding | - |
| Class Tool & Die Milling, Turning, Casting · ISO 9001 | Mukwonago, WI | MillingTurningCasting | ISO 9001 |
| Clinkenbeard & Associates Inc Milling, Casting, Assembly · AS9100, ITAR | South Beloit, IL | MillingCastingAssembly | AS9100, ITAR |
| CNC Manufacturing Corp Milling, Turning, Swiss · ISO 9001, AS9100 | Long Is City, NY | MillingTurningSwiss | ISO 9001, AS9100 |
| Columbia Machine Works, Inc Milling, Turning, Welding, Stamping, Casting · ISO 9001, ITAR | Columbia, TN | MillingTurningWeldingStampingCasting | ISO 9001, ITAR |
| Columbus Machine Works Milling, Turning, Bending, Welding, EDM, Casting | Columbus, OH | MillingTurningBendingWeldingEDMCasting | - |
| Compucraft Fabricators Inc Milling, Turning, Laser, Punching, Bending, Welding, Grinding, Finishing · ISO 9001, ITAR | Montgomeryville, PA | MillingTurningLaserPunchingBendingWeldingGrindingFinishing | ISO 9001, ITAR |
| Coronado Steel Co Turning, Welding, Casting, Metal AM | Youngstown, OH | TurningWeldingCastingMetal AM | - |
| Courser, Inc Milling, Turning · ISO 9001 | Elmira, NY | MillingTurning | ISO 9001 |
| Coventry Industries LLC Waterjet, Welding, EDM · ITAR | Holly, MI | WaterjetWeldingEDM | ITAR |
| CP Industries Inc Milling, Welding, Casting | Granger, IN | MillingWeldingCasting | - |
| Cross Machine, Inc Assembly | Berlin, NH | Assembly | - |
| CV International, Inc Milling, Turning, Laser, Punching, Bending, Welding · ISO 9001 | Bend, OR | MillingTurningLaserPunchingBendingWelding | ISO 9001 |
| D & D Design & Manufacturing Inc Milling, Turning, Bending, Laser, Welding | Oklahoma City, OK | MillingTurningBendingLaserWelding | - |
| D & G Machine Products, LLC Milling, Turning, Bending, Laser, Welding · ISO 9001, AS9100 | Gorham, ME | MillingTurningBendingLaserWelding | ISO 9001, AS9100 |
| Defelice Engineering, Inc Milling, Turning, Bending, Welding, Casting, Grinding | Mooresville, IN | MillingTurningBendingWeldingCastingGrinding | - |
| Denison Industries, Inc Welding, Casting, Grinding · ISO 9001, AS9100, ITAR, NADCAP | Denison, TX | WeldingCastingGrinding | ISO 9001, AS9100, ITAR, NADCAP |
| Denver Precision Products Turning, Bending | Broomfield, CO | TurningBending | - |
| Design Metal, Inc Milling, Turning, Bending, Welding, Stamping · ISO 9001 | Oak Park, MI | MillingTurningBendingWeldingStamping | ISO 9001 |
| DGF Industrial Innovations Group, Ltd Milling, Turning, Bending, Welding · ISO 9001 | Gilford, NH | MillingTurningBendingWelding | ISO 9001 |
| Dominion Metallurgical Milling, Stamping, Casting, EDM, Grinding, Finishing, Assembly | Roanoke, VA | MillingStampingCastingEDMGrindingFinishingAssembly | - |
| Donsco, Inc Milling, Welding, Casting | Wrightsville, PA | MillingWeldingCasting | - |
| DRM Industries Corp Milling, Turning, Laser, Welding, Casting · ISO 9001 | Lake Delton, WI | MillingTurningLaserWeldingCasting | ISO 9001 |
| Dura Mold, Inc Casting · ISO 9001 | Stevensville, MI | Casting | ISO 9001 |
| Dynamic Machine of Detroit Milling, Turning, Casting, Metal AM | Troy, MI | MillingTurningCastingMetal AM | - |
| Dynamic Machining Inc Milling, Turning | South Salt Lake, UT | MillingTurning | - |
| E2e, Mfg LLC Milling, Casting, EDM | Fremont, CA | MillingCastingEDM | - |
| Eck Fabrication LLC Milling, Turning, Bending, Welding, Grinding | Kingman, KS | MillingTurningBendingWeldingGrinding | - |
| Electronic Sheet Metal Craftsm Milling, Turning, Laser, Punching, Bending, Welding, Grinding, Assembly | Stoughton, MA | MillingTurningLaserPunchingBendingWeldingGrindingAssembly | - |
| Elite Turning & Machining Corp Milling, Turning, EDM, Casting · AS9100 | Rochester, NY | MillingTurningEDMCasting | AS9100 |
| En.Zo Metal Milling, Bending, Laser, Welding, Waterjet | Brooklyn, NY | MillingBendingLaserWeldingWaterjet | - |
| Engineered Tooling Systems, Inc Milling, Laser, Welding, Stamping, Casting, Grinding | Grand Rapids, MI | MillingLaserWeldingStampingCastingGrinding | - |
| Enterprise CNC Machining LLC Milling, Turning, Swiss, Welding, Casting | Mankato, MN | MillingTurningSwissWeldingCasting | - |
| Epic Machine, Inc Milling, Turning, Stamping, Casting, EDM, Grinding, Finishing · ISO 9001 | Fenton, MI | MillingTurningStampingCastingEDMGrindingFinishing | ISO 9001 |