| Colburn Manufacturing Company Milling, Turning · ISO 9001, ISO 13485 | Fridley, MN | MillingTurning | ISO 9001, ISO 13485 |
| Colorado Machine Works, Inc. Milling, Turning | Colorado Springs, CO | MillingTurning | - |
| Contract Machining Milling, Turning, Welding · ISO 9001 | Lexington, KY | MillingTurningWelding | ISO 9001 |
| Conturo Prototyping, LLC Milling, Turning | Pittsburgh, PA | MillingTurning | - |
| CPK Manufacturing Milling, Turning, EDM · ISO 9001 | San Jose, CA | MillingTurningEDM | ISO 9001 |
| Criterion Precision Machining Milling, Turning · ISO 9001, AS9100 | Cleveland, OH | MillingTurning | ISO 9001, AS9100 |
| Crown Fabricators Welding | Las Vegas, NV | Welding | - |
| Crown Machine Inc Milling, Turning, Welding, EDM · ISO 9001 | Rockford, IL | MillingTurningWeldingEDM | ISO 9001 |
| Cut- Out Creations Milling, Turning, Welding | Rochester, NY | MillingTurningWelding | - |
| Cutting Edge Fabrication Inc Milling, Bending, Laser, Welding · ISO 9001 | Milwaukee, WI | MillingBendingLaserWelding | ISO 9001 |
| Cutting Edge Fabrication LLC Welding | Tucson, AZ | Welding | - |
| Cutting Edge Manufacturing Milling, Bending, Welding · ISO 9001, AS9100 | Caldwell, ID | MillingBendingWelding | ISO 9001, AS9100 |
| 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 |
| D&J Technologies Inc. Milling, Turning · ISO 9001, AS9100 | Fort Worth, TX | MillingTurning | ISO 9001, AS9100 |
| DAD Manufacturing, Inc. Bending, Welding · ISO 9001 | Hiawatha, IA | BendingWelding | ISO 9001 |
| Dallas Fabrication Welding | Carrollton, TX | Welding | - |
| Dallas Machine and Tool Milling, Welding | Carrollton, TX | MillingWelding | - |
| Dallas Metal Fabricators Inc. Laser, Welding | Dallas, TX | LaserWelding | - |
| Dallas Precision Machining Milling, Turning, Bending, Laser, Welding, Waterjet, Metal AM · ISO 9001, AS9100, ITAR | Carrollton, TX | MillingTurningBendingLaserWeldingWaterjetMetal AM | ISO 9001, AS9100, ITAR |
| Decotron Welding, Metal AM | Dallas, TX | WeldingMetal AM | - |
| deMel Fabrication Bending, Laser, Welding | Anaheim, CA | BendingLaserWelding | - |
| Denali MetalWorks Bending, Laser, Welding, Waterjet | Phoenix, AZ | BendingLaserWeldingWaterjet | - |
| Denver Machine Shop Milling, Turning, Welding · ISO 9001 | Henderson, CO | MillingTurningWelding | ISO 9001 |
| Denver Precision Products Turning, Bending | Broomfield, CO | TurningBending | - |
| 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 |
| Diamond Machine Works, Inc. Milling, Turning · ISO 9001, AS9100 | Seattle, WA | MillingTurning | ISO 9001, AS9100 |
| Die Craft Milling, Turning, Welding, Waterjet · ISO 9001 | Cincinnati, OH | MillingTurningWeldingWaterjet | ISO 9001 |
| Douglas Machine & Engineering Milling, Turning, Bending, Welding, EDM · ISO 9001, AS9100, ITAR, CMMC | Davenport, IA | MillingTurningBendingWeldingEDM | ISO 9001, AS9100, ITAR, CMMC |
| Dual Machine Milling, Turning, Welding · ISO 9001, AS9100 | Indianapolis, IN | MillingTurningWelding | ISO 9001, AS9100 |
| 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 Machining Inc Milling, Turning | South Salt Lake, UT | MillingTurning | - |
| Eberl Iron Works, Inc. Bending, Welding | Buffalo, NY | BendingWelding | - |
| Elemetal Fabrication and Machine (Formerly American Machine Works) Milling, Bending, Welding, Waterjet | Omaha, NE | MillingBendingWeldingWaterjet | - |
| Elite Tooling Milling, Turning, EDM | Kalamazoo, MI | MillingTurningEDM | - |
| Empire Machine and Fabrication Milling, Turning | Garner, NC | MillingTurning | - |
| Empire Metal Products Turning, Bending, Welding | Phoenix, AZ | TurningBendingWelding | - |
| En.Zo Metal Milling, Bending, Laser, Welding, Waterjet | Brooklyn, NY | MillingBendingLaserWeldingWaterjet | - |
| EnviroTech Milling, Turning, Laser, Welding, EDM | Boise, ID | MillingTurningLaserWeldingEDM | - |
| Etogen Precision Milling, Turning, Welding · ISO 9001, AS9100, ITAR | San Diego, CA | MillingTurningWelding | ISO 9001, AS9100, ITAR |
| Evans Metal Fabricators Inc Milling, Turning, Bending, Laser, Welding | Portland, OR | MillingTurningBendingLaserWelding | - |
| Evansville Sheet Metal Works Bending, Laser, Welding, Waterjet | Evansville, IN | BendingLaserWeldingWaterjet | - |
| Evers Manufacturing Inc Bending, Welding | Milwaukee, WI | BendingWelding | - |
| Ewart-Ohlson Machine Company Milling, Turning, Bending · ISO 9001, AS9100 | Cuyahoga Falls, OH | MillingTurningBending | ISO 9001, AS9100 |
| Exact Machine Service Inc Milling, Turning | York, PA | MillingTurning | - |
| Excel Machining Milling, Turning, Bending, Welding, Waterjet · ISO 9001 | Santa Clara, CA | MillingTurningBendingWeldingWaterjet | ISO 9001 |