| Goodwin-Bradley Pattern Co Inc Milling, Casting · ISO 9001, AS9100 | Providence, RI | MillingCasting | ISO 9001, AS9100 |
| Government & Industrial Supply Inc Milling, Turning, Bending, Welding, Finishing | Pulaski, TN | MillingTurningBendingWeldingFinishing | - |
| GP Manufacturing Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001 | Buchanan, MI | MillingTurningWeldingEDMGrindingAssembly | ISO 9001 |
| GR Innovations LLC Laser, Finishing | Lapeer, MI | LaserFinishing | - |
| Graham Research Inc Milling, Swiss, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR, ISO 13485 | Minneapolis, MN | MillingSwissEDMGrindingFinishing | ISO 9001, AS9100, ITAR, ISO 13485 |
| Great Lakes Castings Casting, Grinding · ISO 9001, IATF 16949 | Ludington, MI | CastingGrinding | ISO 9001, IATF 16949 |
| Green Specialty Services, L.L.C Milling, Turning, Laser, Welding, Grinding, Finishing · ISO 9001, AS9100 | Joshua, TX | MillingTurningLaserWeldingGrindingFinishing | ISO 9001, AS9100 |
| Greene Machine & Manufacturing Inc Milling, Turning, Laser, Waterjet, Welding · ISO 9001, AS9100 | Macon, GA | MillingTurningLaserWaterjetWelding | ISO 9001, AS9100 |
| Gromax Precision Die & Mfg., Inc Punching, Bending, Welding, Stamping, EDM, Grinding, Finishing, Assembly · ISO 9001, ITAR | Germantown, WI | PunchingBendingWeldingStampingEDMGrindingFinishingAssembly | ISO 9001, ITAR |
| Gsi International Inc Milling, Turning, Waterjet, Welding, Finishing, Assembly · ISO 9001 | Chandler, AZ | MillingTurningWaterjetWeldingFinishingAssembly | ISO 9001 |
| GST Manufacturing, Ltd Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Finishing, Assembly | Haltom City, TX | TurningLaserWaterjetPunchingBendingWeldingStampingFinishingAssembly | - |
| Gtscientific LLC Milling, Turning, Laser, Welding, Grinding | Honolulu, HI | MillingTurningLaserWeldingGrinding | - |
| H & H Machine Product Milling, Turning | Erie, PA | MillingTurning | - |
| H & H Machine Shop of Akron Inc Milling, Turning, Welding, Grinding | Akron, OH | MillingTurningWeldingGrinding | - |
| Hahn Manufacturing Company Milling, Grinding · ISO 9001 | Cleveland, OH | MillingGrinding | ISO 9001 |
| Halcyon Manufacturing Inc Milling, Turning, Bending, Welding, EDM, Finishing, Assembly · ITAR | San Jose, CA | MillingTurningBendingWeldingEDMFinishingAssembly | ITAR |
| Hallmark Metals Inc Milling, Turning, Laser, Punching, Welding, Stamping, Finishing · ISO 9001, ITAR, NADCAP | Glendora, CA | MillingTurningLaserPunchingWeldingStampingFinishing | ISO 9001, ITAR, NADCAP |
| Hamill Manufacturing Co Milling, Turning, Welding, EDM · ISO 9001, ITAR | Trafford, PA | MillingTurningWeldingEDM | ISO 9001, ITAR |
| Hamilton Machine Co. Milling, Turning, Bending, Welding | Nashville, TN | MillingTurningBendingWelding | - |
| Hammer MetalWerks Bending, Laser, Welding | Indianapolis, IN | BendingLaserWelding | - |
| Hammond Machine Works, Inc Laser, Welding, Grinding, Assembly | Hammond, IN | LaserWeldingGrindingAssembly | - |
| Hand Industries Inc Grinding · ISO 9001, AS9100 | Warsaw, IN | Grinding | ISO 9001, AS9100 |
| Hartman Enterprises Milling, Turning, Swiss, Grinding, Finishing · ISO 9001, AS9100, ITAR | Oneida, NY | MillingTurningSwissGrindingFinishing | ISO 9001, AS9100, ITAR |
| Harvey Brothers Inc Bending, Welding | Cincinnati, OH | BendingWelding | - |
| Hasten Applied CNC LLC Milling, Turning, Swiss, Laser, Bending, Welding, Stamping, EDM, Finishing · ISO 9001, ITAR | Riverside, CA | MillingTurningSwissLaserBendingWeldingStampingEDMFinishing | ISO 9001, ITAR |
| Hastreiter Industries Corp Milling, Turning, Laser, Bending, Welding, Grinding, Finishing · ISO 9001, ITAR | Marshfield, WI | MillingTurningLaserBendingWeldingGrindingFinishing | ISO 9001, ITAR |
| Hexagon Machine & Manufacturing LLC Milling, Assembly · ISO 9001, AS9100 | Longmont, CO | MillingAssembly | ISO 9001, AS9100 |
| Hi Tech Machining & Engineering LLC Milling, Turning, EDM, Grinding | Tucson, AZ | MillingTurningEDMGrinding | - |
| High Star Corp Milling, Turning, Bending, Welding, Stamping, Grinding, Finishing · ISO 9001 | Westland, MI | MillingTurningBendingWeldingStampingGrindingFinishing | ISO 9001 |
| Hill Aerosystems Inc Milling, Turning, Waterjet, Punching, Bending, Welding, Stamping, EDM, Assembly · AS9100 | Enumclaw, WA | MillingTurningWaterjetPunchingBendingWeldingStampingEDMAssembly | AS9100 |
| Hitek Services Inc Turning, Assembly | Owens Cross Roads, AL | TurningAssembly | - |
| HMF Corporation Bending, Laser, Welding | Anaheim, CA | BendingLaserWelding | - |
| Hofacker Precision Machining LLC Milling, Turning, Casting · ISO 9001 | Clayton, OH | MillingTurningCasting | ISO 9001 |
| Holbrook Laser, Welding | Franklin, IN | LaserWelding | - |
| HollyFab Turning, Bending, Laser, Welding, Waterjet | Addison, TX | TurningBendingLaserWeldingWaterjet | - |
| Hood Tooling & Machine LLC Milling, Turning, Welding, EDM, Grinding · ISO 9001 | Malvern, AR | MillingTurningWeldingEDMGrinding | ISO 9001 |
| Horst Engineering Milling, Turning · ISO 9001, AS9100 | East Hartford, CT | MillingTurning | ISO 9001, AS9100 |
| Horst Manufacturing Co Inc Milling, Turning | Windham, OH | MillingTurning | - |
| Howland Machine Corp Milling, Welding | Niles, OH | MillingWelding | - |
| HP Machine & Engineering Inc Milling, Turning, EDM | San Jose, CA | MillingTurningEDM | - |
| HR Machine Turning, Waterjet, EDM | Dayton, OH | TurningWaterjetEDM | - |
| Hunt Design & Manufacturing Inc Milling, Turning, Swiss, EDM, Grinding · AS9100 | Arab, AL | MillingTurningSwissEDMGrinding | AS9100 |
| Hy-Speed Machining, Inc Milling, Turning, EDM | Grants Pass, OR | MillingTurningEDM | - |
| Hydrafab Northwest, Inc Laser, Bending, Welding | Spokane Valley, WA | LaserBendingWelding | - |
| I Auman Machine Co Inc Milling, Turning, Welding | Lebanon, PA | MillingTurningWelding | - |
| Icon Machine Co Milling, Turning, Casting · ISO 9001, AS9100 | Irving, TX | MillingTurningCasting | ISO 9001, AS9100 |
| Imagineering Machine Inc Milling, Turning, Casting · NADCAP | St Louis Park, MN | MillingTurningCasting | NADCAP |
| Img Companies LLC Milling, Turning, Welding, Finishing · ISO 9001, AS9100 | Livermore, CA | MillingTurningWeldingFinishing | ISO 9001, AS9100 |
| Impulse Precision Manufacturing Milling, Stamping, Finishing · ISO 9001, ITAR, NADCAP | Wilsonville, OR | MillingStampingFinishing | ISO 9001, ITAR, NADCAP |
| Imr Inc Turning | Prentice, WI | Turning | - |