| Hill Aerosystems Inc Milling, Turning, Waterjet, Punching, Bending, Welding, Stamping, EDM, Assembly · AS9100 | Enumclaw, WA | MillingTurningWaterjetPunchingBendingWeldingStampingEDMAssembly | AS9100 |
| Hillco Contracting LLC Milling, Turning, Welding, Grinding | Bates City, MO | MillingTurningWeldingGrinding | - |
| Hillside Engineering, Inc Milling, Turning, Grinding, Assembly | Danvers, MA | MillingTurningGrindingAssembly | - |
| Hilltop Technology Laboratory Inc Milling | Irvine, CA | Milling | - |
| Phillips Precision Machining, LLC Milling, Turning | Bartlesville, OK | MillingTurning | - |
| Primary Flow Signal Inc Milling, Turning, Welding, EDM · ITAR | Cranston, RI | MillingTurningWeldingEDM | ITAR |
| The Charles Schillinger Co., Inc Turning, Welding, Stamping · ISO 9001 | Bensalem, PA | TurningWeldingStamping | ISO 9001 |
| Liberty Hill Company Milling, Turning, Swiss, Laser, Waterjet, Bending, EDM · ISO 9001, AS9100, ITAR | Huntington, WV | MillingTurningSwissLaserWaterjetBendingEDM | ISO 9001, AS9100, ITAR |
| Phillips Precision Milling, Turning · ISO 9001 | Boylston, MA | MillingTurning | ISO 9001 |
| American Precision Industries, Inc Milling, Turning, Laser, Bending, Welding, Finishing | Hillsboro, OR | MillingTurningLaserBendingWeldingFinishing | - |
| Braun Co. Engineering LLC Milling, Turning, Swiss, Grinding | Signal Hill, CA | MillingTurningSwissGrinding | - |
| Davis Tool Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP | Hillsboro, OR | MillingTurningLaserWaterjetPunchingBendingWeldingEDMGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP |
| Dexter Design & Development Co Milling, Turning, EDM, Grinding, Assembly · ISO 9001 | Hillsboro, OR | MillingTurningEDMGrindingAssembly | ISO 9001 |
| Esco Precision Inc Milling, Turning, Bending, Stamping, Forging, EDM, Finishing, Assembly · ISO 9001 | Hillsborough, NJ | MillingTurningBendingStampingForgingEDMFinishingAssembly | ISO 9001 |
| Fluets Corp Milling, Turning · ISO 9001, NADCAP | Hillside, NJ | MillingTurning | ISO 9001, NADCAP |
| Highline Tool Inc Milling, Turning, Swiss, Grinding | Hillsboro, OR | MillingTurningSwissGrinding | - |
| JC Custom Machining & Design Inc Milling, Turning, Welding, Grinding | Hillsboro, OR | MillingTurningWeldingGrinding | - |
| R & R Manufacturing Milling, Turning, Welding, Waterjet | Hillsboro, OR | MillingTurningWeldingWaterjet | - |
| Windmill Hill Manufacturing, LLC Milling, Turning, Waterjet, Welding, Grinding | Tully, NY | MillingTurningWaterjetWeldingGrinding | - |
| Tough Cut Manufacturing Milling, Turning · AS9100 | Anaheim, CA | MillingTurning | AS9100 |
| Advanced Machining Inc Milling, Turning, Waterjet, Welding | New Smyrna Beach, FL | MillingTurningWaterjetWelding | - |
| Aurora Advanced Manufacturing LLC Milling, Turning | Rocky Hill, CT | MillingTurning | - |
| Azure Microdynamics, Inc Milling, Turning, Swiss, Welding, EDM · ISO 9001, ISO 13485 | Foothill Ranch, CA | MillingTurningSwissWeldingEDM | ISO 9001, ISO 13485 |
| Valley Iron Welding | Fresno, CA | Welding | - |