| Micro Machine & Electronics, Inc Milling, Turning, Welding, Grinding, Finishing, Assembly · ITAR | Leominster, MA | MillingTurningWeldingGrindingFinishingAssembly | ITAR |
| Northeast Manufacturing Milling, Turning, Assembly · ISO 9001 | Stoneham, MA | MillingTurningAssembly | ISO 9001 |
| Phillips Precision Milling, Turning · ISO 9001 | Boylston, MA | MillingTurning | ISO 9001 |
| Precision Machinists Company Inc Milling, Turning, Swiss, Finishing, Assembly · ISO 9001, ISO 13485 | Chelmsford, MA | MillingTurningSwissFinishingAssembly | ISO 9001, ISO 13485 |
| Ramco Machine LLC Milling, Turning, EDM | Rowley, MA | MillingTurningEDM | - |
| Rock Valley Tool, LLC Milling, Turning, Grinding · ISO 9001, AS9100, ITAR | Easthampton, MA | MillingTurningGrinding | ISO 9001, AS9100, ITAR |
| S&H Engineering, Inc Milling · ITAR | Chelmsford, MA | Milling | ITAR |
| Semco Machine Corporation Milling, Turning | Plainville, MA | MillingTurning | - |
| Teltron Engineering, Inc Laser, Punching, Bending, Welding, Assembly · AS9100, ITAR, CMMC | Taunton, MA | LaserPunchingBendingWeldingAssembly | AS9100, ITAR, CMMC |
| Trilap Precision Finishing, LLC Grinding · ITAR | Lowell, MA | Grinding | ITAR |