| Edco Engineering Inc Milling, Bending, Welding · ISO 9001, AS9100, NADCAP | Newington, CT | MillingBendingWelding | ISO 9001, AS9100, NADCAP |
| Integra Cast Milling, Turning, Welding, Casting, Finishing, Assembly · ISO 9001, NADCAP | New Britain, CT | MillingTurningWeldingCastingFinishingAssembly | ISO 9001, NADCAP |
| Perry Technology Corporation Milling, Turning, EDM · ISO 9001, AS9100, ITAR, NADCAP | New Hartford, CT | MillingTurningEDM | ISO 9001, AS9100, ITAR, NADCAP |
| Allied Machining Co., Inc Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly | Newington, CT | MillingTurningWeldingEDMGrindingFinishingAssembly | - |
| B & F Machine Co., Inc Milling, Welding, EDM, Grinding · ISO 9001, AS9100 | New Britain, CT | MillingWeldingEDMGrinding | ISO 9001, AS9100 |
| Creed Monarch Milling, Turning, Grinding · ISO 9001 | New Britain, CT | MillingTurningGrinding | ISO 9001 |
| Mega Precision LLC Milling, Turning · ISO 9001, AS9100 | Newington, CT | MillingTurning | ISO 9001, AS9100 |
| Progress, Inc Milling, Turning, Welding, Assembly | Newington, CT | MillingTurningWeldingAssembly | - |
| Richards Machine Tool Co Inc Milling, Turning, Assembly · ISO 9001, AS9100 | Newington, CT | MillingTurningAssembly | ISO 9001, AS9100 |
| LM Gill Welding & Manufacturing LLC Milling, Welding · ISO 9001, AS9100, ITAR, NADCAP | Manchester, CT | MillingWelding | ISO 9001, AS9100, ITAR, NADCAP |
| Phoenix Manufacturing, Inc Milling, Turning, Waterjet, EDM · ISO 9001, AS9100, NADCAP | Enfield, CT | MillingTurningWaterjetEDM | ISO 9001, AS9100, NADCAP |
| Yankee Casting Co, Inc Milling, Welding, Casting · AS9100, NADCAP | Enfield, CT | MillingWeldingCasting | AS9100, NADCAP |
| N.C.T., Inc Milling, Turning, Swiss, Welding, Grinding | Colchester,, CT | MillingTurningSwissWeldingGrinding | - |
| New England CNC, Inc Milling, Finishing | Hamden, CT | MillingFinishing | - |
| Valley Tool and Manufacturing LLC Milling, Turning, Waterjet, Bending, Welding, EDM, Assembly · NADCAP | Milford, CT | MillingTurningWaterjetBendingWeldingEDMAssembly | NADCAP |
| Accu-Tek Engineering, Inc Milling, Turning, Grinding | Plantsville, CT | MillingTurningGrinding | - |
| Allied Precision Components LLC Milling, Turning, Swiss | Wallingford, CT | MillingTurningSwiss | - |
| Alpha Q, Inc Milling, Grinding · ISO 9001, AS9100 | Colchester, CT | MillingGrinding | ISO 9001, AS9100 |
| Apm Machine LLC Milling, Turning | Plainville, CT | MillingTurning | - |
| Atlantic Fabricating Milling, Turning, Punching, Bending, Welding, Assembly · ISO 9001 | East Granby, CT | MillingTurningPunchingBendingWeldingAssembly | ISO 9001 |
| Aurora Advanced Manufacturing LLC Milling, Turning | Rocky Hill, CT | MillingTurning | - |
| B & A Co Inc Milling, Turning · ISO 9001, AS9100 | Milford, CT | MillingTurning | ISO 9001, AS9100 |
| Burke Precision Machine Company, Incorporated Milling, Turning, Grinding · ISO 9001 | East Granby, CT | MillingTurningGrinding | ISO 9001 |
| C.V. Industries Milling, Turning, EDM | Southington, CT | MillingTurningEDM | - |
| Century Tool Co Inc Milling, Turning, Welding, EDM, Grinding | Thompson, CT | MillingTurningWeldingEDMGrinding | - |
| Forge 41 Inc Milling, Bending, Finishing | Central Village, CT | MillingBendingFinishing | - |
| Forster Precision Tool, LLC Milling, Turning, Welding, EDM, Grinding | Seymour, CT | MillingTurningWeldingEDMGrinding | - |
| General Machine Co Inc Milling, Grinding · ISO 9001, AS9100 | Bristol, CT | MillingGrinding | ISO 9001, AS9100 |
| Grace Machine Company, LLC Milling, Turning, EDM, Grinding · ISO 9001 | Berlin, CT | MillingTurningEDMGrinding | ISO 9001 |
| Horst Engineering Milling, Turning · ISO 9001, AS9100 | East Hartford, CT | MillingTurning | ISO 9001, AS9100 |
| JV Precision Machine Co Milling, EDM · ISO 9001, AS9100, ITAR | Seymour, CT | MillingEDM | ISO 9001, AS9100, ITAR |
| K4 Machining LLC Milling, Turning · ISO 9001, AS9100 | Waterbury, CT | MillingTurning | ISO 9001, AS9100 |
| Malux Machine LLC Milling, Turning, Welding, Grinding | Stratford, CT | MillingTurningWeldingGrinding | - |
| Marion Manufacturing Co Inc Milling, Turning, Laser, Stamping, EDM | Cheshire, CT | MillingTurningLaserStampingEDM | - |
| Metal Industries, Inc Milling, Turning, Welding | Hartford, CT | MillingTurningWelding | - |
| Micro Precision, LLC Milling · ISO 9001 | South Windham, CT | Milling | ISO 9001 |
| Petit Tool Company Milling, Turning, Punching, Welding, Stamping, Grinding · ISO 9001, ITAR | Thomaston, CT | MillingTurningPunchingWeldingStampingGrinding | ISO 9001, ITAR |
| Skillcraft Machine Tool Co Inc Milling, Turning, Welding | South Windsor, CT | MillingTurningWelding | - |
| Sound Manufacturing, Inc Milling, Laser, Punching, Bending, Welding, Assembly · ISO 9001 | Old Saybrook, CT | MillingLaserPunchingBendingWeldingAssembly | ISO 9001 |
| Straton Industries Inc Milling, Turning, Stamping, EDM, Grinding, Finishing, Assembly · AS9100, ITAR, CMMC | Stratford, CT | MillingTurningStampingEDMGrindingFinishingAssembly | AS9100, ITAR, CMMC |
| Sunnycor Inc Milling, Turning, Grinding, Assembly · AS9100, ITAR | Torrington, CT | MillingTurningGrindingAssembly | AS9100, ITAR |
| T.P. Engineering Inc Milling, Turning, Swiss, Welding, Grinding, Assembly · ISO 9001, ITAR, ISO 13485 | Danbury, CT | MillingTurningSwissWeldingGrindingAssembly | ISO 9001, ITAR, ISO 13485 |
| Troy Industrial Milling | Ansonia, CT | Milling | - |
| Vangor Engineering Corporation, the Milling, Swiss, Casting · AS9100 | Oxford, CT | MillingSwissCasting | AS9100 |
| W & W Machine Co Inc Milling, Turning, Swiss, Welding, EDM, Finishing | Milford, CT | MillingTurningSwissWeldingEDMFinishing | - |
| Zike Industries LLC Milling, Turning, Laser, Welding, Finishing | Tolland, CT | MillingTurningLaserWeldingFinishing | - |
| A B & F Sheet Metal Products Inc Milling, Turning, Waterjet, Bending, Welding, Finishing · AS9100, ITAR | Cheshire, CT | MillingTurningWaterjetBendingWeldingFinishing | AS9100, ITAR |
| Accu-Rite Tool & Manufacturing Co Inc Milling, Turning · ISO 9001 | Tolland, CT | MillingTurning | ISO 9001 |
| Advanced Machining Technologies L.L.C Milling, Turning · ISO 9001, AS9100 | Plainville, CT | MillingTurning | ISO 9001, AS9100 |
| Bmi Cad Services, Inc Milling, Turning, Welding, EDM, Grinding | Simsbury, CT | MillingTurningWeldingEDMGrinding | - |