| Atlas Tool & Die Works Inc Turning, Laser, Waterjet, Welding, Stamping, EDM, Assembly | Lyons, IL | TurningLaserWaterjetWeldingStampingEDMAssembly | - |
| Atomic Machine & EDM Inc Milling, Turning, Swiss, EDM, Finishing · ISO 9001, ITAR, ISO 13485 | Naples, FL | MillingTurningSwissEDMFinishing | ISO 9001, ITAR, ISO 13485 |
| Atscott Mfg, Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Grinding, Finishing, Assembly · ISO 9001, ITAR | Pine City, MN | MillingTurningLaserWaterjetPunchingBendingWeldingStampingGrindingFinishingAssembly | ISO 9001, ITAR |
| Aurora Advanced Manufacturing LLC Milling, Turning | Rocky Hill, CT | MillingTurning | - |
| Auto-Turn Acquisition, LLC Milling, Turning, Welding, Stamping, Grinding, Finishing · ISO 9001, AS9100 | Tulsa, OK | MillingTurningWeldingStampingGrindingFinishing | ISO 9001, AS9100 |
| Automated Machine & Technology Inc Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Assembly · ISO 9001, ITAR | Yorktown, VA | MillingTurningWaterjetBendingWeldingEDMGrindingAssembly | ISO 9001, ITAR |
| Automated Production Machining, Inc Milling, Turning, Welding, Grinding | Gordonsville, VA | MillingTurningWeldingGrinding | - |
| Autopilot Inc Milling, Turning, Finishing | Bozeman, MT | MillingTurningFinishing | - |
| Avanti Engineering Inc Milling, Turning, Swiss, EDM, Grinding, Finishing, Assembly · ISO 9001 | Glendale Heights, IL | MillingTurningSwissEDMGrindingFinishingAssembly | ISO 9001 |
| Avvid Corporation Milling, Turning, Swiss, Grinding · ISO 13485 | Laramie, WY | MillingTurningSwissGrinding | ISO 13485 |
| Axion Labs Inc Milling, Turning, Finishing · ISO 9001, AS9100, ITAR, ISO 13485 | Westlake, OH | MillingTurningFinishing | ISO 9001, AS9100, ITAR, ISO 13485 |
| Axton Robotics LLC Milling, Turning, Finishing | San Diego, CA | MillingTurningFinishing | - |
| Az Fine Arc LLC Turning, Waterjet, Bending, Welding, Finishing | Tucson, AZ | TurningWaterjetBendingWeldingFinishing | - |
| B & A Co Inc Milling, Turning · ISO 9001, AS9100 | Milford, CT | MillingTurning | ISO 9001, AS9100 |
| B & F Modern Manufacturing, Inc Milling, Turning, Assembly | Santa Ana, CA | MillingTurningAssembly | - |
| B & H Toolworks Inc Milling, Turning, Laser, Bending, Welding, Stamping, EDM, Finishing · ISO 9001 | Richmond, KY | MillingTurningLaserBendingWeldingStampingEDMFinishing | ISO 9001 |
| B & W Machine Works, Inc Milling, Turning, Swiss, Grinding, Finishing · AS9100, NADCAP | Perkasie, PA | MillingTurningSwissGrindingFinishing | AS9100, NADCAP |
| B & Z Manufacturing Co Inc Milling, Turning, Grinding · ISO 9001 | San Jose, CA | MillingTurningGrinding | ISO 9001 |
| B Machine Milling, Turning, Welding, Stamping, Grinding | Parkersburg, WV | MillingTurningWeldingStampingGrinding | - |
| Baiar Industries Milling, Turning, Welding, EDM | Columbia Falls, MT | MillingTurningWeldingEDM | - |
| Barnes Welding Inc Turning, Bending, Welding | Waterville, WA | TurningBendingWelding | - |
| Basin Precision Machining LLC Milling, Turning, Grinding · ISO 9001 | Jefferson, WI | MillingTurningGrinding | ISO 9001 |
| Baum Machine Inc Milling, Turning, Welding | Appleton, WI | MillingTurningWelding | - |
| Baum Precision Machining Inc Milling, Turning, Assembly · ISO 9001, AS9100, ITAR | Pipersville, PA | MillingTurningAssembly | ISO 9001, AS9100, ITAR |
| Bauman Machine Inc Milling, Turning, Laser, Welding · ISO 9001 | Oklahoma City, OK | MillingTurningLaserWelding | ISO 9001 |
| Beatrice Machine, LLC Milling, Turning, Welding | Beatrice, NE | MillingTurningWelding | - |
| Bedford Machine & Tool Inc Milling, Turning, Welding, Casting, Finishing | Bedford, IN | MillingTurningWeldingCastingFinishing | - |
| Beistel Machining, Inc Milling, Turning · ISO 9001 | Donora, PA | MillingTurning | ISO 9001 |
| Belfanti Machine Works LLC Milling, Turning, Waterjet, Welding, Stamping | Beaverton, OR | MillingTurningWaterjetWeldingStamping | - |
| Bellwether Inc Milling, Turning, Waterjet, EDM, Grinding · ISO 9001 | Mcdonough, GA | MillingTurningWaterjetEDMGrinding | ISO 9001 |
| Beloit Precision, Inc Milling, Turning, Stamping · ISO 9001 | Beloit, WI | MillingTurningStamping | ISO 9001 |
| Beltim & Associates, LLC Milling, Turning, Swiss, Waterjet, Stamping, Casting, EDM, Finishing · ISO 9001, ITAR, ISO 13485 | Pleasanton, CA | MillingTurningSwissWaterjetStampingCastingEDMFinishing | ISO 9001, ITAR, ISO 13485 |
| Bender Precision Machining Incorporated Milling, Turning | Keyport, NJ | MillingTurning | - |
| Benen Manufacturing LLC Milling, Turning, Welding, Finishing, Assembly · ISO 9001, ISO 13485 | San Jose, CA | MillingTurningWeldingFinishingAssembly | ISO 9001, ISO 13485 |
| Benson Machine Works Inc. Turning, Bending, Laser, Welding | Omaha, NE | TurningBendingLaserWelding | - |
| Beonca Machine Inc Milling, Turning · ISO 9001, AS9100, ITAR | La Verne, CA | MillingTurning | ISO 9001, AS9100, ITAR |
| Bertrand Products, Inc Milling, Turning, Grinding, Finishing · ISO 9001 | South Bend, IN | MillingTurningGrindingFinishing | ISO 9001 |
| Billet Industries Inc Milling, Turning, Laser, Welding, EDM, Grinding, Assembly · AS9100 | York, PA | MillingTurningLaserWeldingEDMGrindingAssembly | AS9100 |
| Bishop Aerospace LLC Milling, Turning, Swiss, Finishing | Aledo, TX | MillingTurningSwissFinishing | - |
| BK Aerospace Milling, Turning, Waterjet, Welding, EDM · ISO 9001, AS9100, CMMC | Arab, AL | MillingTurningWaterjetWeldingEDM | ISO 9001, AS9100, CMMC |
| Blackburn's Fabrication Milling, Turning, Bending, Laser, Welding | Columbus, OH | MillingTurningBendingLaserWelding | - |
| Blackhawk Engineering LLC Milling, Turning · ISO 9001, ITAR | Cedar Falls, IA | MillingTurning | ISO 9001, ITAR |
| Blackhawk Machine Products Inc Milling, Turning | Smithfield, RI | MillingTurning | - |
| Blackstone Advanced Technologies Milling, Turning, Laser, Punching, Bending, Welding, Finishing, Assembly · ISO 9001 | Jamestown, NY | MillingTurningLaserPunchingBendingWeldingFinishingAssembly | ISO 9001 |
| Bluewater Industries Inc Milling, Turning, Welding, Casting, Finishing | Moses Lake, WA | MillingTurningWeldingCastingFinishing | - |
| BMC Global Manufacturing LLC Turning, Laser, Bending, Welding, Assembly · ISO 9001 | Pasadena, TX | TurningLaserBendingWeldingAssembly | ISO 9001 |
| Bmi Cad Services, Inc Milling, Turning, Welding, EDM, Grinding | Simsbury, CT | MillingTurningWeldingEDMGrinding | - |
| Bob Lewis Machine Company, Inc Milling, Turning, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100 | Gardena, CA | MillingTurningWeldingEDMGrindingFinishing | ISO 9001, AS9100 |
| Bothe Associates Inc Milling, Turning, Swiss, Stamping · ISO 9001 | Kenosha, WI | MillingTurningSwissStamping | ISO 9001 |
| Bowden Manufacturing Corp Milling, Turning, EDM · AS9100 | Willoughby, OH | MillingTurningEDM | AS9100 |