| ALC Engineered Solutions Company Milling, Turning, Swiss, EDM, Finishing · ISO 9001 | Lockwood, MO | MillingTurningSwissEDMFinishing | ISO 9001 |
| Alexander Industries USA LLC Milling, Turning, Welding, Finishing, Assembly | Grand Rapids, MI | MillingTurningWeldingFinishingAssembly | - |
| All Craft Manufacturing Co Milling | Cincinnati, OH | Milling | - |
| All-Around Fabrication Inc Milling, Laser, Bending, Welding · ITAR | Sacramento, CA | MillingLaserBendingWelding | ITAR |
| All-In Machining LLC Milling, Turning | Tracy, CA | MillingTurning | - |
| All-Ways Metal Inc Milling, Turning, Laser, Punching, Bending, Welding, Grinding · ISO 9001, ITAR | Gardena, CA | MillingTurningLaserPunchingBendingWeldingGrinding | ISO 9001, ITAR |
| Allen Co Milling, Turning, Swiss | Minnetonka, MN | MillingTurningSwiss | - |
| Allied Mechanical Milling, Turning, Bending, Welding, EDM, Grinding, Assembly | Ontario, CA | MillingTurningBendingWeldingEDMGrindingAssembly | - |
| Allied Precision Components LLC Milling, Turning, Swiss | Wallingford, CT | MillingTurningSwiss | - |
| Allied Precision, Inc Milling, Turning, Swiss, Welding, Grinding · ISO 9001 | Middletown, DE | MillingTurningSwissWeldingGrinding | ISO 9001 |
| Allis-Roller LLC Milling, Turning, Welding, Grinding, Assembly | Franklin, WI | MillingTurningWeldingGrindingAssembly | - |
| Alloy Metal Products Milling, Turning, EDM, Assembly | Livermore, CA | MillingTurningEDMAssembly | - |
| Alltech Precision Manufacturing Milling, Turning, EDM | Valencia, CA | MillingTurningEDM | - |
| Alm Technologies Milling, Turning, Waterjet, Bending | Yulee, FL | MillingTurningWaterjetBending | - |
| Alpha Foundry Co Milling, Turning, Casting, Finishing | Wright City, MO | MillingTurningCastingFinishing | - |
| Alpha Machining & Manufacturing Milling, Turning · AS9100 | Tulsa, OK | MillingTurning | AS9100 |
| Alpha Precision CNC, LLC Milling, Turning | Fremont, CA | MillingTurning | - |
| Alpine Conglomerate, LLC Milling, Welding · ISO 9001, AS9100, ITAR, NADCAP, CMMC | Bloomer, WI | MillingWelding | ISO 9001, AS9100, ITAR, NADCAP, CMMC |
| Alto Precision, Inc Milling, Turning, Welding, Grinding | Grand Rapids, MI | MillingTurningWeldingGrinding | - |
| Amark Machine Works, LLC Milling, Turning, Welding, Stamping, EDM, Grinding | Gravette, AR | MillingTurningWeldingStampingEDMGrinding | - |
| American Babbitt Bearing Inc Milling, Welding, Casting · ISO 9001 | Huntington, WV | MillingWeldingCasting | ISO 9001 |
| American CNC Fabricating, Inc. Milling, Bending, Laser, Welding, Metal AM | Spokane Valley, WA | MillingBendingLaserWeldingMetal AM | - |
| American Fab Milling, Laser, Bending, Welding | Spring Lake, MI | MillingLaserBendingWelding | - |
| American Hollow Boring Co Milling, Turning, Grinding, Finishing · ISO 9001 | Erie, PA | MillingTurningGrindingFinishing | ISO 9001 |
| American Machine & Gear Inc Milling, Turning, Welding, EDM | Portland, OR | MillingTurningWeldingEDM | - |
| American Machine Tools Co. Milling, Turning, Bending | Chicago, IL | MillingTurningBending | - |
| American Metal Fab Inc Milling, Laser, Punching, Bending, Welding, Stamping · ISO 9001 | Three Rivers, MI | MillingLaserPunchingBendingWeldingStamping | ISO 9001 |
| American Precision Industries, Inc Milling, Turning, Laser, Bending, Welding, Finishing | Hillsboro, OR | MillingTurningLaserBendingWeldingFinishing | - |
| American Products Co Inc Milling, Turning, Bending, EDM · ISO 9001, AS9100 | Union, NJ | MillingTurningBendingEDM | ISO 9001, AS9100 |
| Ameritec Machining, Inc Milling, Turning · ISO 9001 | New Hampton, IA | MillingTurning | ISO 9001 |
| AMS Accurate Metal Milling, Bending, Laser, Welding, Stamping · AS9100 | Richland Hills, TX | MillingBendingLaserWeldingStamping | AS9100 |
| Anaheim Precision Milling, Turning, Bending, Laser, Welding, Waterjet · ISO 9001, AS9100, NADCAP | Orange, CA | MillingTurningBendingLaserWeldingWaterjet | ISO 9001, AS9100, NADCAP |
| Ancon Gear & Instrument Corp Milling, Turning · ISO 9001, AS9100 | Amityville, NY | MillingTurning | ISO 9001, AS9100 |
| Anderson Metal Industries Inc Milling, Turning, Welding, EDM, Grinding, Finishing · ISO 9001, ITAR | Franklin, PA | MillingTurningWeldingEDMGrindingFinishing | ISO 9001, ITAR |
| Ankeny Automation, LLC Milling, Laser, Welding, Grinding, Finishing | Omaha, NE | MillingLaserWeldingGrindingFinishing | - |
| Anthony Machine Milling, Turning, Welding | San Antonio, TX | MillingTurningWelding | - |
| Ap Precision Machine Inc Milling, Turning, Waterjet, Finishing | Holliston, MA | MillingTurningWaterjetFinishing | - |
| Apex Engineered Products Milling, Turning, Waterjet, Welding, Finishing | Clark, PA | MillingTurningWaterjetWeldingFinishing | - |
| Apogee CNC Inc Milling, Welding, Grinding, Finishing · ITAR | Dexter, MI | MillingWeldingGrindingFinishing | ITAR |
| Arc Machine Co Inc Milling, Turning, Welding, Grinding · ISO 9001 | Henderson, KY | MillingTurningWeldingGrinding | ISO 9001 |
| Arcturus Aerospace Milling, Turning · AS9100, ITAR, NADCAP, ISO 9001 | Little Rock, AR | MillingTurning | AS9100, ITAR, NADCAP, ISO 9001 |
| Arnprior Aerospace Portland, Inc Milling · ITAR, NADCAP | Portland, OR | Milling | ITAR, NADCAP |
| Arrowtech Machine Works Milling, Turning, Grinding | Eugene, OR | MillingTurningGrinding | - |
| Asc Machining Milling | Mequon, WI | Milling | - |
| Ascend Engineering LLC Milling, Turning, Welding, Grinding, Assembly · ISO 9001 | Largo, FL | MillingTurningWeldingGrindingAssembly | ISO 9001 |
| Ascentec Engineering LLC Milling, Turning, Waterjet, EDM, Grinding | Tualatin, OR | MillingTurningWaterjetEDMGrinding | - |
| Astoria Wire Products Inc Milling, Laser, Punching, Bending, Welding | Bedford Park, IL | MillingLaserPunchingBendingWelding | - |
| Athena Manufacturing LP Milling, Assembly · ITAR | Austin, TX | MillingAssembly | ITAR |
| Atlantic Fabricating Milling, Turning, Punching, Bending, Welding, Assembly · ISO 9001 | East Granby, CT | MillingTurningPunchingBendingWeldingAssembly | ISO 9001 |
| Atlas Machine & Supply, Inc. Milling, Turning, Welding, EDM · ISO 9001 | Louisville, KY | MillingTurningWeldingEDM | ISO 9001 |