| Alpha Omega Machining Inc Milling, Turning, Welding, EDM, Finishing · ISO 9001 | Painesville, OH | MillingTurningWeldingEDMFinishing | ISO 9001 |
| Alpha Precision CNC, LLC Milling, Turning | Fremont, CA | MillingTurning | - |
| Alto Precision, Inc Milling, Turning, Welding, Grinding | Grand Rapids, MI | MillingTurningWeldingGrinding | - |
| Alziebler Incorporated Milling, Turning, Welding, Grinding, Finishing · ISO 9001, AS9100, ITAR, NADCAP | Arleta, CA | MillingTurningWeldingGrindingFinishing | ISO 9001, AS9100, ITAR, NADCAP |
| Amark Machine Works, LLC Milling, Turning, Welding, Stamping, EDM, Grinding | Gravette, AR | MillingTurningWeldingStampingEDMGrinding | - |
| Ameri-Cut Solutions Inc Milling, Turning | Porter, TX | MillingTurning | - |
| American CNC Inc Milling, Turning · AS9100 | Pacoima, CA | MillingTurning | AS9100 |
| American Custom Screws Turning, Swiss | Bohemia, NY | TurningSwiss | - |
| American Machine & Gear Inc Milling, Turning, Welding, EDM | Portland, OR | MillingTurningWeldingEDM | - |
| American Machining Solutions Inc Milling, Turning, Swiss, EDM, Grinding · ISO 9001, AS9100 | Willow Spring, NC | MillingTurningSwissEDMGrinding | ISO 9001, AS9100 |
| American Shop Tools LLC Milling, Turning | Conroe, TX | MillingTurning | - |
| American Swiss Products Turning, Swiss · ISO 9001 | Pittsford, NY | TurningSwiss | ISO 9001 |
| American Turned Products Inc Turning, EDM, Grinding | Fairview, PA | TurningEDMGrinding | - |
| Ameritec Machining, Inc Milling, Turning · ISO 9001 | New Hampton, IA | MillingTurning | ISO 9001 |
| Amg Engineering & Machining Milling, Turning, Bending, Welding, EDM · ISO 9001, AS9100, ITAR, IATF 16949 | Indianapolis, IN | MillingTurningBendingWeldingEDM | ISO 9001, AS9100, ITAR, IATF 16949 |
| Amherst Stainless Fabrication, LLC Turning, Welding, Waterjet | Buffalo, NY | TurningWeldingWaterjet | - |
| Ami Machining Inc Milling, Turning, Waterjet, EDM, Grinding | Hayden, ID | MillingTurningWaterjetEDMGrinding | - |
| Ansco Machine Co Milling, Turning, Punching, Grinding, Finishing · ISO 9001, ITAR | Peninsula, OH | MillingTurningPunchingGrindingFinishing | ISO 9001, ITAR |
| Anthony Machine Milling, Turning, Welding | San Antonio, TX | MillingTurningWelding | - |
| Ap Precision Machine Inc Milling, Turning, Waterjet, Finishing | Holliston, MA | MillingTurningWaterjetFinishing | - |
| Apex Precision CNC Milling, Turning, Punching, Bending, Stamping, Casting, EDM, Grinding, Assembly · ITAR, CMMC | Orem, UT | MillingTurningPunchingBendingStampingCastingEDMGrindingAssembly | ITAR, CMMC |
| Apm Machine LLC Milling, Turning | Plainville, CT | MillingTurning | - |
| Applied Industrial Machining Milling, Turning, Welding · AS9100 | Oklahoma City, OK | MillingTurningWelding | AS9100 |
| Applied Metals & Machine Works, Inc. Milling, Turning, Welding | Fort Wayne, IN | MillingTurningWelding | - |
| Arcturus Aerospace Milling, Turning · AS9100, ITAR, NADCAP, ISO 9001 | Little Rock, AR | MillingTurning | AS9100, ITAR, NADCAP, ISO 9001 |
| Aria Dynamics LLC Milling, Turning · ITAR | Far Hills, NJ | MillingTurning | ITAR |
| Ariam Industries LLC Milling, Turning, Welding | Baraga, MI | MillingTurningWelding | - |
| Arkay Solutions Milling, Turning, Welding, Assembly | Feasterville Trevose, PA | MillingTurningWeldingAssembly | - |
| Armorit, LLC Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001, ITAR | Sarasota, FL | MillingTurningWeldingEDMGrindingAssembly | ISO 9001, ITAR |
| Art CNC Machining LLC Milling, Turning, Assembly · ISO 9001 | Bridgeview, IL | MillingTurningAssembly | ISO 9001 |
| Ascentec Engineering LLC Milling, Turning, Waterjet, EDM, Grinding | Tualatin, OR | MillingTurningWaterjetEDMGrinding | - |
| Ashore Manufacturing Group LLC Milling, Turning, Stamping, EDM, Grinding · ISO 9001, AS9100, ITAR, CMMC | Berlin Center, OH | MillingTurningStampingEDMGrinding | ISO 9001, AS9100, ITAR, CMMC |
| Asko Processing Inc Turning, Grinding, Finishing | Seattle, WA | TurningGrindingFinishing | - |
| Asset Solutions Inc Milling, Turning, Bending, Welding, Assembly · ISO 9001 | Hutto, TX | MillingTurningBendingWeldingAssembly | ISO 9001 |
| Astley Precision Machine Co Milling, Turning · ISO 9001, ITAR | Irwin, PA | MillingTurning | ISO 9001, ITAR |
| Astro Aircom LLC Milling, Turning, Welding, Grinding, Finishing · ISO 9001, AS9100, ITAR | Bloomfield, CT | MillingTurningWeldingGrindingFinishing | ISO 9001, AS9100, ITAR |
| Astro Machine Works Milling, Turning, Welding, Assembly · ISO 9001, CMMC | Ephrata, PA | MillingTurningWeldingAssembly | ISO 9001, CMMC |
| Atam LLC Milling, Turning · ISO 9001 | Santa Ana, CA | MillingTurning | ISO 9001 |
| Atd Precision Manufacturing LLC Milling, Turning, Laser, Bending, Welding, Stamping, EDM | Phoenix, AZ | MillingTurningLaserBendingWeldingStampingEDM | - |
| Atlantic Fabricating Milling, Turning, Punching, Bending, Welding, Assembly · ISO 9001 | East Granby, CT | MillingTurningPunchingBendingWeldingAssembly | ISO 9001 |
| Aurele M Gatti Inc Milling, Turning, Waterjet | Fairless Hills, PA | MillingTurningWaterjet | - |
| Aurora Advanced Manufacturing LLC Milling, Turning | Rocky Hill, CT | MillingTurning | - |
| Austin Dynamics, Inc. Milling, Turning · ISO 9001, AS9100, ITAR | Cedar Park, TX | MillingTurning | ISO 9001, AS9100, ITAR |
| Austin Machine Co Milling, Turning, Waterjet · ISO 9001 | O Fallon, MO | MillingTurningWaterjet | ISO 9001 |
| Automated Machine & Technology Inc Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Assembly · ISO 9001, ITAR | Yorktown, VA | MillingTurningWaterjetBendingWeldingEDMGrindingAssembly | ISO 9001, ITAR |
| Avans Machine, Inc Milling, Turning, Welding, EDM, Grinding · ISO 9001, AS9100, ISO 13485 | Scottsboro, AL | MillingTurningWeldingEDMGrinding | ISO 9001, AS9100, ISO 13485 |
| 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 |
| Axxis Corp Milling, Turning, Swiss, Laser · ISO 9001, AS9100, ITAR, ISO 13485 | Perris, CA | MillingTurningSwissLaser | ISO 9001, AS9100, ITAR, ISO 13485 |
| Az Fine Arc LLC Turning, Waterjet, Bending, Welding, Finishing | Tucson, AZ | TurningWaterjetBendingWeldingFinishing | - |