| Apex Metal Fabricating & Mach Bending, Laser, Welding | Toledo, OH | BendingLaserWelding | - |
| Aphase II Inc Milling, Turning, Bending, Welding, Stamping, EDM, Grinding | Sterling Heights, MI | MillingTurningBendingWeldingStampingEDMGrinding | - |
| Apogee CNC Inc Milling, Welding, Grinding, Finishing · ITAR | Dexter, MI | MillingWeldingGrindingFinishing | ITAR |
| Apparatus Mfg., Inc Welding, Grinding, Finishing, Assembly | Poughkeepsie, NY | WeldingGrindingFinishingAssembly | - |
| Applied Industrial Machining Milling, Turning, Welding · AS9100 | Oklahoma City, OK | MillingTurningWelding | AS9100 |
| APV Manufacturing Milling, Waterjet, Bending, Welding, Grinding · NADCAP | Buena Park, CA | MillingWaterjetBendingWeldingGrinding | NADCAP |
| ARC Fabricators Bending, Welding | Sioux Falls, SD | BendingWelding | - |
| Arcal Precision Components Inc Milling, Turning, Welding · ISO 9001, AS9100 | Tucson, AZ | MillingTurningWelding | ISO 9001, AS9100 |
| Arek Solutions LLC Welding · ISO 9001 | Stafford, TX | Welding | ISO 9001 |
| Argent Fabrication LLC Bending, Welding | Seattle, WA | BendingWelding | - |
| Ariam Industries LLC Milling, Turning, Welding | Baraga, MI | MillingTurningWelding | - |
| Aristo Industries Laser, Welding · ISO 9001 | Fraser, MI | LaserWelding | ISO 9001 |
| Arizona Metal Craft Bending, Welding | Tucson, AZ | BendingWelding | - |
| 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 |
| Artifact Fabrication LLC Bending, Laser, Welding · ISO 9001, ITAR, CMMC | Rochester, NY | BendingLaserWelding | ISO 9001, ITAR, CMMC |
| Ascend Engineering LLC Milling, Turning, Welding, Grinding, Assembly · ISO 9001 | Largo, FL | MillingTurningWeldingGrindingAssembly | ISO 9001 |
| Ascend Mfg Corp Milling, Laser, Welding, Stamping, Finishing | Anaheim, CA | MillingLaserWeldingStampingFinishing | - |
| Asero Welding | Austin, TX | Welding | - |
| Ash-Tec Laser, Welding, Finishing | Hegins, PA | LaserWeldingFinishing | - |
| Asset Solutions Inc Milling, Turning, Bending, Welding, Assembly · ISO 9001 | Hutto, TX | MillingTurningBendingWeldingAssembly | ISO 9001 |
| Ast Manufacturing Milling, Laser, Punching, Bending, Welding, Assembly · ISO 9001 | Grand Prairie, TX | MillingLaserPunchingBendingWeldingAssembly | ISO 9001 |
| Ataco Steel Products Corp Milling, Laser, Welding, Stamping · ISO 9001 | Cedarburg, WI | MillingLaserWeldingStamping | ISO 9001 |
| Atlantic Metal Products, Inc Waterjet, Bending, Welding | Topping, VA | WaterjetBendingWelding | - |
| Atlantic Pacific Standard Welding | Tucson, AZ | Welding | - |
| Atlas Machine & Supply, Inc. Milling, Turning, Welding, EDM · ISO 9001 | Louisville, KY | MillingTurningWeldingEDM | ISO 9001 |
| Atlas Machine Co. Inc Milling, Turning, Welding · ISO 9001, AS9100 | Baltimore, MD | MillingTurningWelding | ISO 9001, AS9100 |
| Atmosphere Machining LLC Milling, Turning, Waterjet, Welding, Finishing · ITAR | Tehachapi, CA | MillingTurningWaterjetWeldingFinishing | ITAR |
| Atomatic Manufacturing Co Welding, Waterjet | East Pittsburgh, PA | WeldingWaterjet | - |
| Atomic Fabrications LLC. Welding | Seattle, WA | Welding | - |
| Atscott Mfg, Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Grinding, Finishing, Assembly · ISO 9001, ITAR | Pine City, MN | MillingTurningLaserWaterjetPunchingBendingWeldingStampingGrindingFinishingAssembly | ISO 9001, ITAR |
| 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 |
| Axis Fabrication & Machine Co Milling, Turning, Bending, Laser, Welding, EDM · ISO 9001 | Rockford, TN | MillingTurningBendingLaserWeldingEDM | ISO 9001 |
| Az Fine Arc LLC Turning, Waterjet, Bending, Welding, Finishing | Tucson, AZ | TurningWaterjetBendingWeldingFinishing | - |
| Az Manufacturing Engineering, LLC Milling, Turning, Waterjet, Welding | Tucson, AZ | MillingTurningWaterjetWelding | - |
| Azure Microdynamics, Inc Milling, Turning, Swiss, Welding, EDM · ISO 9001, ISO 13485 | Foothill Ranch, CA | MillingTurningSwissWeldingEDM | ISO 9001, ISO 13485 |
| B & B Machine EST. 1948 Milling, Turning, Welding · ISO 9001, ITAR | Denver, CO | MillingTurningWelding | ISO 9001, ITAR |
| B & B Manufacturing Co, Inc Laser, Bending, Welding, Finishing | Forest Hill, MD | LaserBendingWeldingFinishing | - |
| B & C Machine Welding, Waterjet | Oklahoma City, OK | WeldingWaterjet | - |
| B & F Machine Co., Inc Milling, Welding, EDM, Grinding · ISO 9001, AS9100 | New Britain, CT | MillingWeldingEDMGrinding | ISO 9001, AS9100 |
| B & G Tool Co Waterjet, Welding, Stamping, EDM · ISO 9001 | Columbus, OH | WaterjetWeldingStampingEDM | ISO 9001 |
| B Machine Milling, Turning, Welding, Stamping, Grinding | Parkersburg, WV | MillingTurningWeldingStampingGrinding | - |
| B&K Machining LLC Milling, Turning, Welding | Centerville, IA | MillingTurningWelding | - |
| B&L Machine & Fabrication Inc Milling, Turning, Punching, Bending, Welding | Norfolk, VA | MillingTurningPunchingBendingWelding | - |
| Baiar Industries Milling, Turning, Welding, EDM | Columbia Falls, MT | MillingTurningWeldingEDM | - |
| Ballard Marine Fabricators Welding | Seattle, WA | Welding | - |
| Banner Metalcraft Inc Milling, Turning, Laser, Punching, Bending, Welding, Stamping, Grinding, Finishing · AS9100 | Ronkonkoma, NY | MillingTurningLaserPunchingBendingWeldingStampingGrindingFinishing | AS9100 |
| Baum Machine Inc Milling, Turning, Welding | Appleton, WI | MillingTurningWelding | - |
| BDB Fabrication Welding | Aurora, CO | Welding | - |