| Atlas Machine & Supply, Inc. Milling, Turning, Welding, EDM · ISO 9001 | Louisville, KY | MillingTurningWeldingEDM | ISO 9001 |
| 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 |
| 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 |
| Avalon Mfg, Inc Milling · AS9100 | Compton, CA | Milling | AS9100 |
| Avans Machine, Inc Milling, Turning, Welding, EDM, Grinding · ISO 9001, AS9100, ISO 13485 | Scottsboro, AL | MillingTurningWeldingEDMGrinding | ISO 9001, AS9100, ISO 13485 |
| Azure Microdynamics, Inc Milling, Turning, Swiss, Welding, EDM · ISO 9001, ISO 13485 | Foothill Ranch, CA | MillingTurningSwissWeldingEDM | ISO 9001, ISO 13485 |
| B & A Co Inc Milling, Turning · ISO 9001, AS9100 | Milford, CT | MillingTurning | ISO 9001, AS9100 |
| B & D Precision Welding Milling, Turning, Welding, Grinding | Pomona, CA | MillingTurningWeldingGrinding | - |
| B & G Tool Co Waterjet, Welding, Stamping, EDM · ISO 9001 | Columbus, OH | WaterjetWeldingStampingEDM | ISO 9001 |
| B & J Specialty Inc Milling, Welding, EDM | Wawaka, IN | MillingWeldingEDM | - |
| B & W Machine Works, Inc Milling, Turning, Swiss, Grinding, Finishing · AS9100, NADCAP | Perkasie, PA | MillingTurningSwissGrindingFinishing | AS9100, NADCAP |
| Baker Engineering, LLC Milling, Turning, Welding · ISO 9001, AS9100 | Nunica, MI | MillingTurningWelding | ISO 9001, AS9100 |
| 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 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 |
| BCL Manufacturing Inc Laser, Punching, Welding | Windber, PA | LaserPunchingWelding | - |
| Bell Machine Works Milling, Finishing · ISO 9001, ITAR | Gilroy, CA | MillingFinishing | ISO 9001, ITAR |
| Beltim & Associates, LLC Milling, Turning, Swiss, Waterjet, Stamping, Casting, EDM, Finishing · ISO 9001, ITAR, ISO 13485 | Pleasanton, CA | MillingTurningSwissWaterjetStampingCastingEDMFinishing | ISO 9001, ITAR, ISO 13485 |
| Ben Parker Company Bending, Laser, Welding, Waterjet | Chattanooga, TN | BendingLaserWeldingWaterjet | - |
| Bent River Tech Milling, Turning, EDM, Grinding | Vancouver, WA | MillingTurningEDMGrinding | - |
| Benton Machine Works Inc. Milling, Turning | Jacksonville, FL | MillingTurning | - |
| 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 | - |
| Bishop Aviation Inc Milling, Turning, Bending, EDM · ISO 9001, AS9100, ITAR | Hot Springs National Park, AR | MillingTurningBendingEDM | ISO 9001, AS9100, ITAR |
| Bitec Milling, Turning, Swiss, Waterjet, EDM, Grinding | Dayton, OH | MillingTurningSwissWaterjetEDMGrinding | - |
| BK Aerospace Milling, Turning, Waterjet, Welding, EDM · ISO 9001, AS9100, CMMC | Arab, AL | MillingTurningWaterjetWeldingEDM | ISO 9001, AS9100, CMMC |
| Blackhawk Engineering LLC Milling, Turning · ISO 9001, ITAR | Cedar Falls, IA | MillingTurning | ISO 9001, ITAR |
| Blackstar CNC LLC Milling, Laser, Bending, Welding, Finishing · ISO 9001 | Merrillville, IN | MillingLaserBendingWeldingFinishing | ISO 9001 |
| Bland Brothers Enterprises Milling, Welding, Assembly | Springfield, IL | MillingWeldingAssembly | - |
| Boise Metal Works Welding, Waterjet | Boise, ID | WeldingWaterjet | - |
| Bollinger Atelier Milling, Waterjet, Welding, Casting | Tempe, AZ | MillingWaterjetWeldingCasting | - |
| Borg Design Inc Milling, Turning · ISO 9001, AS9100, ITAR, CMMC | Hudson, MA | MillingTurning | ISO 9001, AS9100, ITAR, CMMC |
| Bowden Manufacturing Corp Milling, Turning, EDM · AS9100 | Willoughby, OH | MillingTurningEDM | AS9100 |
| Bozeman CNC LLC Milling, Laser, Finishing · ISO 9001, AS9100, ITAR | Manhattan, MT | MillingLaserFinishing | ISO 9001, AS9100, ITAR |
| Brennan Machine Co., Inc Milling · ISO 9001 | Hanson, MA | Milling | ISO 9001 |
| Bridan Mfg Inc Milling, Turning, EDM · ISO 9001 | Kenosha, WI | MillingTurningEDM | ISO 9001 |
| Bridesburg Foundry Company Casting | Whitehall, PA | Casting | - |
| Bristol Manufacturing LLC Milling, Turning, EDM · ITAR | Sealy, TX | MillingTurningEDM | ITAR |
| Britech Electropolishing Inc Welding, Finishing | Newark, CA | WeldingFinishing | - |
| Broadway Metal Works Inc Milling, Turning, Laser, Waterjet, Bending, Welding | Broadway, VA | MillingTurningLaserWaterjetBendingWelding | - |
| Brodeur Machine Company, Inc Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding | New Bedford, MA | MillingTurningLaserWaterjetWeldingEDMGrinding | - |
| Bront Machining Inc. Milling, Turning, Welding · ISO 9001, AS9100 | Dayton, OH | MillingTurningWelding | ISO 9001, AS9100 |
| Brown Precision Inc Milling, Turning, Bending, Welding, Waterjet, EDM · ISO 9001, AS9100 | Huntsville, AL | MillingTurningBendingWeldingWaterjetEDM | ISO 9001, AS9100 |
| Bru Tek LLC Milling, Turning, Laser, Welding | Shelby Township, MI | MillingTurningLaserWelding | - |
| BS Designs Inc Milling, Turning, Welding | Santee, CA | MillingTurningWelding | - |