| 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 | - |
| Blackstone Advanced Technologies Milling, Turning, Laser, Punching, Bending, Welding, Finishing, Assembly · ISO 9001 | Jamestown, NY | MillingTurningLaserPunchingBendingWeldingFinishingAssembly | ISO 9001 |
| Blake Machine Milling, Turning, Welding | Phoenix, AZ | MillingTurningWelding | - |
| Bmi Cad Services, Inc Milling, Turning, Welding, EDM, Grinding | Simsbury, CT | MillingTurningWeldingEDMGrinding | - |
| Bogue Machine Co Inc Milling, Turning, Bending, Welding, Waterjet, EDM · ISO 9001, AS9100, ITAR | Albuquerque, NM | MillingTurningBendingWeldingWaterjetEDM | ISO 9001, AS9100, ITAR |
| Boniface Tool & Die Inc Milling, Turning, Waterjet, Stamping, Grinding, Finishing | Dudley, MA | MillingTurningWaterjetStampingGrindingFinishing | - |
| Bonneville Machine Milling, Turning, Welding · ISO 9001 | Salt Lake City, UT | MillingTurningWelding | ISO 9001 |
| Bothe Associates Inc Milling, Turning, Swiss, Stamping · ISO 9001 | Kenosha, WI | MillingTurningSwissStamping | ISO 9001 |
| Boyce Machine Milling, Turning, Welding | Kent, OH | MillingTurningWelding | - |
| Boyer Machine & Tool Co Inc Milling, Turning, Swiss, EDM · ITAR | Columbus, IN | MillingTurningSwissEDM | ITAR |
| Bradhart Products, Inc Milling, Turning, Finishing · ISO 9001, ITAR | Brighton, MI | MillingTurningFinishing | ISO 9001, ITAR |
| Braun Co. Engineering LLC Milling, Turning, Swiss, Grinding | Signal Hill, CA | MillingTurningSwissGrinding | - |
| Brinker Machine LLC Milling, Turning, Bending, Welding | Letart, WV | MillingTurningBendingWelding | - |
| Britt Tool Inc Milling, Turning, Waterjet | Brazil, IN | MillingTurningWaterjet | - |
| 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 |
| Brost Cleveland LLC Turning, Casting, Finishing, Assembly · ISO 9001 | Cleveland, OH | TurningCastingFinishingAssembly | ISO 9001 |
| Bru Tek LLC Milling, Turning, Laser, Welding | Shelby Township, MI | MillingTurningLaserWelding | - |
| BS Designs Inc Milling, Turning, Welding | Santee, CA | MillingTurningWelding | - |
| BT Machine Inc Milling, Turning, Welding, Finishing · ISO 9001, AS9100, ITAR | Tulsa, OK | MillingTurningWeldingFinishing | ISO 9001, AS9100, ITAR |
| Buckingham Tool Corp Milling, Turning, Welding, Grinding | Livonia, MI | MillingTurningWeldingGrinding | - |
| Budde Precision Machining Corp Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 | Dayton, OH | MillingTurningWeldingEDMGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 |
| Bula Forge & Machine Inc Milling, Turning, Welding, Forging, Assembly · ISO 9001 | Cleveland, OH | MillingTurningWeldingForgingAssembly | ISO 9001 |
| Burgess Specialty Fabricating Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, EDM, Grinding, Finishing | Houston, TX | MillingTurningLaserWaterjetPunchingBendingWeldingEDMGrindingFinishing | - |
| Burns Machine Co Milling, Turning, Bending, Welding, Grinding, Assembly · ISO 9001 | Ottawa, IL | MillingTurningBendingWeldingGrindingAssembly | ISO 9001 |
| Busch Brothers Milling, Turning, Swiss, Finishing | New Prague, MN | MillingTurningSwissFinishing | - |
| Butler Precision Technologies LLC Milling, Turning, Welding, Finishing · AS9100, ITAR | Bristol, PA | MillingTurningWeldingFinishing | AS9100, ITAR |
| C & C Machine Inc Milling, Turning, Bending, Welding | La Crosse, WI | MillingTurningBendingWelding | - |
| C & F Tool & Die Milling, Turning, Welding · ISO 9001, AS9100, ITAR | San Antonio, TX | MillingTurningWelding | ISO 9001, AS9100, ITAR |
| C & S Machine & Manufacturing Corp Milling, Turning, Laser, Bending, Welding · ISO 9001, AS9100 | Louisville, KY | MillingTurningLaserBendingWelding | ISO 9001, AS9100 |
| C & S Machine Products Inc Milling, Turning, Swiss, EDM, Grinding · AS9100, NADCAP, ISO 13485 | Niles, MI | MillingTurningSwissEDMGrinding | AS9100, NADCAP, ISO 13485 |
| C & T Industrial Machine Shop, Inc Milling, Turning, Waterjet, Welding | Byron, GA | MillingTurningWaterjetWelding | - |
| C&C Fabrication Co Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Grinding, Finishing, Assembly | Laceys Spring, AL | MillingTurningLaserWaterjetPunchingBendingWeldingGrindingFinishingAssembly | - |
| C&M Precision Tech Milling, Turning, Swiss, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR, ISO 13485, CMMC | Hudson, NH | MillingTurningSwissWeldingEDMGrindingFinishing | ISO 9001, AS9100, ITAR, ISO 13485, CMMC |
| Cal Machine & Manufacturing LLC Milling, Turning, Welding, Assembly · ISO 9001, AS9100 | Chino, CA | MillingTurningWeldingAssembly | ISO 9001, AS9100 |
| Calrod Engineering, LLC Milling, Turning, Welding · ISO 9001, AS9100, ITAR | Costa Mesa, CA | MillingTurningWelding | ISO 9001, AS9100, ITAR |
| Caran Precision Engineering & Manufacturing Corp Milling, Turning, Swiss, Welding, Stamping, EDM, Grinding, Assembly · ISO 9001, IATF 16949 | Brea, CA | MillingTurningSwissWeldingStampingEDMGrindingAssembly | ISO 9001, IATF 16949 |
| Cascade Precision Inc Milling, Turning, Finishing · ISO 9001, AS9100, ITAR | Boring, OR | MillingTurningFinishing | ISO 9001, AS9100, ITAR |
| Casco Machining Inc. Milling, Turning, Welding · ISO 9001 | San Jose, CA | MillingTurningWelding | ISO 9001 |
| Casemer Tool & Machine Inc Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding | Oxford, MI | MillingTurningLaserWaterjetWeldingEDMGrinding | - |
| Cassavant Machining, LLC Milling, Turning, Swiss, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100 | Phoenix, AZ | MillingTurningSwissWeldingEDMGrindingFinishing | ISO 9001, AS9100 |
| CBM Fabrication Inc Milling, Turning, Waterjet, Welding, EDM, Grinding, Finishing | Ballston Lake, NY | MillingTurningWaterjetWeldingEDMGrindingFinishing | - |
| CCT Enterprises, LLC Milling, Turning, Swiss, Stamping, EDM, Assembly · ISO 9001, AS9100, ITAR, IATF 16949, CMMC | Auburn, IN | MillingTurningSwissStampingEDMAssembly | ISO 9001, AS9100, ITAR, IATF 16949, CMMC |
| Center Machine Inc Milling, Turning, Bending, Welding | Center, ND | MillingTurningBendingWelding | - |
| Center Tool Co Milling, Turning, Welding, Stamping, EDM, Grinding · ISO 9001 | Hampshire, IL | MillingTurningWeldingStampingEDMGrinding | ISO 9001 |
| Centerline Engineered Solutions, Inc Milling, Turning, Laser, Bending, Welding · ISO 9001 | Greenwood, SC | MillingTurningLaserBendingWelding | ISO 9001 |
| Central Valley Machine Inc Milling, Turning, Waterjet, Bending, Welding, EDM · AS9100, ITAR | Logan, UT | MillingTurningWaterjetBendingWeldingEDM | AS9100, ITAR |
| Century Metal Spinning Co Milling, Turning, Laser, Bending, Welding, Finishing · ISO 9001, AS9100, ITAR | Bensenville, IL | MillingTurningLaserBendingWeldingFinishing | ISO 9001, AS9100, ITAR |
| Century Tool Co Inc Milling, Turning, Welding, EDM, Grinding | Thompson, CT | MillingTurningWeldingEDMGrinding | - |