| Borg Design Inc. | Hudson | MA | Subcontractor |
| Boulevard Machine & Gear, Inc. | Westfield | MA | Subcontractor |
| Bracalente Manufacturing Co. Inc. | Trumbauersville | PA | Subcontractor |
| Brek Manufacturing Co. | Gardena | CA | Subcontractor |
| Brenk Brothers Inc. | Minneapolis | MN | Subcontractor |
| Briggs Machine & Fabrication, L.L.C. | Spokane Valley | WA | Subcontractor |
| Brinksway Tool Limited | Manchester | | Subcontractor |
| B & R Machine Inc. | Ludlow | MA | Subcontractor |
| Brown Precision, Inc. | Huntsville | AL | Subcontractor |
| Bryant Machine Co. Inc. | Jacksonville | AL | Subcontractor |
| Bryan Tool & Machining Inc. | Broadway | VA | $0 |
| Bryant's Precision, M F G, Corp. | Vero Beach | FL | Subcontractor |
| B-tec Solutions Inc. | Croydon | PA | Subcontractor |
| Bt Machine Inc. | Tulsa | OK | Subcontractor |
| Budde Precision Machining Corp. | Dayton | OH | Subcontractor |
| Bullet Fabrication LLC | Gardena | CA | Subcontractor |
| Burdge Manufacturing Group LLC | Caldwell | ID | Subcontractor |
| Burger & Brown Engineering, Incorporated | Grandview | MO | Subcontractor |
| Burns Precision Turning, Inc. | Safety Harbor | FL | Subcontractor |
| Butler Machine, LLC | Excelsior Springs | MO | Subcontractor |
| C.a. Jones, Inc. | Newport News | VA | Subcontractor |
| Calmax Technology, Inc. | Santa Clara | CA | Subcontractor |
| C & A Machining Inc. | Simi Valley | CA | Subcontractor |
| Cambridge Valley Machining Inc. | Cambridge | NY | Subcontractor |
| Camco Manufacturing Inc. | Sayre | PA | Subcontractor |
| Camtron, Incorporated | Plano | TX | Subcontractor |
| Canadian Babbitt Bearings Ltd. | Brantford | ON | Subcontractor |
| Can-am Manufacturing Inc. | Santa Clarita | CA | Subcontractor |
| Carbon Consultants LLC | Bingen | WA | Subcontractor |
| Cardic Machine Products, Inc. | Carson | CA | Subcontractor |
| Cardinal Machine Co. | Strongsville | OH | $0 |
| Carich Enterprises, Inc. | Santa Ana | CA | Subcontractor |
| Carlisle Machine Works Inc. | Millville | NJ | $0 |
| Carlson Tool & Manufacturing Corp. | Cedarburg | WI | Subcontractor |
| Carmin Industries, Inc. | Jacksonville | AL | Subcontractor |
| Carver Machine Works, Inc. | Washington | NC | Subcontractor |
| Casemer Tool & Machine Inc. | Oxford | MI | Subcontractor |
| Cassavant Machining, LLC | Phoenix | AZ | Subcontractor |
| Cassmac LLC | Phoenix | AZ | Subcontractor |
| C & A Tool Engineering Inc. | Churubusco | IN | Subcontractor |
| Cb Manufacturing & Engineering Inc. | Santa Ana | CA | Subcontractor |
| CBM Fabrications, Inc. | Ballston Lake | NY | Subcontractor |
| C & C Machine Inc. | La Crosse | WI | $0 |
| C & C Machine, Inc. | Tyngsboro | MA | $0 |
| CCT Enterprises, LLC | Auburn | IN | Subcontractor |
| Centerline Machine, LLC | Waupaca | WI | Subcontractor |
| Center Machine Inc. | Center | ND | $0 |
| Centra Industries Inc. | Cambridge | ON | Subcontractor |
| Century, LLC | Traverse City | MI | $0 |
| Century Precision Engineering, Inc. | Gardena | CA | Subcontractor |
| Century Tool Co. Inc. | Thompson | CT | Subcontractor |
| Century Tool, Inc. | Rogers | MN | Subcontractor |
| Cer-mac Inc. | Telford | PA | Subcontractor |
| Ces Machine Products Inc. | Reno | NV | Subcontractor |
| C & F Tool & Die Co. LLC | San Antonio | TX | Subcontractor |
| Challenge Tool & Manufacturing Inc. | New Haven | IN | Subcontractor |
| Chandler Industries, Inc. | Minneapolis | MN | Subcontractor |
| Charles Meisner, Inc. | Upland | CA | Subcontractor |
| Chesaning MFG. Co. Inc. | Chesaning | MI | $0 |
| Cheyenne MFG., Inc. | Wichita | KS | Subcontractor |
| Christopher Tool & MFG. Co. | Solon | OH | Subcontractor |
| Chuck George Inc. | Wilmington | DE | Subcontractor |
| Class A Tooling, Inc. | Cabot | AR | Subcontractor |
| Classic Engineering, LLC | Gloucester | MA | $0 |
| Classic Machine, Inc. | Ashland | VA | $0 |
| Clayens US LLC | Atlanta | GA | Subcontractor |
| Clinkenbeard & Associates Inc. | South Beloit | IL | Subcontractor |
| Clint Precision Manufacturing, Inc. | San Diego | CA | Subcontractor |
| C. Machine Co. Inc. | Minneapolis | MN | Subcontractor |
| C&M Machine Products, Inc. | Hudson | NH | Subcontractor |
| C M Tool, LLC | Palm City | FL | Subcontractor |
| CNC Industries, LLC | Fort Wayne | IN | Subcontractor |
| CNC Manufacturing Corp. | Long Is City | NY | $0 |
| CNC Specialties Manufacturing Inc. | Apollo | PA | Subcontractor |
| C & N Machining | Canoga Park | CA | $0 |
| C & N Manufacturing, Inc. | Fraser | MI | Subcontractor |
| Coast Aerospace Manufacturing, Inc. | Placentia | CA | Subcontractor |
| Coast Precision Enterprises, Inc. | San Diego | CA | Subcontractor |
| Colbrit Manufacturing Company, Inc. | Chatsworth | CA | Subcontractor |
| Coldon Engineering Co. Limited | Basildon | | Subcontractor |
| Coleman Machine, Inc. | Owens Cross Roads | AL | Subcontractor |
| Collins Custom Manufacturing LLC | Fort Worth | TX | Subcontractor |
| Collins Manufacturing, Inc. | Essex | MA | Subcontractor |
| Collins MFG., Inc. | Apopka | FL | Subcontractor |
| Columbia Asc Inc. | Lawrence | MA | Subcontractor |
| Columbia Machine Works, Inc. | Columbia | TN | Subcontractor |
| Columbia Precision Machine Corp. | Saint Paul | MN | Subcontractor |
| Command Technology, Inc. | Baltimore | MD | Subcontractor |
| Commercial Machine, Inc. | Ludlow | MA | $0 |
| Commercial Metal Fabricators, Inc. | Dayton | OH | Subcontractor |
| Commonwealth Machining LLC | Richmond | VA | Subcontractor |
| Competitive Engineering, Inc. | Tucson | AZ | Subcontractor |
| Competitive Machining Inc. | Standish | MI | Subcontractor |
| Composite Cutter Technology Inc. | Wauconda | IL | $0 |
| Compucraft Industries, Inc. | Santee | CA | Subcontractor |
| Computer Assisted Manufacturing Technology LLC | Irvine | CA | Subcontractor |
| Computer Integrated Machining, Inc. | Santee | CA | Subcontractor |
| Conley Manufacturing Inc. | Shelby Township | MI | $0 |
| Consolidated Hinge & Manufactured Products Inc. | Campbell | CA | Subcontractor |
| Continental Machining Co. | Albuquerque | NM | Subcontractor |
