| Marquee Machining & Engineering LLC Milling | Leesburg, IN | Milling | - |
| Melting Point Metalworks LLC Laser, Bending, Welding | Brownsburg, IN | LaserBendingWelding | - |
| Mercer Machine Company, Inc Milling, Turning, EDM · AS9100 | Camby, IN | MillingTurningEDM | AS9100 |
| Mofab Inc Milling, Laser, Waterjet, Bending, Welding | Anderson, IN | MillingLaserWaterjetBendingWelding | - |
| Morehead Machinery Inc Milling, Turning, Welding, EDM, Grinding | Elkhart, IN | MillingTurningWeldingEDMGrinding | - |
| Rapid Prototyping & Engineering, Inc Milling, Turning, Waterjet, Welding, EDM, Assembly | Franklin, IN | MillingTurningWaterjetWeldingEDMAssembly | - |
| RPM Tool Waterjet, Stamping | Princeton, IN | WaterjetStamping | - |
| South Bend Form Tool Co Milling, Turning, EDM | South Bend, IN | MillingTurningEDM | - |
| Specialty Tool & Die Company Inc Milling, Turning, Bending, Welding, Stamping, Grinding, Assembly | Kokomo, IN | MillingTurningBendingWeldingStampingGrindingAssembly | - |
| Standard Locknut, LLC Milling, Turning | Westfield, IN | MillingTurning | - |
| Statt Engineering LLC Milling, Stamping · AS9100, ITAR | Martinsville, IN | MillingStamping | AS9100, ITAR |
| Steel House Bending, Welding | Indianapolis, IN | BendingWelding | - |
| Sunspot Solutions LLC Welding | Lyons, IN | Welding | - |
| Toolcraft LLC Milling | Fort Wayne, IN | Milling | - |
| Touchdown Machining Inc Milling, Turning | Columbus, IN | MillingTurning | - |
| Triad Fabricators, LLC Milling, Turning, Bending | Evansville, IN | MillingTurningBending | - |
| Turn & Burn Machine, LLC Milling, Welding | Sunman, IN | MillingWelding | - |
| Wirecut Technologies, Inc Milling, Turning, EDM, Grinding | Indianapolis, IN | MillingTurningEDMGrinding | - |
| Yankee Steel Inc Turning, Welding, Finishing | Terre Haute, IN | TurningWeldingFinishing | - |