| Middletown Industrial Technologies, LLC Milling, Turning, Welding, Stamping, Assembly | Middletown, OH | MillingTurningWeldingStampingAssembly | - |
| Midlake Products & Mfg. Co., Inc Turning, Bending, Laser, Welding, Stamping | Canton, OH | TurningBendingLaserWeldingStamping | - |
| Midway Swiss Turn, Inc Milling, Turning, Swiss, Finishing, Assembly · CMMC | Wooster, OH | MillingTurningSwissFinishingAssembly | CMMC |
| Napoleon Machine LLC Milling, Bending, Welding, Forging, Grinding · ISO 9001, ITAR, CMMC | Napoleon, OH | MillingBendingWeldingForgingGrinding | ISO 9001, ITAR, CMMC |
| Nolte Precise Manufacturing Inc Milling, Turning, Swiss · ISO 9001, AS9100 | Cincinnati, OH | MillingTurningSwiss | ISO 9001, AS9100 |
| Northlake Steel Corp Turning, Forging, Grinding, Finishing | Valley City, OH | TurningForgingGrindingFinishing | - |
| Overlake Manufacturing, Inc Milling, Turning, Swiss | New London, OH | MillingTurningSwiss | - |
| Perfect Precision Machining Ltd Milling, Turning, Welding, EDM | Akron, OH | MillingTurningWeldingEDM | - |
| Plating Technology Inc Stamping, Finishing | Dayton, OH | StampingFinishing | - |
| Premier Manufacturing Group LLC Milling, Waterjet, EDM · ISO 9001 | Miamisburg, OH | MillingWaterjetEDM | ISO 9001 |
| Princeton Tool Inc Milling, Waterjet, Casting, EDM, Grinding, Assembly · AS9100, NADCAP | Mentor, OH | MillingWaterjetCastingEDMGrindingAssembly | AS9100, NADCAP |
| Production Screw Machine Co Milling, Turning, Bending, Welding · ISO 9001, AS9100, ITAR | Dayton, OH | MillingTurningBendingWelding | ISO 9001, AS9100, ITAR |
| Quality Castings Co Casting, Grinding · ISO 9001 | Orrville, OH | CastingGrinding | ISO 9001 |
| Quality CNC Machining Inc Milling, Turning, Swiss · ISO 9001, AS9100, ITAR, ISO 13485 | Willoughby, OH | MillingTurningSwiss | ISO 9001, AS9100, ITAR, ISO 13485 |
| Quality Welding & Fabrication, LLC Bending, Welding | Lima, OH | BendingWelding | - |
| Ravelin Inc Milling, Metal AM · ITAR | Cincinnati, OH | MillingMetal AM | ITAR |
| RMT Corporation Milling, Turning, Welding, Grinding | Dayton, OH | MillingTurningWeldingGrinding | - |
| Rozic Tool & Machine LLC Milling, Turning, EDM · ISO 9001 | Euclid, OH | MillingTurningEDM | ISO 9001 |
| RW Screw, LLC Grinding | Massillon, OH | Grinding | - |
| Solmet Technologies Inc Forging | Canton, OH | Forging | - |
| Srpm Inc Milling, Turning, Assembly · ISO 9001, ITAR | Solon, OH | MillingTurningAssembly | ISO 9001, ITAR |
| Standard Machine, LLC Milling, Turning, Welding, Casting, Grinding, Finishing | Cleveland, OH | MillingTurningWeldingCastingGrindingFinishing | - |
| Summit Machine Solutions Milling, Welding | Akron, OH | MillingWelding | - |
| Summit Machine Solutions LLC Milling, Welding, Grinding | Akron, OH | MillingWeldingGrinding | - |
| Summit Machining Co., Ltd Milling, Turning, Welding, Stamping, Casting, Finishing | Mogadore, OH | MillingTurningWeldingStampingCastingFinishing | - |
| Sunset Industries Inc Milling, Turning, Swiss, Casting, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100, ITAR, CMMC | Mentor, OH | MillingTurningSwissCastingEDMGrindingFinishingAssembly | ISO 9001, AS9100, ITAR, CMMC |
| Swanton Welding & Machining Co Inc Milling, Laser, Bending, Welding, Finishing, Assembly | Swanton, OH | MillingLaserBendingWeldingFinishingAssembly | - |
| Tarman Machine Company, Inc. Welding | Canal Winchester, OH | Welding | - |
| Taylor Manufacturing Co Inc Milling, Turning, Grinding | Springfield, OH | MillingTurningGrinding | - |
| Techmetals, Inc Grinding, Finishing · ISO 9001, AS9100, ITAR, NADCAP, ISO 13485, CMMC | Dayton, OH | GrindingFinishing | ISO 9001, AS9100, ITAR, NADCAP, ISO 13485, CMMC |
| Telcon Inc Welding, Assembly | Streetsboro, OH | WeldingAssembly | - |
| Tessec LLC Milling, Welding, EDM, Grinding, Assembly · AS9100 | Dayton, OH | MillingWeldingEDMGrindingAssembly | AS9100 |
| The Trico Machine Products Corp Milling, Turning, Bending | Cleveland, OH | MillingTurningBending | - |
| The Will-Burt Company Finishing · ISO 9001 | Orrville, OH | Finishing | ISO 9001 |
| Toledo Metal Spinning Company Milling, Bending, Laser, Welding, Stamping · ISO 9001 | Toledo, OH | MillingBendingLaserWeldingStamping | ISO 9001 |
| Tomak Precision Milling, Turning, Swiss, Welding, EDM, Grinding | Lebanon, OH | MillingTurningSwissWeldingEDMGrinding | - |
| Total Manufacturing Milling, Turning, Waterjet, Welding, EDM, Grinding | Mentor, OH | MillingTurningWaterjetWeldingEDMGrinding | - |
| Toth Industries Inc Milling, Turning, Bending, Casting · ISO 9001 | Toledo, OH | MillingTurningBendingCasting | ISO 9001 |
| TRK Fabrication Milling, Turning, Bending, Welding, Waterjet | Akron, OH | MillingTurningBendingWeldingWaterjet | - |
| Trumbull Foundry and Alloy Inc Milling, Casting | Niles, OH | MillingCasting | - |
| United Metal Fabricators Inc Bending, Welding · ISO 9001, ITAR | Cleveland, OH | BendingWelding | ISO 9001, ITAR |
| United Precision Services Milling, Turning, Bending, Welding, Waterjet | Cincinnati, OH | MillingTurningBendingWeldingWaterjet | - |
| Upright Steel Fabricators Bending, Laser, Welding, Waterjet | Cleveland, OH | BendingLaserWeldingWaterjet | - |
| VTD Systems Inc Milling, Turning, Swiss, Welding, EDM, Finishing · ISO 9001, ITAR | Elyria, OH | MillingTurningSwissWeldingEDMFinishing | ISO 9001, ITAR |
| Weldcraft Products Milling, Welding, Grinding | Tipp City, OH | MillingWeldingGrinding | - |
| Westwood Fabrication & Sheet Metal Bending, Laser, Welding | Dayton, OH | BendingLaserWelding | - |
| Wodin Inc Milling, Turning, Bending, Forging | Bedford, OH | MillingTurningBendingForging | - |
| X-Mil, Inc Milling, Turning, Waterjet, Bending, Welding, EDM, Grinding, Finishing · ISO 9001 | Mount Orab, OH | MillingTurningWaterjetBendingWeldingEDMGrindingFinishing | ISO 9001 |