| Hi Tech Machining & Engineering LLC Milling, Turning, EDM, Grinding | Tucson, AZ | MillingTurningEDMGrinding | - |
| High Performance Engineering Milling, Turning, Bending, EDM | Sioux Falls, SD | MillingTurningBendingEDM | - |
| High Tech Machine II Co Limited Milling, Turning, Welding, EDM | Houston, TX | MillingTurningWeldingEDM | - |
| Hiler Industries Milling, Turning, Casting, EDM · ISO 9001 | La Porte, IN | MillingTurningCastingEDM | ISO 9001 |
| HP Machine & Engineering Inc Milling, Turning, EDM | San Jose, CA | MillingTurningEDM | - |
| Hy-Speed Machining, Inc Milling, Turning, EDM | Grants Pass, OR | MillingTurningEDM | - |
| Idp TM Inc Milling, Turning, EDM · ISO 9001 | Rockwall, TX | MillingTurningEDM | ISO 9001 |
| Infinity EDM, LLC Milling, Turning, EDM, Grinding · ISO 9001 | Jackson, WI | MillingTurningEDMGrinding | ISO 9001 |
| Insulfab Plastics Inc Stamping, EDM · ITAR | Franklin, NH | StampingEDM | ITAR |
| Iq Manufacturing LLC Milling, Stamping, EDM, Grinding · ISO 9001 | Auburn Hills, MI | MillingStampingEDMGrinding | ISO 9001 |
| J.V. Manufacturing Co Inc Stamping, EDM, Grinding · ISO 9001 | Natrona Heights, PA | StampingEDMGrinding | ISO 9001 |
| J&J Machine Milling, EDM | Appleton, WI | MillingEDM | - |
| Jaco Engineering Milling, Turning, Bending, Welding, EDM, Grinding, Finishing, Assembly · NADCAP | Anaheim, CA | MillingTurningBendingWeldingEDMGrindingFinishingAssembly | NADCAP |
| Jarvis Manufacturing, Inc Milling, Turning, EDM, Assembly · ISO 9001, ITAR | San Jose, CA | MillingTurningEDMAssembly | ISO 9001, ITAR |
| JC Tool & Die, LLC Milling, Turning, Stamping, EDM, Grinding, Assembly · ISO 9001, ITAR | Hull, GA | MillingTurningStampingEDMGrindingAssembly | ISO 9001, ITAR |
| Jeb Modern Machines, Limited Turning, EDM | Republic, OH | TurningEDM | - |
| Jennison Corp Turning, Laser, EDM | Carnegie, PA | TurningLaserEDM | - |
| JMS Machine, Inc Milling, Turning, EDM, Grinding | Columbia City, IN | MillingTurningEDMGrinding | - |
| Jonaco Machine Inc Milling, Turning, Swiss, EDM, Grinding · ISO 9001 | Chaska, MN | MillingTurningSwissEDMGrinding | ISO 9001 |
| JV Precision Machine Co Milling, EDM · ISO 9001, AS9100, ITAR | Seymour, CT | MillingEDM | ISO 9001, AS9100, ITAR |
| K & K Precision, Inc Milling, Turning, EDM, Grinding | Mason, OH | MillingTurningEDMGrinding | - |
| Kam Tool & Die Milling, Turning, EDM, Grinding · ISO 9001 | Zebulon, NC | MillingTurningEDMGrinding | ISO 9001 |
| Kent Machine Milling, EDM, Grinding | Indianapolis, IN | MillingEDMGrinding | - |
| Ketchie-Houston, Inc Milling, Turning, EDM, Grinding · ISO 9001, AS9100 | Concord, NC | MillingTurningEDMGrinding | ISO 9001, AS9100 |
| Keystone Machine & Fab, Inc Milling, Turning, EDM, Grinding | Grafton, OH | MillingTurningEDMGrinding | - |
| Kinetic Engine Systems Milling, EDM, Grinding | Phoenix, AZ | MillingEDMGrinding | - |
| Krukemeier Machine Milling, Turning, EDM · AS9100, NADCAP | Indianapolis, IN | MillingTurningEDM | AS9100, NADCAP |
| L. C. S. Co Laser, Welding, Stamping, EDM · ISO 9001, AS9100, ITAR, NADCAP | Saint Paul, MN | LaserWeldingStampingEDM | ISO 9001, AS9100, ITAR, NADCAP |
| L&B Labs Milling, Turning, Laser, Welding, EDM, Grinding | San Jose, CA | MillingTurningLaserWeldingEDMGrinding | - |
| La Gauge Co Milling, Turning, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR | Sun Valley, CA | MillingTurningEDMGrindingFinishing | ISO 9001, AS9100, ITAR |
| Lad Engineering LLC Milling, Turning, EDM · ISO 9001, AS9100 | Albuquerque, NM | MillingTurningEDM | ISO 9001, AS9100 |
| Lean Manufacturing Group LLC Milling, Turning, EDM · AS9100, ITAR | Valencia, CA | MillingTurningEDM | AS9100, ITAR |
| Lektron Inc Milling, EDM, Assembly | Hartselle, AL | MillingEDMAssembly | - |
| Lenson Machine Inc Milling, Turning, Stamping, EDM · ISO 9001 | Middle River, MD | MillingTurningStampingEDM | ISO 9001 |
| Liberty Precision Company Milling, Turning, EDM, Grinding, Assembly · ISO 9001 | Houston, TX | MillingTurningEDMGrindingAssembly | ISO 9001 |
| Lomar Machine & Tool Co Milling, Turning, Laser, Bending, Welding, Casting, EDM, Grinding, Finishing · ISO 9001 | Horton, MI | MillingTurningLaserBendingWeldingCastingEDMGrindingFinishing | ISO 9001 |
| Loughmiller Machine, Tool & Design Milling, Turning, Waterjet, Welding, EDM, Finishing | Loogootee, IN | MillingTurningWaterjetWeldingEDMFinishing | - |
| M & J Manufacturing, Inc. Milling, Turning, EDM | Portland, OR | MillingTurningEDM | - |
| M & L Precision Machining, Inc EDM | Morgan Hill, CA | EDM | - |
| M-Tech Machining LLC Milling, Turning, EDM · ITAR | Edgewood, NM | MillingTurningEDM | ITAR |
| Machine Shop LLC EDM, Assembly | East Hardwick, VT | EDMAssembly | - |
| Machine Tool Technology LLC Milling, EDM | South Chesterfield, VA | MillingEDM | - |
| Machinist Lab Milling, EDM | San Diego, CA | MillingEDM | - |
| Manda Machine Co Milling, Turning, Laser, Welding, Waterjet, EDM · ISO 9001, AS9100 | Dallas, TX | MillingTurningLaserWeldingWaterjetEDM | ISO 9001, AS9100 |
| Marion Manufacturing Co Inc Milling, Turning, Laser, Stamping, EDM | Cheshire, CT | MillingTurningLaserStampingEDM | - |
| Marton Precision MF Milling, Turning, Waterjet, Welding, EDM, Finishing · ISO 9001, AS9100, ITAR | Fullerton, CA | MillingTurningWaterjetWeldingEDMFinishing | ISO 9001, AS9100, ITAR |
| Maumee Pattern Co Milling, Turning, Casting, EDM · ITAR, CMMC | Toledo, OH | MillingTurningCastingEDM | ITAR, CMMC |
| MBK Machine Corp Milling, Turning, Laser, EDM, Grinding · ITAR | Mead, CO | MillingTurningLaserEDMGrinding | ITAR |
| McKenzie Machining Inc Milling, Turning, EDM, Grinding · ISO 9001, AS9100, ITAR | San Jose, CA | MillingTurningEDMGrinding | ISO 9001, AS9100, ITAR |
| McQuillen Manufacturing LLC Milling, EDM · ISO 9001, AS9100, ITAR | Honeoye Falls, NY | MillingEDM | ISO 9001, AS9100, ITAR |