| Advanced Precision Machining, LLC Milling, Turning, Laser, Waterjet, EDM, Assembly · AS9100, ITAR, CMMC | Costa Mesa, CA | MillingTurningLaserWaterjetEDMAssembly | AS9100, ITAR, CMMC |
| Aeg Industries, Inc Milling, Turning, Bending, Grinding · ISO 9001, ITAR | Santa Rosa, CA | MillingTurningBendingGrinding | ISO 9001, ITAR |
| All Time Machine Inc Milling, Turning, Finishing · AS9100 | Ontario, CA | MillingTurningFinishing | AS9100 |
| Alpha Machinery & Technology Co, Inc Milling, Bending, Welding · ISO 9001, AS9100 | Los Angeles, CA | MillingBendingWelding | ISO 9001, AS9100 |
| Alziebler Incorporated Milling, Turning, Welding, Grinding, Finishing · ISO 9001, AS9100, ITAR, NADCAP | Arleta, CA | MillingTurningWeldingGrindingFinishing | ISO 9001, AS9100, ITAR, NADCAP |
| Atmosphere Machining LLC Milling, Turning, Waterjet, Welding, Finishing · ITAR | Tehachapi, CA | MillingTurningWaterjetWeldingFinishing | ITAR |
| Axxis Corp Milling, Turning, Swiss, Laser · ISO 9001, AS9100, ITAR, ISO 13485 | Perris, CA | MillingTurningSwissLaser | ISO 9001, AS9100, ITAR, ISO 13485 |
| Bob Lewis Machine Company, Inc Milling, Turning, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100 | Gardena, CA | MillingTurningWeldingEDMGrindingFinishing | ISO 9001, AS9100 |
| C & S Aerospace, Inc Milling, Turning, EDM | Fullerton, CA | MillingTurningEDM | - |
| California Manufacturing Inc Milling, Turning, Laser, Punching, Bending, Welding · ISO 9001, AS9100, ITAR | Anaheim, CA | MillingTurningLaserPunchingBendingWelding | ISO 9001, AS9100, ITAR |
| Charles Meisner, Inc Milling, Turning, Bending, Welding, Stamping, EDM, Grinding · ISO 9001, AS9100 | Upland, CA | MillingTurningBendingWeldingStampingEDMGrinding | ISO 9001, AS9100 |
| Curry Precision Machining LLC Milling, Turning | Winchester, CA | MillingTurning | - |
| Delta Machine Company, LLC Milling, Turning, Welding, Grinding | Harbor City, CA | MillingTurningWeldingGrinding | - |
| Engineering Design Industries, Inc Milling, Turning, Laser, Welding, Stamping, EDM, Grinding, Finishing | S El Monte, CA | MillingTurningLaserWeldingStampingEDMGrindingFinishing | - |
| Farrar Aerospace LLC Milling, Turning · ISO 9001, ITAR | Ontario, CA | MillingTurning | ISO 9001, ITAR |
| Feral Productions LLC Milling, Turning, Welding, Grinding, Finishing, Assembly | Tracy, CA | MillingTurningWeldingGrindingFinishingAssembly | - |
| General Grinding & Mfg Co LLC Milling, Turning, Welding, Grinding, Finishing · ISO 9001, AS9100 | La Mirada, CA | MillingTurningWeldingGrindingFinishing | ISO 9001, AS9100 |
| Hasten Applied CNC LLC Milling, Turning, Swiss, Laser, Bending, Welding, Stamping, EDM, Finishing · ISO 9001, ITAR | Riverside, CA | MillingTurningSwissLaserBendingWeldingStampingEDMFinishing | ISO 9001, ITAR |
| Helical Machining, Inc Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly | Sun Valley, CA | MillingTurningWeldingEDMGrindingFinishingAssembly | - |
| Hi Performance Machine & Metals, Inc Milling, Turning, Waterjet, EDM · ISO 9001 | Lakeside, CA | MillingTurningWaterjetEDM | ISO 9001 |
| Long Machine Milling, Turning, Grinding | Temecula, CA | MillingTurningGrinding | - |
| Loutech LLC Milling, Turning, Swiss, Finishing · ISO 9001, AS9100, ITAR | Chino, CA | MillingTurningSwissFinishing | ISO 9001, AS9100, ITAR |
| LT CNC Machining Inc. Milling, Turning, Welding · AS9100 | San Diego, CA | MillingTurningWelding | AS9100 |
| Millworx Precision Machining Inc Milling, Turning · ISO 9001, AS9100 | Corona, CA | MillingTurning | ISO 9001, AS9100 |
| MMG Corp Milling, Turning, Finishing, Assembly · ISO 9001 | Ontario, CA | MillingTurningFinishingAssembly | ISO 9001 |
| Precision Manufacturing Milling, Turning · ISO 9001, ITAR, ISO 13485 | Roseville, CA | MillingTurning | ISO 9001, ITAR, ISO 13485 |
| S & S Commercial Fishing Equipment, Incorporated Milling, Turning, Welding | Roseville, CA | MillingTurningWelding | - |
| SDS Engineering Milling, Turning, Grinding · ISO 9001 | Sun Valley, CA | MillingTurningGrinding | ISO 9001 |
| Serrano Industries, Inc Milling, Turning, Swiss, EDM, Grinding · ISO 9001, AS9100 | Santa Fe Springs, CA | MillingTurningSwissEDMGrinding | ISO 9001, AS9100 |
| Sheetmetal Engineering Inc Milling, Laser, Punching, Bending, Welding · ISO 9001, AS9100 | Simi Valley, CA | MillingLaserPunchingBendingWelding | ISO 9001, AS9100 |
| Sonoma Industries Inc Milling, Turning, Swiss · ISO 9001, AS9100, ITAR | Bell Gardens, CA | MillingTurningSwiss | ISO 9001, AS9100, ITAR |
| SP Manufacturing Inc Milling, Turning, Welding, Finishing · ISO 9001, AS9100 | Livermore, CA | MillingTurningWeldingFinishing | ISO 9001, AS9100 |
| T&K Machine Milling, Turning, Welding, EDM, Grinding | Livermore, CA | MillingTurningWeldingEDMGrinding | - |
| Topnotch Quality Works Milling, Turning · ISO 9001, ITAR | Pacoima, CA | MillingTurning | ISO 9001, ITAR |
| TQ Systems Inc Milling, Turning, EDM, Assembly | Lake Forest, CA | MillingTurningEDMAssembly | - |
| W Machine Works Inc Milling, Turning, Assembly · ISO 9001, AS9100, ITAR | San Fernando, CA | MillingTurningAssembly | ISO 9001, AS9100, ITAR |
| ZI Machine Milling, Turning · ISO 9001, AS9100, ITAR | El Dorado Hills, CA | MillingTurning | ISO 9001, AS9100, ITAR |