| V&S Engineering Milling, Turning, EDM, Grinding · ISO 9001, AS9100, ITAR | Huntington Beach, CA | MillingTurningEDMGrinding | ISO 9001, AS9100, ITAR |
| W Machine Works Inc Milling, Turning, Assembly · ISO 9001, AS9100, ITAR | San Fernando, CA | MillingTurningAssembly | ISO 9001, AS9100, ITAR |
| Wess-Del Inc Milling, Waterjet, EDM, Assembly · ISO 9001, AS9100, ITAR, ISO 13485 | San Jose, CA | MillingWaterjetEDMAssembly | ISO 9001, AS9100, ITAR, ISO 13485 |
| Will-Mann Inc Turning, Laser, Punching, Bending, Welding · ISO 9001, AS9100 | Fullerton, CA | TurningLaserPunchingBendingWelding | ISO 9001, AS9100 |
| ZI Machine Milling, Turning · ISO 9001, AS9100, ITAR | El Dorado Hills, CA | MillingTurning | ISO 9001, AS9100, ITAR |
| 5H Sheet Metal Fabrication, Inc Punching, Bending, Welding · ISO 9001, AS9100, ITAR | Orange, CA | PunchingBendingWelding | ISO 9001, AS9100, ITAR |
| Advanced Machining Techniques Inc Milling, Turning, Welding, Assembly · ISO 9001, AS9100, ISO 13485 | Morgan Hill, CA | MillingTurningWeldingAssembly | ISO 9001, AS9100, ISO 13485 |
| Advanced Thrtical Concepts Inc Milling, Turning, Swiss, Laser, Waterjet, Welding, Grinding, Finishing | Camarillo, CA | MillingTurningSwissLaserWaterjetWeldingGrindingFinishing | - |
| California Amforge Corp Welding, Forging · ISO 9001, AS9100, ITAR, NADCAP | Azusa, CA | WeldingForging | ISO 9001, AS9100, ITAR, NADCAP |
| Fabrication Technologies Industries, Inc Milling, Waterjet, Bending, Welding, Forging | National City, CA | MillingWaterjetBendingWeldingForging | - |
| Hoosier, Inc Turning · ISO 9001, ITAR, ISO 13485 | Corona, CA | Turning | ISO 9001, ITAR, ISO 13485 |
| J and J Custom Machining L.L.C Milling, Turning · ISO 9001 | Camarillo, CA | MillingTurning | ISO 9001 |
| Mac Cal Co Welding · ISO 13485 | San Jose, CA | Welding | ISO 13485 |
| Pacific Maritime Industries Corp Milling, Turning, Laser, Waterjet, Punching, Bending, Welding · ISO 9001 | San Diego, CA | MillingTurningLaserWaterjetPunchingBendingWelding | ISO 9001 |
| Pimtad Aerospace LLC Milling, Turning, Swiss, Welding, Grinding, Assembly · AS9100 | Valencia, CA | MillingTurningSwissWeldingGrindingAssembly | AS9100 |
| Prototek Milling, Turning, Bending, Laser, Welding, Waterjet, EDM, Casting, Metal AM · ISO 9001, AS9100, ITAR, CMMC | Rancho Cordova, CA | MillingTurningBendingLaserWeldingWaterjetEDMCastingMetal AM | ISO 9001, AS9100, ITAR, CMMC |
| Rache Corp Laser, Welding · ISO 9001, AS9100, ITAR | Camarillo, CA | LaserWelding | ISO 9001, AS9100, ITAR |
| Scandic Springs, Inc Stamping · ISO 9001 | San Leandro, CA | Stamping | ISO 9001 |
| A&A Machine Milling, Swiss, EDM · AS9100 | Gardena, CA | MillingSwissEDM | AS9100 |
| Accuturn Corp Milling, Turning, Swiss, Grinding · AS9100 | Moreno Valley, CA | MillingTurningSwissGrinding | AS9100 |
| Advanced Engineering & EDM, Inc Milling, Turning, Laser, Stamping, EDM, Grinding | Poway, CA | MillingTurningLaserStampingEDMGrinding | - |
| Advantage Metal Products, Inc Milling, Bending, Finishing, Assembly · ITAR | Livermore, CA | MillingBendingFinishingAssembly | ITAR |
| All Time Machine Inc Milling, Turning, Finishing · AS9100 | Ontario, CA | MillingTurningFinishing | AS9100 |
| Amex Plating Inc Finishing | Santa Clara, CA | Finishing | - |
| AMS Manufacturing Welding, EDM, Finishing, Assembly | San Jose, CA | WeldingEDMFinishingAssembly | - |
| Ascend Mfg Corp Milling, Laser, Welding, Stamping, Finishing | Anaheim, CA | MillingLaserWeldingStampingFinishing | - |
| Atmosphere Machining LLC Milling, Turning, Waterjet, Welding, Finishing · ITAR | Tehachapi, CA | MillingTurningWaterjetWeldingFinishing | ITAR |
| Braun Co. Engineering LLC Milling, Turning, Swiss, Grinding | Signal Hill, CA | MillingTurningSwissGrinding | - |
| Chromal Plating Co Grinding, Finishing | Los Angeles, CA | GrindingFinishing | - |
| Cji Process Systems Inc Finishing | Santa Fe Springs, CA | Finishing | - |
| CNC Machining & Engineering Inc Milling, Turning, Swiss | Ontario, CA | MillingTurningSwiss | - |
| Defense & Aerospace Manufacturing LLC Welding, Grinding, Finishing, Assembly | Rancho Cordova, CA | WeldingGrindingFinishingAssembly | - |
| Donal Machine Inc Laser, Welding, Finishing · NADCAP | Petaluma, CA | LaserWeldingFinishing | NADCAP |
| DP Machining Inc Milling, Turning, Swiss, Stamping, Finishing | La Verne, CA | MillingTurningSwissStampingFinishing | - |
| Eastwood Machine, LLC Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding, Finishing, Assembly | Santee, CA | MillingTurningLaserWaterjetWeldingEDMGrindingFinishingAssembly | - |
| Elco Machine Company Milling, Turning, Finishing | San Luis Obispo, CA | MillingTurningFinishing | - |
| Electron Plating III, Inc Finishing · ITAR, NADCAP | Garden Grove, CA | Finishing | ITAR, NADCAP |
| Electronic Carbide, Inc Milling, Turning, EDM, Grinding · ITAR | Grass Valley, CA | MillingTurningEDMGrinding | ITAR |
| Engineering Design Industries, Inc Milling, Turning, Laser, Welding, Stamping, EDM, Grinding, Finishing | S El Monte, CA | MillingTurningLaserWeldingStampingEDMGrindingFinishing | - |
| Feral Productions LLC Milling, Turning, Welding, Grinding, Finishing, Assembly | Tracy, CA | MillingTurningWeldingGrindingFinishingAssembly | - |
| Halcyon Manufacturing Inc Milling, Turning, Bending, Welding, EDM, Finishing, Assembly · ITAR | San Jose, CA | MillingTurningBendingWeldingEDMFinishingAssembly | ITAR |
| Halfab, Inc Milling, Turning, Welding, Finishing | Livermore, CA | MillingTurningWeldingFinishing | - |
| Helical Machining, Inc Milling, Turning, Welding, EDM, Grinding, Finishing, Assembly | Sun Valley, CA | MillingTurningWeldingEDMGrindingFinishingAssembly | - |
| Hogin Machine, Inc Milling, Turning, Swiss, Waterjet, Bending, Welding | Santa Ana, CA | MillingTurningSwissWaterjetBendingWelding | - |
| HP Machine & Engineering Inc Milling, Turning, EDM | San Jose, CA | MillingTurningEDM | - |
| Infiniti Manufacture Milling, Welding, Finishing | Corona, CA | MillingWeldingFinishing | - |
| Jaco Engineering Milling, Turning, Bending, Welding, EDM, Grinding, Finishing, Assembly · NADCAP | Anaheim, CA | MillingTurningBendingWeldingEDMGrindingFinishingAssembly | NADCAP |
| JWP Manufacturing Milling, Swiss, EDM | Santa Clara, CA | MillingSwissEDM | - |
| Laserbend, LLC Laser, Bending, Welding, Finishing | Tujunga, CA | LaserBendingWeldingFinishing | - |
| Ltmt Machining LLC Milling, Finishing | Santa Clara, CA | MillingFinishing | - |