| Santa Lucia Manufacturing, Inc Milling, Turning, Grinding | Atascadero, CA | MillingTurningGrinding | - |
| A.m.i. Engineering Co LLC Milling, Turning, Finishing · ISO 9001, ITAR | Santa Ana, CA | MillingTurningFinishing | ISO 9001, ITAR |
| Ea Machining Inc Milling, Turning · AS9100 | Santa Clara, CA | MillingTurning | AS9100 |
| Euro Machining Enterprise Inc Milling, Turning, Welding, Grinding, Assembly · ISO 9001 | Santa Clara, CA | MillingTurningWeldingGrindingAssembly | ISO 9001 |
| High Speed CNC Milling, Turning · ISO 9001, AS9100 | Santa Clara, CA | MillingTurning | ISO 9001, AS9100 |
| LNT Machining Inc Milling, Turning | Santa Clara, CA | MillingTurning | - |
| MVN Machining LLC Milling, Turning | Santa Clara, CA | MillingTurning | - |
| Rivtec LLC Laser, Bending, Welding, Assembly | Santa Ana, CA | LaserBendingWeldingAssembly | - |
| Sindri Engineering, LLC Milling · ISO 9001, AS9100, ITAR | Santa Ana, CA | Milling | ISO 9001, AS9100, ITAR |
| Top Machining, Inc Milling, Turning, Welding, Finishing, Assembly · ISO 9001, AS9100, ITAR | Santa Clara, CA | MillingTurningWeldingFinishingAssembly | ISO 9001, AS9100, ITAR |
| Aeg Industries, Inc Milling, Turning, Bending, Grinding · ISO 9001, ITAR | Santa Rosa, CA | MillingTurningBendingGrinding | ISO 9001, ITAR |
| Amex Plating Inc Finishing | Santa Clara, CA | Finishing | - |
| Apex HT Manufacturing Corp Milling, Turning, Finishing · ISO 9001, ITAR, CMMC | Santa Clara, CA | MillingTurningFinishing | ISO 9001, ITAR, CMMC |
| Atam LLC Milling, Turning · ISO 9001 | Santa Ana, CA | MillingTurning | ISO 9001 |
| Axis Product Development, Inc Milling · ITAR | Santa Ana, CA | Milling | ITAR |
| B & F Modern Manufacturing, Inc Milling, Turning, Assembly | Santa Ana, CA | MillingTurningAssembly | - |
| Beam on Technology Corporation Laser, Assembly · ITAR | Santa Clara, CA | LaserAssembly | ITAR |
| Beyond Precision, LLC Milling, Turning · ISO 9001, AS9100 | Santa Ana, CA | MillingTurning | ISO 9001, AS9100 |
| CB Manufacturing & Engineering Inc Milling, Turning, EDM · ISO 9001, AS9100 | Santa Ana, CA | MillingTurningEDM | ISO 9001, AS9100 |
| Cji Process Systems Inc Finishing | Santa Fe Springs, CA | Finishing | - |
| Connelly Machine WKS Milling, Turning, Waterjet, Welding, Grinding · ISO 9001, ITAR | Santa Ana, CA | MillingTurningWaterjetWeldingGrinding | ISO 9001, ITAR |
| Crater Industries LLC Milling, Turning, EDM, Grinding, Assembly | Santa Clarita, CA | MillingTurningEDMGrindingAssembly | - |
| D-Tek Manufacturing Milling, Turning · ISO 9001, AS9100, ITAR, ISO 13485 | Santa Clara, CA | MillingTurning | ISO 9001, AS9100, ITAR, ISO 13485 |
| Data Electronic Services Finishing · ISO 9001, ITAR | Santa Ana, CA | Finishing | ISO 9001, ITAR |
| Embee Processing LLC Welding, Finishing | Santa Ana, CA | WeldingFinishing | - |
| Excel Machining Milling, Turning, Bending, Welding, Waterjet · ISO 9001 | Santa Clara, CA | MillingTurningBendingWeldingWaterjet | ISO 9001 |
| Express Metal Aerospace Inc Punching, Bending · ISO 9001 | Santa Ana, CA | PunchingBending | ISO 9001 |
| Gilco Manufacturing, Inc Milling · AS9100 | Santa Fe Springs, CA | Milling | AS9100 |
| Green's Metal Cut-Off Corp Turning, Swiss | Santa Fe Springs, CA | TurningSwiss | - |
| Hitech Metalfab Inc Bending, Welding · ISO 9001 | Santa Clara, CA | BendingWelding | ISO 9001 |
| HNDO Precision Milling, Laser, Finishing | Santa Rosa, CA | MillingLaserFinishing | - |
| Hogin Machine, Inc Milling, Turning, Swiss, Waterjet, Bending, Welding | Santa Ana, CA | MillingTurningSwissWaterjetBendingWelding | - |
| Hunt Enterprises Milling, Turning, Welding | Santa Ana, CA | MillingTurningWelding | - |
| Ipanel Systems Inc Milling | Santa Clarita, CA | Milling | - |
| JP Metal Fabrication, Inc. Milling, Bending, Laser, Welding | Santa Clara, CA | MillingBendingLaserWelding | - |
| JWP Manufacturing Milling, Swiss, EDM | Santa Clara, CA | MillingSwissEDM | - |
| K-V Engineering Inc Milling, Turning, Punching, Welding | Santa Ana, CA | MillingTurningPunchingWelding | - |
| LP Precision, Inc Milling, Turning, Grinding, Finishing | Santa Clara, CA | MillingTurningGrindingFinishing | - |
| Ltmt Machining LLC Milling, Finishing | Santa Clara, CA | MillingFinishing | - |
| Luna's Sheet Metal Inc Milling, Turning, Bending, Laser, Welding | Santa Clara, CA | MillingTurningBendingLaserWelding | - |
| Marx Digital Manufacturing Inc Milling, Turning, Welding, Assembly | Santa Clara, CA | MillingTurningWeldingAssembly | - |
| Master Precision Machining Milling, Welding · ISO 9001, AS9100 | Santa Clara, CA | MillingWelding | ISO 9001, AS9100 |
| Milner's Anodizing Finishing · NADCAP | Santa Rosa, CA | Finishing | NADCAP |
| Next Tech Manufacturing Inc Milling, Welding, Finishing | Santa Clara, CA | MillingWeldingFinishing | - |
| Norotos, Inc Turning, Forging | Santa Ana, CA | TurningForging | - |
| Omega Precision Milling, Turning · ISO 9001 | Santa Fe Springs, CA | MillingTurning | ISO 9001 |
| PHD Machining LLC Milling, EDM, Assembly | Santa Clara, CA | MillingEDMAssembly | - |
| Pulse Precision LLC Milling, EDM · ISO 9001 | Santa Ana, CA | MillingEDM | ISO 9001 |
| Radian Thermal Products, Inc Milling, Casting, Finishing · ISO 9001, ITAR | Santa Clara, CA | MillingCastingFinishing | ISO 9001, ITAR |
| Rah Industries Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Finishing, Assembly · ISO 9001, AS9100, NADCAP | Santa Clarita, CA | MillingTurningLaserWaterjetPunchingBendingWeldingFinishingAssembly | ISO 9001, AS9100, NADCAP |