| San Diego Precision Machining Inc Milling, Turning, Welding, EDM · ISO 9001, AS9100 | San Diego, CA | MillingTurningWeldingEDM | ISO 9001, AS9100 |
| Santa Lucia Manufacturing, Inc Milling, Turning, Grinding | Atascadero, CA | MillingTurningGrinding | - |
| Milner's Anodizing Finishing · NADCAP | Santa Rosa, CA | Finishing | NADCAP |
| Pleasanton Tool & Manufacturing Inc Milling, Turning, Welding, EDM · ITAR | Pleasanton, CA | MillingTurningWeldingEDM | ITAR |
| A.m.i. Engineering Co LLC Milling, Turning, Finishing · ISO 9001, ITAR | Santa Ana, CA | MillingTurningFinishing | ISO 9001, ITAR |
| Acosta Sheet Metal Manufacturing Bending | San Jose, CA | Bending | - |
| Alex Machining Corp Milling, Turning | San Diego, CA | MillingTurning | - |
| Axis Product Development, Inc Milling · ITAR | Santa Ana, CA | Milling | ITAR |
| B & Z Manufacturing Co Inc Milling, Turning, Grinding · ISO 9001 | San Jose, CA | MillingTurningGrinding | ISO 9001 |
| Casco Machining Inc. Milling, Turning, Welding · ISO 9001 | San Jose, CA | MillingTurningWelding | ISO 9001 |
| Coast Metal Cutting Turning | San Jose, CA | Turning | - |
| Coast Precision Enterprises Milling, Turning · ISO 9001, AS9100, ITAR | San Diego, CA | MillingTurning | ISO 9001, AS9100, ITAR |
| Computer Integrated Machining Inc Milling, Turning, Waterjet, Welding, Stamping, EDM, Grinding, Assembly · ISO 9001, ITAR | Santee, CA | MillingTurningWaterjetWeldingStampingEDMGrindingAssembly | ISO 9001, ITAR |
| CPK Manufacturing Milling, Turning, EDM · ISO 9001 | San Jose, CA | MillingTurningEDM | ISO 9001 |
| Crater Industries LLC Milling, Turning, EDM, Grinding, Assembly | Santa Clarita, CA | MillingTurningEDMGrindingAssembly | - |
| Custom Machine Milling · ISO 9001 | San Luis Obispo, CA | Milling | ISO 9001 |
| Ea Machining Inc Milling, Turning · AS9100 | Santa Clara, CA | MillingTurning | AS9100 |
| Eastwood Machine, LLC Milling, Turning, Laser, Waterjet, Welding, EDM, Grinding, Finishing, Assembly | Santee, CA | MillingTurningLaserWaterjetWeldingEDMGrindingFinishingAssembly | - |
| Euro Machining Enterprise Inc Milling, Turning, Welding, Grinding, Assembly · ISO 9001 | Santa Clara, CA | MillingTurningWeldingGrindingAssembly | ISO 9001 |
| Futuristics Machine, Inc. Welding · ISO 9001 | San Diego, CA | Welding | ISO 9001 |
| General Foundry Service Corp Casting, Finishing · ISO 9001, ITAR | San Leandro, CA | CastingFinishing | ISO 9001, ITAR |
| Gentec Manufacturing Inc Milling, Turning, Waterjet, Welding, EDM, Grinding, Finishing · ISO 9001, AS9100, NADCAP, ISO 13485 | San Jose, CA | MillingTurningWaterjetWeldingEDMGrindingFinishing | ISO 9001, AS9100, NADCAP, ISO 13485 |
| Group Manufacturing Services Inc Milling, Turning, Laser, Punching, Bending, Welding, Assembly · ISO 9001 | San Jose, CA | MillingTurningLaserPunchingBendingWeldingAssembly | ISO 9001 |
| Halcyon Manufacturing Inc Milling, Turning, Bending, Welding, EDM, Finishing, Assembly · ITAR | San Jose, CA | MillingTurningBendingWeldingEDMFinishingAssembly | ITAR |
| High Speed CNC Milling, Turning · ISO 9001, AS9100 | Santa Clara, CA | MillingTurning | ISO 9001, AS9100 |
| Kaydek Machining, Inc Milling, Turning, Finishing · ISO 9001, AS9100 | San Jose, CA | MillingTurningFinishing | ISO 9001, AS9100 |
| Krisalis Precision Machining Milling, Turning | San Andreas, CA | MillingTurning | - |
| LNT Machining Inc Milling, Turning | Santa Clara, CA | MillingTurning | - |
| Miramar Metal Processing Inc Welding, Finishing · ITAR, NADCAP | San Diego, CA | WeldingFinishing | ITAR, NADCAP |
| Morena Welding Inc Welding | San Diego, CA | Welding | - |
| MVN Machining LLC Milling, Turning | Santa Clara, CA | MillingTurning | - |
| New World Machining Inc Milling, Turning, Welding | San Jose, CA | MillingTurningWelding | - |
| Next Intent, Inc Milling, Turning, Welding, EDM, Grinding, Assembly · ISO 9001, ITAR | San Luis Obispo, CA | MillingTurningWeldingEDMGrindingAssembly | ISO 9001, ITAR |
| Odyssey Machining Milling, Finishing · ISO 9001, ITAR | San Jose, CA | MillingFinishing | ISO 9001, ITAR |
| Omega Precision Milling, Turning · ISO 9001 | Santa Fe Springs, CA | MillingTurning | ISO 9001 |
| Pegasus Machining Solutions Milling, Turning, Finishing | San Jose, CA | MillingTurningFinishing | - |
| Proto Solutions and Machining Turning, Welding, Assembly | San Diego, CA | TurningWeldingAssembly | - |
| Qualified Machine Shop Milling, Turning | San Diego, CA | MillingTurning | - |
| Ricaurte Precision Inc Milling, Turning, Swiss, Laser, EDM, Finishing, Assembly · ISO 9001, ITAR | Santa Ana, CA | MillingTurningSwissLaserEDMFinishingAssembly | ISO 9001, ITAR |
| Rivtec LLC Laser, Bending, Welding, Assembly | Santa Ana, CA | LaserBendingWeldingAssembly | - |
| San Jose Die Casting & Machining Corp Casting | Lincoln, CA | Casting | - |
| Serrano Industries, Inc Milling, Turning, Swiss, EDM, Grinding · ISO 9001, AS9100 | Santa Fe Springs, CA | MillingTurningSwissEDMGrinding | ISO 9001, AS9100 |
| 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 |
| Top Precision Milling, Turning, Assembly · ISO 9001, ITAR | San Luis Obispo, CA | MillingTurningAssembly | ISO 9001, ITAR |
| 6S Machining Enterprises LLC Milling, Welding · ISO 9001, AS9100, ITAR, NADCAP | San Marcos, CA | MillingWelding | ISO 9001, AS9100, ITAR, NADCAP |
| AC Manufacturing Milling, Turning, Welding | San Jose, CA | MillingTurningWelding | - |
| 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 | - |
| AMS Manufacturing Welding, EDM, Finishing, Assembly | San Jose, CA | WeldingEDMFinishingAssembly | - |