| S & B Precision Manufacturing LLC Milling | Vista, CA | Milling | - |
| S & S Commercial Fishing Equipment, Incorporated Milling, Turning, Welding | Roseville, CA | MillingTurningWelding | - |
| Absolute Machining, Inc Milling, Turning | Chatsworth, CA | MillingTurning | - |
| Aerotech Precision Machining, Inc Milling, Turning, Assembly · ISO 9001, AS9100 | Lancaster, CA | MillingTurningAssembly | ISO 9001, AS9100 |
| Airtronics Metal Products Milling, Laser, Punching, Bending, Welding, Assembly · ISO 9001, ISO 13485 | Morgan Hill, CA | MillingLaserPunchingBendingWeldingAssembly | ISO 9001, ISO 13485 |
| All Time Machine Inc Milling, Turning, Finishing · AS9100 | Ontario, CA | MillingTurningFinishing | AS9100 |
| Alpha Precision CNC, LLC Milling, Turning | Fremont, CA | MillingTurning | - |
| Antonio's Metal Works, Inc Welding | El Cajon, CA | Welding | - |
| BMW Precision Machining Milling, Turning, Swiss · ITAR | Oceanside, CA | MillingTurningSwiss | ITAR |
| Braun Co. Engineering LLC Milling, Turning, Swiss, Grinding | Signal Hill, CA | MillingTurningSwissGrinding | - |
| Buddy Bar Casting, LLC Milling, Casting | South Gate, CA | MillingCasting | - |
| Burnet Machining Inc Milling, Turning | Goleta, CA | MillingTurning | - |
| CalWest MFG Milling, Turning, Laser, Waterjet, Bending, Welding · ISO 9001, ITAR | Fontana, CA | MillingTurningLaserWaterjetBendingWelding | ISO 9001, ITAR |
| Cutting Edge Manufacturing Milling, Turning, Assembly · ISO 9001, AS9100 | Newbury Park, CA | MillingTurningAssembly | ISO 9001, AS9100 |
| Delta Hi-Tech Milling, Turning, Swiss, Laser, Bending, Welding, EDM, Finishing, Assembly · ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 | Chatsworth, CA | MillingTurningSwissLaserBendingWeldingEDMFinishingAssembly | ISO 9001, AS9100, ITAR, NADCAP, ISO 13485 |
| Dinucci Corp Milling, Turning · AS9100 | Concord, CA | MillingTurning | AS9100 |
| Dynamic Loop Inc Milling, Turning, Laser, Waterjet, Finishing | Camarillo, CA | MillingTurningLaserWaterjetFinishing | - |
| Exact CNC Industries Inc Milling, Turning, Swiss, Laser · ISO 9001, AS9100, ITAR | Chatsworth, CA | MillingTurningSwissLaser | ISO 9001, AS9100, ITAR |
| Fabriquick LLC Milling, Bending | Benicia, CA | MillingBending | - |
| Feral Productions LLC Milling, Turning, Welding, Grinding, Finishing, Assembly | Tracy, CA | MillingTurningWeldingGrindingFinishingAssembly | - |
| Heighten America, Inc Milling, Turning, Welding, Assembly · ISO 9001 | Oakdale, CA | MillingTurningWeldingAssembly | ISO 9001 |
| Heimaster Metal Works Inc Bending, Welding | Lakeside, CA | BendingWelding | - |
| Inland Marine Industries Inc Milling, Turning, Waterjet, Punching, Bending, Welding, Grinding, Finishing · ISO 9001, ITAR | Hayward, CA | MillingTurningWaterjetPunchingBendingWeldingGrindingFinishing | ISO 9001, ITAR |
| Innovation Alley Milling, Turning, Bending, Welding | Fresno, CA | MillingTurningBendingWelding | - |
| J Mark Co Milling, Turning, Laser, Punching, Bending, Welding, Finishing, Assembly · ISO 9001, ITAR | Vista, CA | MillingTurningLaserPunchingBendingWeldingFinishingAssembly | ISO 9001, ITAR |
| Jaco Engineering Milling, Turning, Bending, Welding, EDM, Grinding, Finishing, Assembly · NADCAP | Anaheim, CA | MillingTurningBendingWeldingEDMGrindingFinishingAssembly | NADCAP |
| KD Precision Machining Inc Milling, Turning · AS9100 | Corona, CA | MillingTurning | AS9100 |
| La Gauge Co Milling, Turning, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR | Sun Valley, CA | MillingTurningEDMGrindingFinishing | ISO 9001, AS9100, ITAR |
| 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 |
| Megla Manufacturing, Inc. Milling, Bending, Laser, Welding, Waterjet | National City, CA | MillingBendingLaserWeldingWaterjet | - |
| Miller CNC Milling, Turning, Welding, Grinding · ISO 9001, AS9100 | Chula Vista, CA | MillingTurningWeldingGrinding | ISO 9001, AS9100 |
| Mono Engineering Corp Turning, Welding, EDM · ISO 9001 | Chatsworth, CA | TurningWeldingEDM | ISO 9001 |
| Protool Co Milling, Turning, Swiss · ISO 9001 | Tustin, CA | MillingTurningSwiss | ISO 9001 |
| Qualitask Inc Milling, Turning, Swiss, Welding, EDM, Grinding, Finishing, Assembly · ISO 9001, AS9100 | Anaheim, CA | MillingTurningSwissWeldingEDMGrindingFinishingAssembly | ISO 9001, AS9100 |
| R & G Precision Machining Inc Milling, Turning · ISO 9001, AS9100 | Oceanside, CA | MillingTurning | ISO 9001, AS9100 |
| RBH Aerospace Inc Milling, Turning, Waterjet, Bending | Lakewood, CA | MillingTurningWaterjetBending | - |
| Redwood Machine Works, Inc Waterjet, Welding · ISO 9001, AS9100 | Oakland, CA | WaterjetWelding | ISO 9001, AS9100 |
| Rincon Engineering Corporation Milling, Turning, Laser, Waterjet, Punching, Welding, Stamping, EDM, Finishing · ISO 9001, AS9100 | Carpinteria, CA | MillingTurningLaserWaterjetPunchingWeldingStampingEDMFinishing | ISO 9001, AS9100 |
| S R Machining, Inc Milling, Turning, Swiss, Welding, Casting · ISO 9001, AS9100 | Norco, CA | MillingTurningSwissWeldingCasting | ISO 9001, AS9100 |
| SP Manufacturing Inc Milling, Turning, Welding, Finishing · ISO 9001, AS9100 | Livermore, CA | MillingTurningWeldingFinishing | ISO 9001, AS9100 |
| Stines' Machine, Inc Milling, Turning · ISO 9001, ITAR | Vista, CA | MillingTurning | ISO 9001, ITAR |
| Szabo Precision Milling, Turning · ISO 9001, AS9100 | Diamond Springs, CA | MillingTurning | ISO 9001, AS9100 |
| 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 | - |
| True Precision Machining, Inc Milling, Turning, Swiss, Welding, Stamping, EDM, Grinding, Finishing · ISO 9001, AS9100, ITAR, CMMC | Buellton, CA | MillingTurningSwissWeldingStampingEDMGrindingFinishing | ISO 9001, AS9100, ITAR, CMMC |
| TTN Machining, Inc Milling, Turning | Spring Valley, CA | MillingTurning | - |
| Vision Aerospace LLC Milling, Turning, EDM · AS9100 | Northridge, CA | MillingTurningEDM | AS9100 |
| ZI Machine Milling, Turning · ISO 9001, AS9100, ITAR | El Dorado Hills, CA | MillingTurning | ISO 9001, AS9100, ITAR |