| TBT Machining Milling | Fremont, CA | Milling | - |
| TDC Manufacturing Inc Milling, Turning, Laser | Redlands, CA | MillingTurningLaser | - |
| ThermoAir Grinding | Burbank, CA | Grinding | - |
| TM Industries Inc Milling, Welding | Santa Clara, CA | MillingWelding | - |
| Tobar Industries Milling, Turning, Bending, Welding | San Jose, CA | MillingTurningBendingWelding | - |
| Tough Cut Manufacturing Milling, Turning · AS9100 | Anaheim, CA | MillingTurning | AS9100 |
| TQ Systems Inc Milling, Turning, EDM, Assembly | Lake Forest, CA | MillingTurningEDMAssembly | - |
| True Position Machining Inc Milling, Turning · AS9100 | Santa Ana, CA | MillingTurning | AS9100 |
| TTN Machining, Inc Milling, Turning | Spring Valley, CA | MillingTurning | - |
| Van's Manufacturing, Inc Milling, Turning | Simi Valley, CA | MillingTurning | - |
| Veco Technologies, Inc. Milling, Turning, Welding, EDM | Fresno, CA | MillingTurningWeldingEDM | - |
| Vinatech Engineering Inc Milling, Laser, Bending, Welding, Assembly · ITAR | San Diego, CA | MillingLaserBendingWeldingAssembly | ITAR |
| Weldtec Manufacturing, Inc Welding | Waterford, CA | Welding | - |
| Wildfactory Milling, Turning, Waterjet | Camarillo, CA | MillingTurningWaterjet | - |
| Wire Works EDM Inc Milling, Turning, Welding, EDM, Assembly · CMMC | Santa Ana, CA | MillingTurningWeldingEDMAssembly | CMMC |
| Yuhas Tooling & Machining Inc Milling, Turning, Grinding, Finishing | Milpitas, CA | MillingTurningGrindingFinishing | - |