| Elmira Stamping & Mfg. Corp Bending, Welding, Stamping, Finishing, Assembly · ISO 9001 | Elmira, NY | BendingWeldingStampingFinishingAssembly | ISO 9001 |
| Steel River Manufacturing, LLC Milling, Grinding · ISO 9001 | Spring, TX | MillingGrinding | ISO 9001 |
| Models & Tools Inc Milling, Turning, Welding · AS9100 | Shelby Township, MI | MillingTurningWelding | AS9100 |
| Sintel Inc Laser, Punching, Bending, Welding, Finishing, Assembly | Spring Lake, MI | LaserPunchingBendingWeldingFinishingAssembly | - |
| Steel Werx Bending, Welding | Santa Clara, CA | BendingWelding | - |
| Steeltron Metal Works Bending, Welding | San Antonio, TX | BendingWelding | - |
| Swanton Welding & Machining Co Inc Milling, Laser, Bending, Welding, Finishing, Assembly | Swanton, OH | MillingLaserBendingWeldingFinishingAssembly | - |
| Wess-Del Inc Milling, Waterjet, EDM, Assembly · ISO 9001, AS9100, ITAR, ISO 13485 | San Jose, CA | MillingWaterjetEDMAssembly | ISO 9001, AS9100, ITAR, ISO 13485 |
| SOS Steel Co Inc Welding | Santa Clara, CA | Welding | - |
| Steel Specialties Inc. Welding | El Paso, TX | Welding | - |
| Data Electronic Services Finishing · ISO 9001, ITAR | Santa Ana, CA | Finishing | ISO 9001, ITAR |
| El Ironworks LLC Bending, Welding, Finishing · ISO 9001 | Toney, AL | BendingWeldingFinishing | ISO 9001 |
| Electronic Sheet Metal Craftsm Milling, Turning, Laser, Punching, Bending, Welding, Grinding, Assembly | Stoughton, MA | MillingTurningLaserPunchingBendingWeldingGrindingAssembly | - |
| Grain Belt Supply Company, Inc Turning, Laser, Waterjet, Bending, Welding, Grinding, Finishing, Assembly | Salina, KS | TurningLaserWaterjetBendingWeldingGrindingFinishingAssembly | - |
| Hards Fabrication & Welding, Inc Milling, Turning, Waterjet, Bending, Welding | Seneca, PA | MillingTurningWaterjetBendingWelding | - |
| M B Steel Milling, Bending, Laser, Welding, Stamping | St. Louis, MO | MillingBendingLaserWeldingStamping | - |
| Quality Welding Service Inc Laser, Welding | Suamico, WI | LaserWelding | - |
| Selective Industries, Inc Laser, Welding, Stamping · ISO 9001 | Marine City, MI | LaserWeldingStamping | ISO 9001 |
| Slagel Manufacturing, Inc Bending, Welding, Finishing · ISO 9001 | Forrest, IL | BendingWeldingFinishing | ISO 9001 |
| SpecWeld Milling, Welding, Assembly · ISO 9001 | Lake Orion, MI | MillingWeldingAssembly | ISO 9001 |
| Sse Steel Fabrication Milling, Turning, Bending, Welding | Saint Bernard, LA | MillingTurningBendingWelding | - |
| Steelcrest Precision, Inc Milling, Turning, Swiss, Welding, EDM, Grinding, Assembly · ISO 9001, AS9100 | Wauseon, OH | MillingTurningSwissWeldingEDMGrindingAssembly | ISO 9001, AS9100 |
| Stellar Industries LLC Laser, Bending, Welding, Stamping, Finishing · ISO 9001 | Nappanee, IN | LaserBendingWeldingStampingFinishing | ISO 9001 |
| Striking Precision Welding & Fabrication Milling, Bending, Welding · ISO 9001, ITAR | Cedar Park, TX | MillingBendingWelding | ISO 9001, ITAR |
| Superior Steel Fabrication Welding, Finishing · ISO 9001, AS9100 | Eugene, OR | WeldingFinishing | ISO 9001, AS9100 |
| Wheeler Industries Inc Milling, Turning, Bending, Welding | Spokane Valley, WA | MillingTurningBendingWelding | - |
| A-1 Steel, Inc. Welding | Sparks, NV | Welding | - |
| Alamo City Custom Welding & Construction Welding | San Antonio, TX | Welding | - |
| Connelly Machine WKS Milling, Turning, Waterjet, Welding, Grinding · ISO 9001, ITAR | Santa Ana, CA | MillingTurningWaterjetWeldingGrinding | ISO 9001, ITAR |
| Electro Mechanical Products Assembly · ISO 9001 | Lakewood, CO | Assembly | ISO 9001 |
| Elsner Engineering Works Inc Milling, Turning, Welding, EDM, Grinding · ISO 9001 | Hanover, PA | MillingTurningWeldingEDMGrinding | ISO 9001 |
| Jerry's Welding & Machine Welding | San Diego, CA | Welding | - |
| P&M Steel Company Welding | Sioux Falls, SD | Welding | - |
| Selectwo Machine Company, Inc Milling, Turning, Welding, Stamping, EDM · ISO 9001, AS9100 | Longwood, FL | MillingTurningWeldingStampingEDM | ISO 9001, AS9100 |
| Selway Machine Tool Co Inc Milling, Turning, Metal AM | Salt Lake City, UT | MillingTurningMetal AM | - |
| Shamong Manufacturing Laser, Punching, Bending, Welding, Stamping, Grinding, Finishing, Assembly · AS9100, NADCAP | Shamong, NJ | LaserPunchingBendingWeldingStampingGrindingFinishingAssembly | AS9100, NADCAP |
| Shamrock Machining Inc Milling, Turning, Bending, Laser, Welding · ISO 9001 | Spokane Valley, WA | MillingTurningBendingLaserWelding | ISO 9001 |
| Sheetmetal Engineering Inc Milling, Laser, Punching, Bending, Welding · ISO 9001, AS9100 | Simi Valley, CA | MillingLaserPunchingBendingWelding | ISO 9001, AS9100 |
| Shelby Supply Co LLC Welding · ISO 9001 | Tolland, CT | Welding | ISO 9001 |
| Shieldcoat Technologies Inc Finishing, Assembly · ISO 9001, ITAR | Lufkin, TX | FinishingAssembly | ISO 9001, ITAR |
| Shoemaker Mfg Solutions Inc Milling, Turning, Laser, Waterjet, Punching, Bending, Welding, Stamping, Grinding · ISO 9001, AS9100, ITAR, CMMC | Souderton, PA | MillingTurningLaserWaterjetPunchingBendingWeldingStampingGrinding | ISO 9001, AS9100, ITAR, CMMC |
| Sonic Manufacturing Corporation Milling, Welding, EDM, Grinding, Finishing, Assembly · AS9100, NADCAP | Elk Grove Village, IL | MillingWeldingEDMGrindingFinishingAssembly | AS9100, NADCAP |
| Specialty Engineering Inc Laser, Punching, Bending, Welding, Assembly · ISO 9001 | Saint Paul, MN | LaserPunchingBendingWeldingAssembly | ISO 9001 |
| Steelhead Composites, Inc Welding · ISO 9001, AS9100 | Golden, CO | Welding | ISO 9001, AS9100 |
| Steelhead Metal Corp Milling, Turning, Laser, Waterjet, Bending, EDM, Finishing · ISO 9001 | Nampa, ID | MillingTurningLaserWaterjetBendingEDMFinishing | ISO 9001 |
| Swift Industries Inc Milling, Laser, Punching, Bending, Welding, Stamping, Grinding, Finishing, Assembly · ISO 9001 | Suwanee, GA | MillingLaserPunchingBendingWeldingStampingGrindingFinishingAssembly | ISO 9001 |
| Texas Specialty Steel Welding | San Antonio, TX | Welding | - |
| Ataco Steel Products Corp Milling, Laser, Welding, Stamping · ISO 9001 | Cedarburg, WI | MillingLaserWeldingStamping | ISO 9001 |
| Axis Product Development, Inc Milling · ITAR | Santa Ana, CA | Milling | ITAR |
| Deltisan Engineering LLC Milling, Turning, Punching, Bending, Welding, Finishing, Assembly · ISO 9001 | Parker, CO | MillingTurningPunchingBendingWeldingFinishingAssembly | ISO 9001 |