| Soflo Machining Corp. | Coral Springs | FL | Subcontractor |
| Solo Precision, Inc. | Rancho Cucamonga | CA | Subcontractor |
| Sonic Manufacturing Corporation | Elk Grove Village | IL | Subcontractor |
| Sonoma Precision MFG. Co. | Meridian | ID | Subcontractor |
| Soteria LLC | Anniston | AL | Subcontractor |
| South Bay Solutions, Inc. | Fremont | CA | Subcontractor |
| Southeastern Machining And Field Service, Inc. | Lancaster | OH | $0 |
| Southern Machine Works Inc. | Duncan | OK | Subcontractor |
| Southland Precision Inc. | Brownsboro | AL | Subcontractor |
| Southwestern Machine & Tool Works Inc. | Leesburg | GA | $0 |
| Southwest Metalcrafts Corp. | Tucson | AZ | Subcontractor |
| Southwest Precision, Inc. | Murrieta | CA | $0 |
| Southwest Precision Machining, L.L.C. | Tucson | AZ | Subcontractor |
| Sparkman Industries Inc. | Victoria | TX | $0 |
| Sparton Technology Corp. | Hudson | NH | $0 |
| Specified Manufacturing LLC | Mesa | AZ | $0 |
| Spire Manufacturing Solutions LLC | Colorado Springs | CO | Subcontractor |
| Sp Machine, Inc. | Hudson | MA | Subcontractor |
| SPSM Industries Inc. | Burnsville | MN | Subcontractor |
| Spyco Industries Inc. | Burr Ridge | IL | Subcontractor |
| Square Deal Machining, Inc. | Marathon | NY | Subcontractor |
| SRPM Inc. | Solon | OH | Subcontractor |
| Ssi Manufacturing Technologies Corp. | Bristol | CT | Subcontractor |
| S & S Machine, Inc. | Irving | TX | Subcontractor |
| S & S MFG Inc. | Layton | UT | $0 |
| S & S Tool & Machine Co. | Louisville | KY | Subcontractor |
| Stacy Machine & Tooling Inc. | Broomfield | CO | Subcontractor |
| Stamprite Machine Company Inc. | Manchester | CT | $0 |
| Standard Locknut, LLC | Westfield | IN | Subcontractor |
| Standard Machine, LLC | Cleveland | OH | $0 |
| Stanek Tool, LLC | New Berlin | WI | Subcontractor |
| Stanley Engineering Company, LLC | Glen Burnie | MD | Subcontractor |
| Starke Machine Co. | Fort Worth | TX | Subcontractor |
| Stark Industrial, LLC | North Canton | OH | $0 |
| Starn Tool & Manufacturing Company | Meadville | PA | Subcontractor |
| Steelville Manufacturing Co. | Steelville | MO | Subcontractor |
| Steer Machine Tool And Die Corporation | Honesdale | PA | $0 |
| Stellar Machine Incorporated | Nanticoke | PA | $0 |
| Stephens Precision, Inc. | Bradford | VT | Subcontractor |
| Sterling Precision, LLC | Clinton | MA | Subcontractor |
| Steven W Ebbe | Gardena | CA | Subcontractor |
| Stewart Industries Inc. | Cincinnati | OH | $0 |
| Stewart Precision Manufacturing Inc. | Phoenix | AZ | Subcontractor |
| Stoffel Polygon Systems, Inc. | Tuckahoe | NY | Subcontractor |
| Stoll Custom Machining Inc. | Weatherford | TX | Subcontractor |
| Stone Machine Co. Inc. | Chester | NH | Subcontractor |
| Straitek, LLC | Danbury | CT | Subcontractor |
| Straton Industries, Inc. | Stratford | CT | Subcontractor |
| Streamline Machine Source Inc. | Greenville | MI | Subcontractor |
| Strohwig Industries, Inc. | Richfield | WI | Subcontractor |
| St. Vrain Manufacturing, Inc. | Longmont | CO | Subcontractor |
| Suburban Machine, Inc. | Westford | MA | Subcontractor |
| Sugaro Corporation | Tucson | AZ | Subcontractor |
| Summit Machining Co. Ltd. | Mogadore | OH | Subcontractor |
| Superior Machine Products, Inc. | Brookfield | WI | $0 |
| Superior Machine & Tool Company Inc. | Fort Wayne | IN | $0 |
| Superior Machining And Fabrication Inc. | Muenster | TX | Subcontractor |
| Superior Metal Products, Inc. | Louviers | CO | Subcontractor |
| Superior Shooting System, LLC | Canadian | TX | $0 |
| Sureshot Precision, LLC | Tempe | AZ | Subcontractor |
| Surfix, Inc. | Palm Bay | FL | $0 |
| Swissmetric, Inc. | Grants Pass | OR | Subcontractor |
| Swiss Wire Edm | Costa Mesa | CA | $0 |
| S & W Precision Machining LLC | Commerce City | CO | Subcontractor |
| Sylhan LLC | Edgewood | NY | Subcontractor |
| Systems In Precision, Inc. | Phoenix | AZ | Subcontractor |
| Tag Engineering, Inc. | Gwynn Oak | MD | Subcontractor |
| Tamshell Corporation | Corona | CA | Subcontractor |
| TBM Princeton Precision Group, LLC | Tampa | FL | Subcontractor |
| TCS Industries, Inc. | Rochester | NY | Subcontractor |
| Team Technologies, Inc. | Albuquerque | NM | Subcontractor |
| Team Tool & Technology Inc. | Cameron | MO | $0 |
| Tech Heavy Industries, Inc. | Riverside | WA | Subcontractor |
| Tech Met Inc. | Glassport | PA | Subcontractor |
| Technical Machining Services, Inc. | Oak Ridge | TN | $0 |
| Technical Products Inc. | West Bend | WI | $0 |
| Technics 2000, Inc. | Olathe | KS | Subcontractor |
| Tec, Inc. | Frederick | MD | Subcontractor |
| Tecma Inc. | Sacramento | CA | Subcontractor |
| Tecomet Inc. | Azusa | CA | Subcontractor |
| Ted Davis Enterprises, Inc. | Oklahoma City | OK | $0 |
| Teknoyaman Makina Optik Kimya Sanayi Ve Ticaret Limited Sirketi | Ankara | | $0 |
| Tektonics Design Group LLC | Richmond | VA | $0 |
| Teltron Engineering, Inc. | Taunton | MA | Subcontractor |
| Temco Tool Company, Inc. | Manchester | NH | Subcontractor |
| Tempco Engineering Inc. | Sun Valley | CA | Subcontractor |
| Tennessee Tool And Engineering, Inc. | Oak Ridge | TN | Subcontractor |
| Tennessee Tool Works LLC | Murfreesboro | TN | Subcontractor |
| T & F Sheet Metals Fab And Machining, Inc. | Gardena | CA | Subcontractor |
| Thaler Machine Company, LLC | Springboro | OH | Subcontractor |
| The Custom Group, Inc. | Woburn | MA | Subcontractor |
| The Flinchbaugh Company, Inc. | Manchester | PA | Subcontractor |
| Theonics Inc. | Huntsville | AL | Subcontractor |
| The Rembar Company LLC | Dobbs Ferry | NY | Subcontractor |
| The Toolroom, Inc. | Owensville | MO | Subcontractor |
| Thiessen Products,inc. | Camarillo | CA | $0 |
| Thomas W Springer Inc. | Landenberg | PA | $0 |
| Thompson Precision Inc. | Kalispell | MT | Subcontractor |
| Tis Aerospace LLC | Cinnaminson | NJ | Subcontractor |
| T K Innovation, Inc. | Wheeling | WV | Subcontractor |
