| Business | Phone |
| Action Precision 1551 Seminole St, San Marcos 92078 | (760) 744-3141 |
| All Precision Engineering 1365 Grand Ave # 104, San Marcos 92078 | (760) 471-8792 |
| Arc Technologies 185 Vallecitos De Oro, San Marcos 92069 | (760) 744-7400 |
| B & H Tool Co 285 Pawnee St # D, San Marcos 92078 | (760) 471-8949 |
| Barrel Service Co 105 S Pacific St, San Marcos 92078 | (760) 744-2122 |
| Butler Machining & Design 137 N Pacific St, San Marcos 92069 | (760) 744-1127 |
| A J Mold 1046 Commerce St # H, San Marcos 92078 | (760) 752-7744 |
| Slivnik Machining Inc 1070 Linda Vista Dr, San Marcos 92078 | (760) 744-8692 |
| Sanders Welding & Sandblasting 1323 Armorlite Dr, San Marcos 92069 | (760) 744-3191 |
| Rush Precision Machine 2930 Norman Strasse Rd # 114, San Marcos 92069 | (760) 598-5152 |
| R-5 Design 920 Rancheros Dr # C, San Marcos 92069 | (760) 740-0120 |
| Ram Tech Manufacturer 2910 Norman Strasse Rd # 107, San Marcos 92069 | (760) 727-3730 |
| Psn Machine 575 N Twin Oaks Valley Rd # C, San Marcos 92069 | (760) 510-3826 |
| Precision Crafted Screw Prods 900 Los Vallecitos Blvd # G, San Marcos 92069 | (760) 736-4405 |
| Cornerstone Cnc Machining 1449 Alpine Pl, San Marcos 92078 | (760) 761-3660 |
| Dale Tenney Enterprises 382 Enterprise St, San Marcos 92078 | (760) 736-0004 |
| North County Screw Machine 430 Cribbage Ln # B, San Marcos 92078 | (760) 744-5252 |
| Mercury Tool & Die Corp 131 Venture St, San Marcos 92078 | (760) 591-4595 |
| Gerland Machine Inc 120 N Pacific St, San Marcos 92069 | (760) 744-0821 |
| Gilbert Machine 1265 Stone Dr, San Marcos 92078 | (760) 744-4047 |
| Gpm Engineering 571 N Twin Oaks Valley Rd # D, San Marcos 92069 | (760) 591-3676 |
| Ly Machine Shop 972 Rancheros Dr, San Marcos 92069 | (760) 741-2219 |
| Ly's Precision Machining 546 S Pacific St, San Marcos 92078 | (760) 744-6115 |
| Hi-Tech Manufacturer 888 Rancheros Dr # E, San Marcos 92069 | (760) 839-6612 |
| K Manufacturing 197 S Twin Oaks Valley Rd, San Marcos 92078 | (760) 471-1011 |
| L & S Machine 228 Venture St # 101, San Marcos 92078 | (760) 744-7807 |
| K-Tech Machine 1377 Armorlite Dr, San Marcos 92069 | (760) 471-9262 |
| Kevin's Kustom Machine San Marcos 92078 | (760) 505-4379 |