| 99 PRECISION TOOLS | 1165 E ACACIA CT ONTARIO, CA | (909) 947-3667 |
| ACCUFAB | 1516 E FRANCIS ST ONTARIO, CA | (909) 930-1751 |
| AERO MACHINING COMPANY | 1364 S PARKSIDE DR ONTARIO, CA | (714) 638-8364 |
| AKRON ENGINEERING & MACHINING | 1225 S BON VIEW AVE ONTARIO, CA | (909) 923-8875 |
| AM-TEK ENGINEERING | 2115 S HELLMAN AVE ONTARIO, CA | (909) 673-1633 |
| ANGELES PRECISION PRODUCTS | 1721 S VINEYARD AVE ONTARIO, CA | (909) 673-0090 |
| BOCK MACHINE CO INC | 1911 S LAKE PL ONTARIO, CA | (909) 947-7250 |
| BURKEY JIM TOOL | 1225 S BON VIEW AVE ONTARIO, CA | (909) 947-6558 |
| C & H INC | 4280 E LOWELL ST ONTARIO, CA | (909) 930-0088 |
| CAL PRECISION INCORPORATED | 1460 S BALBOA AVE ONTARIO, CA | (909) 923-9766 |
| CHUCKMASTER CO | 1227 BROOKS ST ONTARIO, CA | (909) 983-5680 |
| D & J INDUSTRIES | 2124 S GROVE AVE ONTARIO, CA | (909) 773-0111 |
| DADDATO INDUSTRIES | 1930 S BON VIEW AVE ONTARIO, CA | (909) 947-3301 |
| DIAZ TOOL GRINDING | 151 S WINEVILLE AVE ONTARIO, CA | (909) 390-8538 |
| DREAMS R US | 1131 BROOKS ST ONTARIO, CA | (909) 395-8883 |
| EARL MFG CO INC | 304 ARMSLEY SQ ONTARIO, CA | (562) 945-2971 |
| EDCO TOOL & DIE | 1942 S AUGUSTA AVE ONTARIO, CA | (909) 947-7366 |
| ELMORE PRODUCTS INC | 1227 BROOKS ST ONTARIO, CA | (909) 988-0083 |
| FARRAR AEROSPACE | ONTARIO, CA | (909) 983-5909 |
| G & J MACHINE CO | 10756 VERNON AVE ONTARIO, CA | (909) 590-7333 |
| GRAY MACHINE COMPANY | 1305 S WANAMAKER AVE ONTARIO, CA | (909) 390-2745 |
| J & B MACHINE SHOP & SUPPLY | 969 W STATE ST ONTARIO, CA | (909) 391-5766 |
| J C M ENGINEERING | 1480 S CARLOS AVE ONTARIO, CA | (909) 923-3730 |
| JOLA MANUFACTURING | 1615 E FREMNT CT ONTARIO, CA | (909) 947-6355 |
| KO AM MACHINE | 915 BROOKS ST ONTARIO, CA | (909) 988-6661 |
| LAMB ENGINEERING | ONTARIO, CA | (909) 947-5745 |
| LOS ANGELES CYLINDER HEAD | 949 W STATE ST ONTARIO, CA | (909) 460-9965 |
| MAG CNC SWISS TURNING | 1457 E PHILADELPHIA ST ONTARIO, CA | (909) 923-2470 |
| MC MOTORSPORTS | 2101 S HELLMAN AVE ONTARIO, CA | (909) 947-5115 |
| MCGAREC GEAR & MACHINE INC | 1242 BROOKS ST ONTARIO, CA | (909) 391-8417 |
| MILL-PRO | 1524 E FRANCIS ST ONTARIO, CA | (909) 923-4473 |
| NCMI-BRUEGGEMANN INC | 1207 BROOKS ST ONTARIO, CA | (909) 986-1933 |
| OJEDA'S MACHINE SHOP | 534 S MOUNTAIN AVE ONTARIO, CA | (909) 988-1141 |
| PDQ WELDING & MACHINING | 1365 BROOKS ST ONTARIO, CA | (909) 983-7894 |
| PMC MACHINE | 2049 S HELLMAN AVE ONTARIO, CA | (909) 923-6669 |
| PRIMOS CYLINDER HEAD | 416 S BON VIEW AVE ONTARIO, CA | (909) 986-6433 |
| R & R MACHINE | 2124 S GROVE AVE ONTARIO, CA | (909) 947-6626 |
| REVCO | 535 MAGNOLIA AVE ONTARIO, CA | (909) 395-9350 |
| SULLIVAN MACHINE PRODUCTS | 701 AUTO CENTER DR ONTARIO, CA | (909) 390-1061 |
| V & M MANUFACTORY | 969 W STATE ST ONTARIO, CA | (909) 391-6261 |
| W D C MANUFACTURING | 2141 E PHILADELPHIA ST ONTARIO, CA | (909) 930-1858 |
| YS DE LEON MACHINE | 1473 E PHILADELPHIA ST ONTARIO, CA | (909) 923-0155 |