| Business | Phone |
| 99 Precision Tools 1165 E Acacia Ct # A, Ontario 91761 | (909) 947-3667 |
| Accufab 1514 E Francis St, Ontario 91761 | (909) 930-1751 |
| Acra Machining 1620 S Carlos Ave # H, Ontario 91761 | (909) 923-2112 |
| Akron Engineering & Machining 1225 S Bon View Ave, Ontario 91761 | (909) 923-8875 |
| All Time Machine Ontario 91761 | (909) 673-1899 |
| Allied Mechanical Products 1720 S Bon View Ave, Ontario 91761 | (909) 947-2723 |
| Am Ova Ontario 91761 | (909) 605-6959 |
| Am Tek Engineering 2115 S Hellman Ave, Ontario 91761 | (909) 673-1633 |
| Angeles Precision Products 1721 S Vineyard Ave, Ontario 91761 | (909) 673-0090 |
| Apc Machine Inc 1942 S Augusta Ave # C, Ontario 91761 | (909) 930-1222 |
| B & T Automatics 10755 Grand Ave, Ontario 91762 | (909) 628-4108 |
| Bae Systems 1930 S Vineyard Ave, Ontario 91761 | (909) 947-7600 |
| Bock Machine Co Inc 1911 S Lake Pl, Ontario 91761 | (909) 947-7250 |
| C & H Manufacturer Inc 4280 E Lowell St, Ontario 91761 | (909) 930-0088 |
| C & N Machinery 181 S Wineville Ave # D, Ontario 91761 | (909) 974-1196 |
| C S Jig Grinding 1614 S Carlos Ave, Ontario 91761 | (909) 673-1055 |
| California Rebuilt Exchange 1326 Brooks St, Ontario 91762 | (909) 983-2244 |
| Compart Corp 1898 S Carlos Ave, Ontario 91761 | (909) 591-6546 |
| D & J Industries 2124 S Grove Ave, Ontario 91761 | (909) 773-0111 |
| D & N Machine Co 1721 S Vineyard Ave # P, Ontario 91761 | (909) 930-9988 |
| Datum One Engineering 2125 S Hellman Ave, Ontario 91761 | (909) 923-8995 |
| Demco Machine 1457 E Philadelphia St, Ontario 91761 | (909) 930-1622 |
| Graves Automotive Supply 645 W Holt Blvd, Ontario 91762 | (909) 984-2401 |
| H M Quality Machinging 1614 S Carlos Ave # J, Ontario 91761 | (909) 930-2404 |
| Isidoro Tool Grinding 1364 S Parkside Pl, Ontario 91761 | (909) 947-1545 |
| J & J Tool Specialties 1473 E Philadelphia St, Ontario 91761 | (909) 930-0325 |
| J R Machine Shop 1131 Brooks St, Ontario 91762 | (909) 391-2201 |
| Jcm Engineering 2690 E Cedar St, Ontario 91761 | (909) 923-3730 |
| Jim Burkey Tool 1225 S Bon View Ave, Ontario 91761 | (909) 947-6558 |
| Johnson's Tooling & Machining 1045 W Bonnie Brae Ct, Ontario 91762 | (909) 988-5544 |
| K & K Forge Die Inc 1514 E Francis St # A, Ontario 91761 | (909) 930-2577 |
| Keeley Aerospace 2131 S Hellman Ave # R, Ontario 91761 | (909) 930-9645 |
| Koam Machine 915 Brooks St # 102, Ontario 91762 | (909) 988-6661 |
| Kuder Engineering Inc 2155 S Cucamonga Ave, Ontario 91761 | (909) 947-4103 |
| Lamb Engineering Inc 1630 E Francis St # P, Ontario 91761 | (909) 947-5745 |
| Los Angeles Cylinder Head 949 W State St # J, Ontario 91762 | (909) 460-9965 |
| Marlee Manufacturing 4711 E Guasti Rd, Ontario 91761 | (909) 390-3222 |
| Mc Motorsports Llc 2101 S Hellman Ave, Ontario 91761 | (909) 947-5115 |
| Nbt Machining Inc 1508 E Francis St # A-B, Ontario 91761 | (909) 673-0571 |
| Ncmi-Brueggemann Inc 1207 Brooks St, Ontario 91762 | (909) 986-1933 |
| Elite Machining Co 759 E Francis St, Ontario 91761 | (909) 923-4381 |
| Elmore Products 1227 Brooks St # I, Ontario 91762 | (909) 988-0083 |
| Emsco Precision 1711 S Grove Ave # D, Ontario 91761 | (909) 923-2504 |
| G & J Machine Co 10756 Vernon Ave, Ontario 91762 | (909) 591-7333 |
| Industrial Machining Co 1219 S Bon View Ave, Ontario 91761 | (909) 923-9939 |
| Nozzel Machine Seals 629 E Wisteria Ct, Ontario 91761 | (909) 467-5609 |
| Ogaz Enterprises Inc 1225 S Bon View Ave, Ontario 91761 | (909) 923-5311 |
| Ojeda's Machine Shop 534 S Mountain Ave # J, Ontario 91762 | (909) 988-1141 |
| Pac Zonamatic Inc 1139 W State St, Ontario 91762 | (909) 988-1155 |
| Palo Inc 4747 W State St # M, Ontario 91762 | (909) 464-1959 |
| Parts Inc 1942 S Augusta Ave # A, Ontario 91761 | (909) 947-4833 |
| Pena's Machining 2125 S Hellman Ave # J, Ontario 91761 | (909) 930-9530 |
| Pmc Machine 2049 S Hellman Ave, Ontario 91761 | (909) 923-6669 |
| Precision Lathe Works 1445 Brooks St # B, Ontario 91762 | (909) 395-9030 |
| Primos Cylinder Head 416 S Bon View Ave, Ontario 91761 | (909) 986-6433 |
| R & R Machine 2124 S Grove Ave, Ontario 91761 | (909) 947-6626 |
| R J Industries 1961 S Baker Ave, Ontario 91761 | (909) 673-1880 |
| Skytek Manufacturer Co 5638 W Mission Blvd, Ontario 91762 | (909) 988-8200 |
| South Precision 1440 Brooks St # 1, Ontario 91762 | (909) 988-4343 |
| Summit Machine Inc 1701 E Monticello Ct, Ontario 91761 | (909) 923-2744 |
| Temecula Precision Mach Work 2128 S Grove Ave # K, Ontario 91761 | (909) 930-9485 |
| V & M Manufacturer 1620 S Carlos Ave, Ontario 91761 | (909) 930-3791 |
| V & P Engineering 606 S Hope Ave, Ontario 91761 | (909) 986-3229 |
| Watson's Profiling Corp 1460 S Balboa Ave, Ontario 91761 | (909) 923-5500 |
| Y S De Leon Machine 2313 E Philadelphia St, Ontario 91761 | (909) 923-0155 |
| Magcnc Swiss Turning 1457 E Philadelphia St, Ontario 91761 | (909) 923-2470 |