| Business | Phone |
| A-Classic Steel Treating Inc 9106 Madison Ave, Cleveland 44102 | (216) 651-0300 |
| Advanced Flame Hardening 8401 Almira Ave, Cleveland 44102 | (216) 651-2058 |
| Amac Enterprises Inc 5909 W 130th St, Cleveland 44130 | (216) 362-1880 |
| American Metal Treating Co 1043 E 62nd St, Cleveland 44103 | (216) 431-4492 |
| Bodycote Shore Inc 5475 Avion Park Dr, Cleveland 44143 | (440) 473-2020 |
| Bodycote Thermal Processing 14701 Industrial Ave, Cleveland 44137 | (216) 475-0400 |
| Bristal Metal Products Inc 27070 Detroit Rd # 108, Cleveland 44145 | (440) 835-0657 |
| Walker Heat Treating Inc 10601 Briggs Rd, Cleveland 44111 | (216) 941-0440 |
| Commercial Forge & Heat Treat 3714 E 93rd St, Cleveland 44105 | (216) 883-1926 |
| Commercial Induction 11116 Avon Ave, Cleveland 44105 | (216) 883-4820 |
| Universal Heat Treating Inc 3878 E 93rd St, Cleveland 44105 | (216) 641-2000 |
| Usa Heat Treating Inc 4500 Lee Rd, Cleveland 44128 | (216) 587-4700 |
| Euclid Heat Treating Co 1408 E 222nd St, Cleveland 44117 | (216) 481-8444 |
| General Metal Heat Treating 941 Addison Rd, Cleveland 44103 | (216) 391-0886 |
| George H Porter Steel Treating 1273 E 55th St, Cleveland 44103 | (216) 431-6601 |
| Harvard Metal Treating Inc 2817 Harvard Ave, Cleveland 44105 | (216) 271-4424 |
| Prince & Izant Co 12999 Plaza Dr, Cleveland 44130 | (216) 362-7000 |
| Hydro-Vac 1177 Marquette St, Cleveland 44114 | (216) 881-1656 |
| Kowalski Heat Treating Co 3611 Detroit Ave, Cleveland 44113 | (216) 631-4411 |
| Non-Ferrous Heat Treating Inc 14450 Industrial Ave N, Cleveland 44137 | (216) 662-0800 |
| M-R Equipment Corp 23611 Chagrin Blvd, Cleveland 44122 | (216) 292-3400 |
| Middle States Oil Co 9201 Roanoke Ct, Cleveland 44133 | (440) 237-0570 |