If you are manufacturing parts, search for C110 (Electrolytic Tough Pitch) for high conductivity or C122 for specialized applications like stills.
Home Depot and Lowe's typically stock standard 8-foot grounding rods and smaller hobbyist lengths. buy copper rod online
For bulk or very long bars (16-18ft), you may need to contact industrial distributors directly via platforms like Thomasnet . 3. Key Considerations If you are manufacturing parts, search for C110