Good Morning James, That is a wonderful question, and yes we do have 5/8 steel rods, but in a variety of lengths. Here is a link to our page https://www.agrisupply.com/steel-angles-flats-rounds/c/5900029/ if you have any other questions please feel free to reach out, thanks. Agri Supply Greenville
Good Morning James. We do carry 5/8" unthreaded rod. https://www.agrisupply.com/unthreaded-rods-steel/p/23499/
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